MatSci 224 Magnetism and Magnetic. November 5, 2003
|
|
- Scarlett Boyd
- 6 years ago
- Views:
Transcription
1 MatSci 224 Magnetism and Magnetic Materials November 5, 2003
2 How small is small? What determines whether a magnetic structure is made of up a single domain or many domains? d Single domain d~l d d >> l Magnetization could also be non-uniform within a domain Multi-domain Characteristic length scales Exchange length- over which magnetic moments are parallel l = A /M s where A= exchange constant, M s = saturation magnetization Domain wall widthd = π (A/K) where K= anisotropy constant
3 Review of Fundamentals: Energies Magnetostatic associated with magnetization in its own self-field potential energy/volume of magnetization M in an external field B: u = -M B potential energy/volume of magnetization M in its own self field H d : u = -(µ o /2)M H d = (µ o /2)NM 2 Exchange associated with QM interactions (Pauli s exclusion principle) among atomic moments Anisotropy associated with tendency for the magnetic moments to align in certain directions due to crystal symmetry, stress, etc.
4 Magnetostatic Energy a.k.a. demagnetization or dipolar energy Potential energy m 0 Ú - M. H 2 V d dv m 0 Ú 2 = - M. NH ddv 2 V N d = 1/3 Minimizing magnetostatic energy by forming domains M M N d ~ 0 N d ~ 1
5 Exchange Energy Direct exchange real overlap of orbitals of atoms a and b a usually not applicable (eg 4f) (even for 3d, for which itinerant nature more important) Indirect super exchange via non-magnetic atom dominant exchange for many insulators (MnF 2 ) exchange mediated by non-magnetic atom a calculate energy for different possible combinations of orbitals (similar idea to model calc n but much more complex) J can be + or depending on orbital overlap Indirect RKKY exchange magnetic atom polarizes conduction electrons J RKKY ~ {cos(2k F r)} / r 3 a oscillatory (period depends on k F ) J can be + or depending on distance between magnetic atoms b b b
6 Anisotropy Energy Energy associated with rotating magnetic moment in the desired direction Possible origins of anisotropy shape (demagnetization energy) crystal structure-> crystal field effects, spin-orbit coupling strain -> spin-orbit coupling
7 Vortices in NiFe Elements 5nm 0.8µm diameter NiFe elements under increasing and decreasing magnetic fields Single and two vortex states observed Reduction of magnetostatic energy in vortex state 10nm 20nm 50nm Pokhil et al. JAP (00)
8 Magnetic Islands on Templates Vortex state with 90 Neel walls with in-plane domains No in-plane anisotropy for FeCo Perpendicular single domains Perp anisotropy for Co/Pt multilayers 0.4µm AFM and MFM of FeCo on 400nm square dots No direct exchange effect due to sidewall deposits 0.8µm MFM of Co/Pt multilayers on 200nm square dots (200nm apart and 47 nm high)
9 Magnetic Dots on Nanoimprinted Structures Feature sizes from 30 to 400nm and periodicities from 60 to 500nm (d is on the order of l) Co/Pt multilayers deposited on nanoimprinted silicon templates direct exchange between dots via deposits on the sidewalls of the dots SEM of 60nm Ni dots in a 80nm periodicity array MFM of 60nm Ni Dots are single domain Moritz et al. JAP (02)
10 Single Domain Dots 80x140x(14-30)nm Co rectangles In-plane single domains for t<20nm Double domain configuration in t~30nm Dipolar interactions among islands in densely packed arrays Evoy et al. JAP (00)
11 Single Crystalline Submicron Co Dots Perpendicular anisotropy of Co dots 0.5µm diameter and 25-50nm thick In 25nm thick dots, the main component of magnetization is in-plane along with a small concentric ring structure of the perpendicular component Hehn et al. Science (96)
12 Competing Anisotropies Rectangular and needle-shaped ends of (110) 50nm thick Fe exhibit different reversal behavior due to competing magnetic anisotropies: shape, crystal and strain E anis = (K 1 + K u )sin 2 q - 3K 1 /4 sin 4 q + MFM of rectangular Fe elements at H=0 after longitudinal saturation 2 - M. NH 2 where q is the angle between the magnetization and [001] and K 1 and K u are the magnetocrystalline and uniaxial strain anisotropies respectively Yu et al. JAP (99) m 0 Ú V d dv
13 Competing Anisotropies c) d) a) b) MFM of rectangular Fe elements at H=0 after longitudinal (a,c) and transverse (b,d) saturation When magnetic easy axis is perpendicular to the long axis of the structure, a stripe domain configuration minimizes the free energy. When ratio of anisotropy to demagnetization energy Q = K/2πM 2 <1, then flux closure domains at H=0 are also favored. Nucleation barriers to overcome for the formation of stripes.
