MOLECULAR SPITROICS Eugenio Coronado
Spintronics Manipulation of the spin by electrical means (current, electric field) optical means (light) mechanical means (pressure). At the nanoscale
Molecular Spintronics Multifunctional Materials anospintronics
Molecular Spintronics Multifunctional Materials anospintronics
EXAMPLE 1 Hybrid magnetic conductors Magnetic conductors FERROMAGETIC LAYER + ORGAIC DOOR MOLECULE [M II M III (ox) 3 ] -
Hybrid magnetic conductors EXAMPLE 1 Magnetic conductors [BEDT-TTF] 2.6 [MnCr(ox) 3 ].CH 2 Cl 2 0.4 nm Ferromagnetic 1.2 nm 16.6 Å Metallic 0.4 nm Ferromagnetic E. Coronado et al. ature 2000, 408, 447 JR Galán, E. Coronado et al. JACS 2010, 132, 9271 (Chiral Magnetic Conductor)
EXAMPLE 2 Hybrid magnetic conductors Magnetic superconductors ife Ferromagnetic cation layer T c = 4 K T c = 18 K Superconducting anion layer T c = 4.5-5 K E. Coronado et al. ature Chem. 2010, 2, 1031
Hybrid magnetic conductors EXAMPLE 2 Magnetic superconductors [TaS2]-0.3 : -0.022/Å2 0.4 nm 0.5 nm [ial]+0.3 : +0.021/Å2 Matching in the charge density of the sheets
Hybrid magnetic conductors Magnetic Superconductor (with ferromagnetic i-fe layers) PURE i-fe layer HYBRID i-fe / TaS2
Hybrid magnetic conductors Magnetic Superconductor (with ferromagnetic i-fe layers) PURE i-fe layer HYBRID i-fe / TaS2
Magnetic Insertion of magnetic Single Superconductors: Molecule Magnets in superconductor molecules (single-molecule magnets, spin-crossover ) Structure Mn4 2+ G. Christou, D.. Hendrickson et al. Inorg. Chem. 2000, 39, 3615 [Mn4][TaS2]6 Adv. Mat. 2011, in press
Magnetic Mn 4 intercalated Superconductors: in a layered Insertion superconductor of magnetic molecules (single-molecule magnets) Magnetic Characterization [Mn 4 ][TaS 2 ] 6 Hysteresis Superconductivity is maintained The energy barrier of the SMM is reduced by 1/2 (from 24 to 12 K)
Molecular Spintronics Multifunctional Materials anospintronics
From Spintronics to anospintronics Electron transport across molecular magnets Molecular transistor Molecular spin valve Molecular spin qubits
Molecular Spintronics Multifunctional Materials anospintronics Switching nanoparticles Single-molecule magnets bits qubits
Switching Magnetic nanoparticles Fe(II)(LS) Fe(II) (HS) Spin crossover complexes Low Spin High Spin T, hν, P S = 0 Fe- = 1.8 Å S = 2 Fe- = 2.0 Å
Switching Magnetic nanoparticles Fe Fe Fe BISTABLE MAGETIC AOPARTICLES ( 10 nm) prepared by the reverse micelles technique E. Coronado, J. R. Galán et al. Adv. Mater. 2007, 19, 1359 Inorg. Chem. 2010, 49, 5706
Optical and Magnetic measurements MAGETIC BISTABILITY HS LS LS HS Suspension in octane
Transport measurements Transport measurements on Au nanogaps ( 5 nm) (H. Van der Zant, F. Prins) 6 before deposition after deposition 5 nm 100 nm I (na) 3 0 At RT -3-6 -0.4-0.2 0.0 V (V) 0.2 0.4
Transport measurements Transport measurements vs. T 0.4 V I (A) 2.00E-011 1.50E-011 1.00E-011 5.00E-012 0.00E+000 295 310 320 325 HS LS -5.00E-012-1.00E-011-0.6-0.4-0.2 0.0 0.2 0.4 0.6 V (V) H. Van der Zant, E. Coronado et al. Adv. Mater. 2011, 23, 1545. Spin-dependent conductivity
Transport measurements Bias voltage induced spin-crossover? 0.3 10 K I (na) 0.2 0.1 H. Van der Zant, E. Coronado et al. Adv. Mater. 2011, 23, 1545. 0.0 0.0 0.5 1.0 V (V)
SIGLE-MOLECULE MAGETS SPI QUBITS
SMMs based on POMs AlDamen et al., HoW 10-1 ) Energy (cm 350 300 250 200 150 100 50 0 Ground state: m J = ±4-50 -8-6 -4-2 0 2 4 6 8 J projection m J U eff = 2.5 cm -1
POMs as SPI-QUBITS Ho 0.25 Y 0.75 W 10 Pulsed EPR (X-band) Rabi oscillations in a concentrated sample T 1 = 1 µs T 2 = 180 ns very robust spin qubit
POMs as SPI-QUBITS Pulsed EPR (X-band) Ho x Y 1-x W 10 concentration dependence Very long quantum coherence time From T 2 = 180 ns to 1.2 µs and could be improved!!! (by deuteration) V 15 (S=1/2) T 2 800 ns B. Barbara et al. ature 453, 203 (2008)
Univ. Valencia (ICMol) - Efren avarro-moratalla - María Monrabal - Elena Pinilla-Cienfuegos - Gonzalo Abellán - Carlos Martí Gastaldo (Liverpool) - Sergio Tatay (Thales, Paris) - José Ramón Galán (ICIQ) - Antonio Ribera Acknowledgment ICMA-CSIC - Fernando Luis Univ. Oxford - Steve Blundell - Peter Baker TU Delft -Ferry Prins - Herre van der Zant
European Union: MolSpinQIP HITS ELFOS Spanish Ministry of Science and Innovation Generalitat Valenciana Support COSOLIDER-IGEIO on Molecular anoscience PROMETEO Program SPIMol