NANOMAG-LAB Combined study of nanostructured magnetic materials

Transcription

1 Polish network : Magnetism of low dimension structues (in the fram of: Magnetic nanomaterials, MAGE-EL-MAT) IFPAN Warszawa, NANOMAG-LAB Combined study of nanostructured magnetic materials (Marie Curie Host Fellowships for Transfer of Knowledge) LITHUANIA IFMPAN Poznań AGH Kraków FRANCE Paris Hamburg Berlin GERMANY Dresden Prague Kaiserslautern Poznan Ostrava CZECH REPUBLIC Warszawa Bia łystok POLAND Kraków Hrodna BELARUS UKRAINE Minsk Donetsk UwB Białystok HUNGARY Budapest NANOMAG-LAB: Academy of Sciences of the Czech Republic, Institute of Physics; Charles University in Prague; Hahn-Meitner-Institut Berlin; Hungarian Academy of Sciences, Research Institute for Technical Physics & Materials Science (Budapest); Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden; Universität Kaiserslautern; University Paris-Sud; VSB Technical University of Ostrava NANOMAG-LAB supporting partners: Donetsk National University; National Academy of Sciences of Belarus, Institute of Engineering Cybernetics (Minsk); Research Center on Resource Savings of Belarus national academy of sciences (Grodno).

2 Strategy and Methodology 1. Experiment + especial software 2. Theory 3. Knowledge dissimilation and popularization of Science

3 Outline 1. Development of experimental basis: a) AFM/MFM/STM microscope b) Magnetooptical milimagnetometer c) Optical microscopy developed for vectorial analysis; software d) Improved FMR spectrometer, new, home build, VSM 2. Development of theory a) magnetization distributions approaching RPT b) the edge effect in laterally limited nanostructures c) description of magnetoptical effects in nanostructures 3. Results, plans 32 published or accepted for publication papers 38 conferences presentations; 7 invited lectures. Global Web Laboratory - GLOLAB 4. Conclusions

4 1a AFM/MFM/STM Laboratory Scanning Probe Microscope Solver HV+ Ntegra Prima NT-MDT

5 1a AFM μm MFM First results Ultrathin Co sapphire/mo/au/co(d)/au from IFPAN Warsaw d 1.65 nm d 1.70 nm NT-MDT Ntegra d 1.75 nm

6 Ultrathin Co MFM in magnetic field perpendicular 1a to sample plane NT-MDT Ntegra μm Demagnetization by H AC H=50 Oe H=100 Oe H t H=0 Oe

7 1b Magnetooptical set-up The LabView program controls the measurements hysteresis loop and in a real-time visualizes the loop parameters (saturation, remanence, coercive field). x,y LabView controlled sample shift

8 zubr 1c Evolution of magnetic structure analysis in software ZUBR A. Nedzved, W.Dobrogowski 1) Institute of Experimental Physics, University of Bialystok, Poland, poster 2) United Institute of Informatics Problems, National Academy of Sciences of Belarus, Software Zubr is special development for research microscopic image of domain structure Visualization of domain structure is induced by polar Kerr effect. The Carl Zeiss Jenapol optical polarizing microscope (1) with halogen lamp illumination was equipped with a high sensitivity camera (3) having 1300x1030 pixels cooled CCD element and a computer (5) controlled frame grabber (4). Screenshot of software ZUBR Menu Functional Panels Common Common Image Image Processing Processing Input/Output Image improving (+Background correction) Image segmentation Image transformation Interactive analysis Software ZUBR, functions groups Statical analysis Statical analysis of magnetic of magnetic structure structure measurement Blob Needle Dendrite Front object regions Fractal properties Dynamical analysis of sequen- Dynamical analysis of sequence of magnetic ce of magnetic image image arithmetic processing segmentation Dendrites Needles merging automatic interactive Switch for special image window Index of current image Pallet type for image visualization One image One image Menu of program Software ZUBR, processing organization Sequence of merging Sequence of images images Menu of program Zoom image factor Indicator of image processing function Statical analysis Script Statical data storage Sequences operation Dynamical analysis result results result

9 Mo overlayer influence on Co magnetic parameters Remanent image of sample with Mo overlayer poster Z.Kurant Model of alloying of MoCo th 1 0 d Mo [nm] Co model Mo MoCo alloy d Co 2 [nm]

10 Mo overlayer influence on magnetooptical parameters - Kerr ellipticity spatial distribution in the Co-Mo double wedges sample Kerr elipticity z Wedge sample Mo region gold region Au X=Mo,V y Co x 8nm d X d Co 20n m Au 20n m Mo Measurement sapphir e

11 2a Lateral size influence on magnetization distribution m z 1 0 PL PV PL PV -1 Illustration of magnetic configurations of Co anostructures with thickness d=3 d nm : disks with diameter : 2R=180nm, 2R=90 nm, the out-of-plane domain patterned leaf (PL) and vortex (PV). The total magnetic energy of the vortex state is lower in the both cases. disk with diameter 2R=45nm with out of plane domain configuration. wire with width w=15nm and length 1500nm (half of the whole sample is shown). Arrows denote mx and my magnetization components; out-of-plane mz one is marked in colors. Geometry-driven out-of-plane magnetization states in nanostructures, PHYSICAL REVIEW B 73, (2006)

12 2a K 1, K 2 anisotropy constants influence on magnetization distribution E A /(2πM S2 )=Q 1 sin 2 Θ+ Q 2 sin 4 Θ Q 2 = poster E total /(2πM 2 S ) Q 1

13 3. Results, plans Presentation of nanostructures studies results in : 32 published or accepted for publication papers 38 conferences presentations; 7 invited lectures. Proposition of the creation of Global Web Laboratory (GloLab) for research and many levels educational purposes.

14 Magnetism by Internet 3 works : 1) Working towards a global laboratory, Physics World, 19, 2, 17 (2006), 2) GloLab: creating a global Internetaccessible laboratory, Physics Education, 3) Remote teaching experiment on magnetic domains in thin films, European Journal of Physics.

15 Exemplary browser screen shots

16 Proposed GloLab structure Proposed GloLab structure? Remote experiment control data Remote experiment View experiment data 7th FP?? easy access to sophisticated experimental setups University users View experiment Knowledge dissemination and attracting young talents to Science School users Private users

17 Conclusions Nanomag-Lab fellows supported nanoscience semester in 2008 in Białystok open for Polish and foreign students???? Common development of Global Web Laboratory (GloLab) for research and many levels educational purposes???? It is expected help to our team in learning of new experimental tools - synchrotron radiation, BLS, SGH,..

18 Akcja szkół minilaboratoria