14 Competing Energies Ratio of anisotropy to demagnetization energy Q=K/2πM s 2 determines whether we should expect closure domains. Q<<1 Q>1 Exchange thickness ( A/M s ) dictates that the surface domain structure (as observed by MFM) is a good measure of most of the film thickness.
15 Competing Energies continued E domain E anisotropy E = s w [2 2+(t-d)/d] + r a d/2 t E min = (2 2-1)s w +(2s w tr a ) 1/2 d s w = surface energy density of Bloch wall r a = anisotropy energy density E magnetic E domain E = 1.7M s 2 d + s w t/d E min = 2(1.7s w t) 1/2 M s t > d E anisotropy E = r a t Kittel, Phys. Rev (46)
16 Magnetic Islands of Colossal Magnetoresistance Materials Magnetization H topographic and magnetic images of La 0.7 Sr 0.3 MnO 3 islands H Field (Oe) Magnetization loops show the effect of shape on the magnetic response. 4 3 Wu, Matsushita & Suzuki PRB 64 R (2001)
17 Magnetization Reversal of LSMO/LAO Islands Under a -450 Oe field x - perpendicular to the film. Under a 450 Oe field. perpendicular to the film. Wu et al. PRB 64 R (01)
18 Thickness Dependence of CMR Islands 70 nm high 90 nm high Wu et al. PRB 64 R (01)
19 Aspect Ratio: Aspect Ratio and Domain Structures mm 1mm 1mm Magnetic Force Microscopy images of LSMO dots Wu and Suzuki
Magnetic Force Microscopy practical
European School on Magnetism 2015 From basic magnetic concepts to spin currents Magnetic Force Microscopy practical Organized by: Yann Perrin, Michal Staňo and Olivier Fruchart Institut NEEL (CNRS & Univ.
More informationMagnetoresistance due to Domain Walls in Micron Scale Fe Wires. with Stripe Domains arxiv:cond-mat/ v1 [cond-mat.mes-hall] 9 Mar 1998.
Magnetoresistance due to Domain Walls in Micron Scale Fe Wires with Stripe Domains arxiv:cond-mat/9803101v1 [cond-mat.mes-hall] 9 Mar 1998 A. D. Kent a, U. Ruediger a, J. Yu a, S. Zhang a, P. M. Levy a
More informationJ 12 J 23 J 34. Driving forces in the nano-magnetism world. Intra-atomic exchange, electron correlation effects: Inter-atomic exchange: MAGNETIC ORDER
Driving forces in the nano-magnetism world Intra-atomic exchange, electron correlation effects: LOCAL (ATOMIC) MAGNETIC MOMENTS m d or f electrons Inter-atomic exchange: MAGNETIC ORDER H exc J S S i j
More informationLuigi Paolasini
Luigi Paolasini paolasini@esrf.fr LECTURE 4: MAGNETIC INTERACTIONS - Dipole vs exchange magnetic interactions. - Direct and indirect exchange interactions. - Anisotropic exchange interactions. - Interplay
More informationMagnetism in Condensed Matter
Magnetism in Condensed Matter STEPHEN BLUNDELL Department of Physics University of Oxford OXFORD 'UNIVERSITY PRESS Contents 1 Introduction 1.1 Magnetic moments 1 1 1.1.1 Magnetic moments and angular momentum
More informationMacroscopic properties II
Paolo Allia DISAT Politecnico di Torino acroscopic properties II acroscopic properties II Crucial aspects of macroscopic ferromagnetism Crystalline magnetic anisotropy Shape anisotropy Ferromagnetic domains
More informationMagnetic domain theory in dynamics
Chapter 3 Magnetic domain theory in dynamics Microscale magnetization reversal dynamics is one of the hot issues, because of a great demand for fast response and high density data storage devices, for
More informationLecture 5. Chapters 3 & 4. Induced magnetization: that which is induced in the presence of an applied magnetic field. diamagnetic.
Lecture 5 Induced magnetization: that which is induced in the presence of an applied magnetic field diamagnetic paramagnetic Remanent magnetization: that which remains in the absence of an external field
More informationIntroduction to magnetism of confined systems
Introduction to magnetism of confined systems P. Vavassori CIC nanogune Consolider, San Sebastian, Spain; nano@nanogune.eu Basics: diamagnetism and paramagnetism Every material which is put in a magnetic
More informationMaking the Invisible Visible: Probing Antiferromagnetic Order in Novel Materials
Making the Invisible Visible: Probing Antiferromagnetic Order in Novel Materials Elke Arenholz Lawrence Berkeley National Laboratory Antiferromagnetic contrast in X-ray absorption Ni in NiO Neel Temperature
More informationTechniques for inferring M at small scales
Magnetism and small scales We ve seen that ferromagnetic materials can be very complicated even in bulk specimens (e.g. crystallographic anisotropies, shape anisotropies, local field effects, domains).
More informationThe Physics of Ferromagnetism
Terunobu Miyazaki Hanmin Jin The Physics of Ferromagnetism Springer Contents Part I Foundation of Magnetism 1 Basis of Magnetism 3 1.1 Basic Magnetic Laws and Magnetic Quantities 3 1.1.1 Basic Laws of
More informationInfluence of Size on the Properties of Materials
Influence of Size on the Properties of Materials M. J. O Shea Kansas State University mjoshea@phys.ksu.edu If you cannot get the papers connected to this work, please e-mail me for a copy 1. General Introduction
More information复习题. 2 Calculate the intensity of magnetic field in the air gap of the magnetic circuit shown in the figure. Use the values N=200,
复习题 1 Calculate the magnetic moment of a sphere of radius R made from a magnetic material with magnetic susceptibility, when it is magnetized by an external magnetic field H. How is the value of the moment
More informationSupplementary Figure 1 Representative sample of DW spin textures in a
Supplementary Figure 1 Representative sample of DW spin textures in a Fe/Ni/W(110) film. (a) to (d) Compound SPLEEM images of the Fe/Ni/W(110) sample. As in Fig. 2 in the main text, Fe thickness is 1.5
More informationSEEING Phase Transitions with. Magnetic Force Microscopy. Dept. of Physics, University of Texas at Austin. Alex de Lozanne
SEEING Phase Transitions with Magnetic Force Microscopy Alex de Lozanne Dept. of Physics, University of Texas at Austin LOZANNE@PHYSICS.UTEXAS.EDU Defense: Mon Dec. 5, 10am, 14.218 CURRENT GROUP: Dr.Weida
More informationAngular dependence of the magnetization reversal in exchange biased Fe/MnF 2. Elke Arenholz
Angular dependence of the magnetization reversal in exchange biased Fe/MnF 2 Elke Arenholz Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 Kai Liu Department of Physics,
More informationDirect study of domain and domain wall structure in magnetic films and nanostructures
Direct study of domain and domain wall structure in magnetic films and nanostructures John Chapman, University of Glasgow Synopsis Why use Lorentz microscopy? Magnetisation reversal in soft magnetic films
More informationSimulation of Hysteresis In Permalloy Films
GQ-02 1 Simulation of Hysteresis In Permalloy Films Andrew Kunz and Chuck Campbell Magnetic Microscopy Center University of Minnesota Minneapolis, MN Introduction 2 Looking for the classical behavior of
More informationThe Quantum Theory of Magnetism
The Quantum Theory of Magnetism Norberto Mains McGill University, Canada I: 0 World Scientific Singapore NewJersey London Hong Kong Contents 1 Paramagnetism 1.1 Introduction 1.2 Quantum mechanics of atoms
More informationContents. Acknowledgments
MAGNETIC MATERIALS Fundamentals and Applications Second edition NICOLA A. SPALDIN University of California, Santa Barbara CAMBRIDGE UNIVERSITY PRESS Contents Acknowledgments page xiii I Basics 1 Review
More informationSkyrmions in symmetric bilayers
Skyrmions in symmetric bilayers A. Hrabec, J. Sampaio, J.Miltat, A.Thiaville, S. Rohart Lab. Physique des Solides, Univ. Paris-Sud, CNRS, 91405 Orsay, France I. Gross, W. Akhtar, V. Jacques Lab. Charles
More informationAn investigation of magnetic reversal in submicron-scale Co dots using first order reversal curve diagrams
JOURNAL OF APPLIED PHYSICS VOLUME 85, NUMBER 9 1 MAY 1999 An investigation of magnetic reversal in submicron-scale Co dots using first order reversal curve diagrams Chris Pike a) Department of Geology,
More informationFerromagnetism and Electronic Transport. Ordinary magnetoresistance (OMR)
Ferromagnetism and Electronic Transport There are a number of effects that couple magnetization to electrical resistance. These include: Ordinary magnetoresistance (OMR) Anisotropic magnetoresistance (AMR)
More informationSelf-organized growth on the Au(111) surface
Self-organized growth on the Au(111) surface Olivier Fruchart 02/03/2002 Olivier Fruchart - Laboratoire Louis Néel, Grenoble, France. Slides on-line: http://lab-neel.grenoble.cnrs.fr/themes/couches/ext/
More informationJ 12 J 23 J 34. Driving forces in the nano-magnetism world. Intra-atomic exchange, electron correlation effects: Inter-atomic exchange: MAGNETIC ORDER
Driving forces in the nano-magnetism world Intra-atomic exchange, electron correlation effects: LOCAL (ATOMIC) MAGNETIC MOMENTS m d or f electrons Inter-atomic exchange: MAGNETIC ORDER H exc J S S i j
More informationMagnetization reversal of microstructured kagome lattices
Magnetization reversal of microstructured kagome lattices A. Westphalen, A. Schumann, A. Remhof, and H. Zabel* Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
More informationUniversity of Antwerp Condensed Matter Theory Group Vortices in superconductors IV. Hybrid systems
Vortices in superconductors IV. Hybrid systems François Peeters Magnetic impurities T c decreases with increasing impurity density Origin: exchange interaction between electron and impurity: Γ(r i -r e
More informationChapter 2. Theoretical background. 2.1 Itinerant ferromagnets and antiferromagnets
Chapter 2 Theoretical background The first part of this chapter gives an overview of the main static magnetic behavior of itinerant ferromagnetic and antiferromagnetic materials. The formation of the magnetic
More informationTheory of magnetoelastic dissipation due to domain wall width oscillation
JOURNAL OF APPLIED PHYSICS VOLUME 83, NUMBER 11 1 JUNE 1998 Theory of magnetoelastic dissipation due to domain wall width oscillation Y. Liu and P. Grütter a) Centre for the Physics of Materials, Department
More informationLuigi Paolasini
Luigi Paolasini paolasini@esrf.fr LECTURE 5: MAGNETIC STRUCTURES - Mean field theory and magnetic order - Classification of magnetic structures - Collinear and non-collinear magnetic structures. - Magnetic
More informationOSCILLATORY THICKNESS DEPENDENCE OF THE COERCIVE FIELD IN MAGNETIC 3D ANTI-DOT ARRAYS
1 OSCILLATORY THICKNESS DEPENDENCE OF THE COERCIVE FIELD IN MAGNETIC 3D ANTI-DOT ARRAYS A. A. Zhukov 1, M. A. Ghanem 2, A. V. Goncharov 1, R. Boardman 3, V. Novosad 4, G. Karapetrov 4, H. Fangohr 3, P.
More informationFirst-Principles Calculation of Exchange Interactions
Chapter 2 First-Principles Calculation of Exchange Interactions Before introducing the first-principles methods for the calculation of exchange interactions in magnetic systems we will briefly review two
More informationPhenomenology and Models of Exchange Bias in Core /Shell Nanoparticles
Phenomenology and Models of Exchange Bias in Core /Shell Nanoparticles Xavier Batlle and Amílcar Labarta Departament de Física Fonamental and Institut de Nanociència i Nanotecnologia Universitat de Barcelona,
More informationSupplementary Figure 1: Fitting of the x-ray diffraction data by FULLPROF method. (a) O-LPCMO and (b) R-LPCMO. The orange (red) line is the x-ray
Supplementary Figure 1: Fitting of the x-ray diffraction data by FULLPROF method. (a) O-LPCMO and (b) R-LPCMO. The orange (red) line is the x-ray diffraction data of O-LPCMO (R-LPCMO) and the blue (black)
More informationMagnetic properties of Co nanocolumns fabricated by oblique-angle deposition
JOURNAL OF APPLIED PHYSICS VOLUME 93, NUMBER 7 1 APRIL 2003 Magnetic properties of Co nanocolumns fabricated by oblique-angle deposition F. Tang, a) D.-L. Liu, D.-X. Ye, Y.-P. Zhao, T.-M. Lu, and G.-C.
More informationANGULAR DEPENDENCE OF MAGNETIC PROPERTIES IN Co/Pt MULTILAYERS WITH PERPENDICULAR MAGNETIC ANISOTROPY
International Journal of Modern Physics B Vol. 19, Nos. 15, 16 & 17 (2005) 2562-2567 World Scientific Publishing Company World Scientific V www.worldscientific.com ANGULAR DEPENDENCE OF MAGNETIC PROPERTIES
More informationMAGNETIC MATERIALS. Fundamentals and device applications CAMBRIDGE UNIVERSITY PRESS NICOLA A. SPALDIN
MAGNETIC MATERIALS Fundamentals and device applications NICOLA A. SPALDIN CAMBRIDGE UNIVERSITY PRESS Acknowledgements 1 Review of basic magnetostatics 1.1 Magnetic field 1.1.1 Magnetic poles 1.1.2 Magnetic
More informationLecture contents. Magnetic properties Diamagnetism Band paramagnetism Atomic paramagnetism Ferromagnetism. Molecular field theory Exchange interaction
1 Lecture contents Magnetic properties Diamagnetism and paramagnetism Atomic paramagnetism Ferromagnetism Molecular field theory Exchange interaction NNSE 58 EM Lecture #1 [SI] M magnetization or magnetic
More informationPHY331 Magnetism. Lecture 8
PHY331 Magnetism Lecture 8 Last week. We discussed domain theory of Ferromagnetism. We saw there is a motion of domain walls with applied magnetic field. Stabilization of domain walls due to competition
More informationFoundations of Condensed Matter Physics
Foundations of Condensed Matter Physics PHY1850F 2005 www.physics.utoronto.ca/~wei/phy1850f.html Physics 1850F Foundations of Condensed Matter Physics Webpage: www.physics.utoronto.ca/~wei/phy1850f.html
More informationMagnetic recording technology
Magnetic recording technology The grain (particle) can be described as a single macrospin μ = Σ i μ i 1 0 1 0 1 W~500nm 1 bit = 300 grains All spins in the grain are ferromagnetically aligned B~50nm Exchange
More informationColossal magnetoresistance:
Colossal magnetoresistance: Ram Seshadri (seshadri@mrl.ucsb.edu) The simplest example of magnetoresistance is transverse magnetoresistance associated with the Hall effect: H + + + + + + + + + + E y - -
More informationSome pictures are taken from the UvA-VU Master Course: Advanced Solid State Physics by Anne de Visser (University of Amsterdam), Solid State Course
Some pictures are taken from the UvA-VU Master Course: Advanced Solid State Physics by Anne de Visser (University of Amsterdam), Solid State Course by Mark Jarrel (Cincinnati University), from Ibach and
More informationMagneto Optical Kerr Effect Microscopy Investigation on Permalloy Nanostructures
Magneto Optical Kerr Effect Microscopy Investigation on Permalloy Nanostructures Zulzawawi Bin Haji Hujan A thesis submitted for the degree of MSc by research University of York Department of Physics January
More informationAnisotropy Distributions in Patterned Magnetic Media
MINT Review & Workshop 24-25 Oct. 2006 Anisotropy Distributions in Patterned Magnetic Media Tom Thomson Hitachi San Jose Research Center Page 1 Acknowledgements Manfred Albrecht (Post-doc) Tom Albrecht
More informationMagnetic Materials. The inductor Φ B = LI (Q = CV) = L I = N Φ. Power = VI = LI. Energy = Power dt = LIdI = 1 LI 2 = 1 NΦ B capacitor CV 2
Magnetic Materials The inductor Φ B = LI (Q = CV) Φ B 1 B = L I E = (CGS) t t c t EdS = 1 ( BdS )= 1 Φ V EMF = N Φ B = L I t t c t B c t I V Φ B magnetic flux density V = L (recall I = C for the capacitor)
More informationMagnetic neutron diffraction. Rob McQueeney, Ames Laboratory and Iowa State University
Magnetic neutron diffraction Rob McQueeney, Ames Laboratory and Iowa State University September 19, 2018 Magnetic moment-rare earths Progressive filling of 4f levels Strong Hund s rules Strong spin-orbit
More information9. Spin Torque Majority Gate
eyond MOS computing 9. Spin Torque Majority Gate Dmitri Nikonov Thanks to George ourianoff Dmitri.e.nikonov@intel.com 1 Outline Spin majority gate with in-pane magnetization Spin majority gate with perpendicular
More informationIntroduction to Heisenberg model. Javier Junquera
Introduction to Heisenberg model Javier Junquera Most important reference followed in this lecture Magnetism in Condensed Matter Physics Stephen Blundell Oxford Master Series in Condensed Matter Physics
More informationPerpendicular MTJ stack development for STT MRAM on Endura PVD platform
Perpendicular MTJ stack development for STT MRAM on Endura PVD platform Mahendra Pakala, Silicon Systems Group, AMAT Dec 16 th, 2014 AVS 2014 *All data in presentation is internal Applied generated data
More informationFundamentals of Magnetism
Fundamentals of Magnetism Part II Albrecht Jander Oregon State University Real Magnetic Materials, Bulk Properties M-H Loop M M s M R B-H Loop B B s B R H ci H H c H M S - Saturation magnetization H ci
More informationIntroduction to Ferromagnetism. Depto. Física de Materiales, Facultad de Química, Universidad del País Vasco, San Sebastián, Spain
Introduction to Ferromagnetism and Patterned Magnetic Nanostructures Konstantin Yu. Guslienko Depto. Física de Materiales, Facultad de Química, Universidad id d del País Vasco, San Sebastián, Spain Outline
More informationCurrent-induced Domain Wall Dynamics
Current-induced Domain Wall Dynamics M. Kläui, Fachbereich Physik & Zukunftskolleg Universität Konstanz Konstanz, Germany Starting Independent Researcher Grant Motivation: Physics & Applications Head-to-head
More informationTheory of Spin Diode Effect
Theory of Spin Diode Effect Piotr Ogrodnik Warsaw University of Technology and Institute of Molecular Physics Polish Academy of Sciences NANOSPIN Summarizing Meeting, Kraków, 11-12th July 216 Outline:
More informationccsd , version 1-9 May 2005
Europhysics Letters PREPRINT Flux-closure-domain states and demagnetizing energy determination in sub-micron size magnetic dots P.-O. Jubert 1 ( )( ), J.-C. Toussaint 1, O. Fruchart 1, C. Meyer 1 and Y.
More informationEXPERIMENTAL STUDY OF NANOMAGNETS FOR MAGNETIC QUANTUM- DOT CELLULAR AUTOMATA (MQCA) LOGIC APPLICATIONS. A Dissertation
EXPERIMENTAL STUDY OF NANOMAGNETS FOR MAGNETIC QUANTUM- DOT CELLULAR AUTOMATA (MQCA) LOGIC APPLICATIONS A Dissertation Submitted to the Graduate School of the University of Notre Dame in Partial Fulfillments
More informationImprinting domain/spin configurations in antiferromagnets. A way to tailor hysteresis loops in ferromagnetic-antiferromagnetic systems
Imprinting domain/spin configurations in antiferromagnets A way to tailor hysteresis loops in ferromagnetic-antiferromagnetic systems Dr. J. Sort Institució Catalana de Recerca i Estudis Avançats (ICREA)
More informationTransition from single-domain to vortex state in soft magnetic cylindrical nanodots
Transition from single-domain to vortex state in soft magnetic cylindrical nanodots W. Scholz 1,2, K. Yu. Guslienko 2, V. Novosad 3, D. Suess 1, T. Schrefl 1, R. W. Chantrell 2 and J. Fidler 1 1 Vienna
More informationNanostructure. Materials Growth Characterization Fabrication. More see Waser, chapter 2
Nanostructure Materials Growth Characterization Fabrication More see Waser, chapter 2 Materials growth - deposition deposition gas solid Physical Vapor Deposition Chemical Vapor Deposition Physical Vapor
More informationTHE INFLUENCE OF A SURFACE ON HYSTERESIS LOOPS FOR SINGLE-DOMAIN FERROMAGNETIC NANOPARTICLES
THE INFLUENCE OF A SURFACE ON HYSTERESIS LOOPS FOR SINGLE-DOMAIN FERROMAGNETIC NANOPARTICLES A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science By Saad Alsari
More informationMagnetism. Ram Seshadri MRL 2031, x6129, Some basics:
Magnetism Ram Seshadri MRL 2031, x6129, seshadri@mrl.ucsb.edu Some basics: A magnet is associated with magnetic lines of force, and a north pole and a south pole. he lines of force come out of the north
More informationMicromagnetic simulation of magnetization reversal in rotational magnetic fields
Physica B 306 (2001) 112 116 Micromagnetic simulation of magnetization reversal in rotational magnetic fields J. Fidler*, T. Schrefl, W. Scholz, D. Suess, V.D. Tsiantos Institute of Applied and Technical
More information7. Basics of Magnetization Switching
Beyond CMOS computing 7. Basics of Magnetization Switching Dmitri Nikonov Dmitri.e.nikonov@intel.com 1 Outline Energies in a nanomagnet Precession in a magnetic field Anisotropies in a nanomagnet Hysteresis
More informationThe exchange interaction between FM and AFM materials
Chapter 1 The exchange interaction between FM and AFM materials When the ferromagnetic (FM) materials are contacted with antiferromagnetic (AFM) materials, the magnetic properties of FM materials are drastically
More informationPresentation Groupmeeting June 3 rd, sorry 10 th, 2009 by Jacques Klaasse
Presentation Groupmeeting June 3 rd, sorry 10 th, 2009 by Jacques Klaasse Spin Density Waves This talk is based on a book-chapter on antiferromagnetism, written by Anthony Arrott in Rado-Suhl, Volume IIB,
More informationDomain wall resistance in (Co/Pt) 10 -nanowires
DOI: 10.1209/epl/i2005-10035-1 Domain wall resistance in (Co/Pt) 10 -nanowires B. Leven 1,2,U.Nowak 3,4 and G. Dumpich 1 1 Experimentelle Physik, Universität Duisburg-Essen - 47057 Duisburg, Germany 2
More informationPHYSICS 4750 Physics of Modern Materials Chapter 8: Magnetic Materials
PHYSICS 475 Physics of Modern Materials Chapter 8: Magnetic Materials 1. Atomic Magnetic Dipole Moments A magnetic solid is one in which at least some of the atoms have a permanent magnetic dipole moment
More informationMagnetic ordering, magnetic anisotropy and the mean-field theory
Magnetic ordering, magnetic anisotropy and the mean-field theory Alexandra Kalashnikova kalashnikova@mail.ioffe.ru Ferromagnets Mean-field approximation Curie temperature and critical exponents Magnetic
More informationEnhanced Magnetic Properties of Bit Patterned Magnetic Recording Media by Trench-Filled Nanostructure
CMRR Report Number 32, Summer 2009 Enhanced Magnetic Properties of Bit Patterned Magnetic Recording Media by Trench-Filled Nanostructure Edward Chulmin Choi, Daehoon Hong, Young Oh, Leon Chen, Sy-Hwang
More informationInjecting, Controlling, and Storing Magnetic Domain Walls in Ferromagnetic Nanowires
Marquette University e-publications@marquette Physics Faculty Research and Publications Physics, Department of 8-1-2010 Injecting, Controlling, and Storing Magnetic Domain Walls in Ferromagnetic Nanowires
More informationProbing Magnetic Order with Neutron Scattering
Probing Magnetic Order with Neutron Scattering G.J. Mankey, V.V. Krishnamurthy, F.D. Mackey and I. Zoto University of Alabama in collaboration with J.L. Robertson and M.L. Crow Oak Ridge National Laboratory
More informationExchange bias in core/shell magnetic nanoparticles: experimental results and numerical simulations
Exchange bias in core/shell magnetic nanoparticles: experimental results and numerical simulations Xavier Batlle, A. Labarta, Ò. Iglesias, M. García del Muro and M. Kovylina Goup of Magnetic Nanomaterials
More informationEXCHANGE INTERACTIONS: SUPER-EXCHANGE, DOUBLE EXCHANGE, RKKY; MAGNETIC ORDERS. Tomasz Dietl
Analele Universităţii de Vest din Timişoara Vol. LIII, 2009 Seria Fizică EXCHANGE INTERACTIONS: SUPER-EXCHANGE, DOUBLE EXCHANGE, RKKY; MAGNETIC ORDERS Tomasz Dietl Institute of Physics, Polish Academy
More informationMICROMAGNETICS OF EXCHANGE SPRING MEDIA: OPTIMIZATION AND LIMITS
1/49 MICROMAGNETICS OF EXCHANGE SPRING MEDIA: OPTIMIZATION AND LIMITS Dieter Suess dieter.suess@tuwien.ac.at Institut of Solid State Physics, Vienna University of Technology, Austria (submitted to Journal
More informationCondon domains in the de Haas van Alphen effect. Magnetic domains of non-spin origine
in the de Haas van Alphen effect Magnetic domains of non-spin origine related to orbital quantization Jörg Hinderer, Roman Kramer, Walter Joss Grenoble High Magnetic Field laboratory Ferromagnetic domains
More informationModule-16. Magnetic properties
Module-16 Magnetic properties Contents 1) Dia-, Para-, and Ferro-magnetism (Antiferro-magnetism and ferri-magnetism) 2) Influence of temperature on magnetic behavior 3) Domains and Hysteresis Introduction
More informationSoft X-ray Physics DELNOR-WIGGINS PASS STATE PARK
Soft X-ray Physics Overview of research in Prof. Tonner s group Introduction to synchrotron radiation physics Photoemission spectroscopy: band-mapping and photoelectron diffraction Magnetic spectroscopy
More informationMagnetic Materials. 1. Magnetization 2. Potential and field of a magnetized object
Magnetic Materials 1. Magnetization 2. Potential and field of a magnetized object 3. H-field 4. Susceptibility and permeability 5. Boundary conditions 6. Magnetic field energy and magnetic pressure 1 Magnetic
More informationNeutron Reflectometry of Ferromagnetic Arrays
Neutron Reflectometry of Ferromagnetic Arrays Z.Y. Zhao a, P. Mani a, V.V.Krishnamurthy a, W.-T. Lee b, F. Klose b, and G.J. Mankey a a Center for Materials for Information Technology and Department of
More informationX-Ray Magnetic Circular Dichroism: basic concepts and applications for 3d transition metals. Stefania PIZZINI Laboratoire Louis Néel CNRS- Grenoble
X-Ray Magnetic Circular Dichroism: basic concepts and applications for 3d transition metals Stefania PIZZINI Laboratoire Louis Néel CNRS- Grenoble I) - Basic concepts of XAS and XMCD - XMCD at L 2,3 edges
More informationFabrication and Domain Imaging of Iron Magnetic Nanowire Arrays
Abstract #: 983 Program # MI+NS+TuA9 Fabrication and Domain Imaging of Iron Magnetic Nanowire Arrays D. A. Tulchinsky, M. H. Kelley, J. J. McClelland, R. Gupta, R. J. Celotta National Institute of Standards
More informationChapter 3. Magnetic Model. 3.1 Magnetic interactions
Chapter 3 Magnetic Model In this chapter, the micromagnetic model for the description of the magnetic properties of a laterally nanostructured film during growth is presented. The main physical idea of
More informationExchange interactions
Exchange interactions Tomasz Dietl Institute of Physics, Polish Academy of Sciences, PL-02-668Warszawa, Poland Institute of Theoretical Physics, University of Warsaw, PL-00-681Warszawa, Poland 1. POTENTIAL
More informationHigh T C copper oxide superconductors and CMR:
High T C copper oxide superconductors and CMR: Ram Seshadri (seshadri@mrl.ucsb.edu) The Ruddlesden-Popper phases: Ruddlesden-Popper phases are intergrowths of perovskite slabs with rock salt slabs. First
More informationof Spontaneous and field-induced
Magneto-Optics of Spontaneous and field-induced induced Vortices in twinned YBa 2 Cu 3 O 7-δ /La 1-x Sr x MnO 3 bilayers Superconductivity Group (Politecnico di Torino): Roberto Gerbaldo, Gianluca Ghigo,
More informationarxiv:cond-mat/ v1 9 Jan 2001
arxiv:cond-mat/0101104 v1 9 Jan 2001 Classical and quantum magnetization reversal studied in nanometer-sized particles and clusters Edited by to be published in: Advances in Chemical Physics invitation
More informationSUPPLEMENTARY NOTE 1: ANISOTROPIC MAGNETORESISTANCE PHE-
SUPPLEMENTARY NOTE 1: ANISOTROPIC MAGNETORESISTANCE PHE- NOMENOLOGY In the main text we introduce anisotropic magnetoresistance (AMR) in analogy to ferromagnets where non-crystalline and crystalline contributions
More informationSuperconducting Pinning by Magnetic Domains in a Ferromagnet-Superconductor Bilayer
Vol. 106 (2004) ACTA PHYSICA POLONICA A No. 5 Proceedings of the School Superconductivity and Other Phenomena in Perovskites, Warsaw 2004 Superconducting Pinning by Magnetic Domains in a Ferromagnet-Superconductor
More information490 Index. Heusler alloy 292 Co 2MnSi 292 NiMnSb 292 PtMnSb 292 Hot-electron spin-valve 412
Index AC circuit theory 424 Alloy cobalt-based 286 iron group 278 iron-based 282 nickel-based 285 Anisotropy field 216 Antiferromagnet 287 artificial (AAF) 289 intrinsic properties 289 synthetic (SAF)
More informationPEEM and XPEEM: methodology and applications for dynamic processes
PEEM and XPEEM: methodology and applications for dynamic processes PEEM methods and General considerations Chemical imaging Magnetic imaging XMCD/XMLD Examples Dynamic studies PEEM and XPEEM methods 1
More informationSpin electronics at the nanoscale. Michel Viret Service de Physique de l Etat Condensé CEA Saclay France
Spin electronics at the nanoscale Michel Viret Service de Physique de l Etat Condensé CEA Saclay France Principles of spin electronics: ferromagnetic metals spin accumulation Resistivity of homogeneous
More informationTailoring magnetism in artificially structured materials: the new frontier
Surface Science 500 (2002) 300 322 www.elsevier.com/locate/susc Tailoring magnetism in artificially structured materials: the new frontier J. Shen a, *, J. Kirschner b a Solid State Division, Oak Ridge
More informationFollow this and additional works at: Part of the Physics Commons
Wright State University CORE Scholar Browse all Theses and Dissertations Theses and Dissertations 2016 Surface Effect Of Ferromagnetic Nanoparticles On Transition Between Single- And Multi-Domain Structure
More informationSupplementary Information for. Colloidal Ribbons and Rings from Janus Magnetic Rods
Supplementary Information for Colloidal Ribbons and Rings from Janus Magnetic Rods Jing Yan, Kundan Chaudhary, Sung Chul Bae, Jennifer A. Lewis, and Steve Granick,,, and Department of Materials Science
More informationAn introduction to magnetism in three parts
An introduction to magnetism in three parts Wulf Wulfhekel Physikalisches Institut, Karlsruhe Institute of Technology (KIT) Wolfgang Gaede Str. 1, D-76131 Karlsruhe 0. Overview Chapters of the three lectures
More informationAnisotropic Current-Controlled Magnetization Reversal in the Ferromagnetic Semiconductor (Ga,Mn)As
Anisotropic Current-Controlled Magnetization Reversal in the Ferromagnetic Semiconductor (Ga,Mn)As Yuanyuan Li 1, Y. F. Cao 1, G. N. Wei 1, Yanyong Li 1, Y. i and K. Y. Wang 1,* 1 SKLSM, Institute of Semiconductors,
More informationMaterial Science. Chapter 16. Magnetic properties
Material Science Chapter 16. Magnetic properties Engineering materials are important in everyday life because of their versatile structural properties. Other than these properties, they do play an important
More informationMagnetic imaging of layer-by-layer reversal in Co/ Pt multilayers with perpendicular anisotropy
Magnetic imaging of layer-by-layer reversal in Co/ Pt multilayers with perpendicular anisotropy M. Robinson, Y. Au, J. W. Knepper, F. Y. Yang, and R. Sooryakumar Department of Physics, The Ohio State University,
More informationSPIE - Spintronics San Diego 28 Aug 1 Sep Staffa Island, Scotland
SPIE - Spintronics San Diego 28 Aug 1 Sep 2016 Staffa Island, Scotland O. Fruchart 1. Institut NÉEL, Univ. Grenoble Alpes / CNRS, France 2. SPINTEC, Univ. Grenoble Alpes / CNRS / CEA-INAC, France www.spintec.fr
More information