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TT: Fachverband Tiefe Temperaturen

TT 26: Focus Session: Engineered Magnetic Impurities: Interaction and Superconductivity

TT 26.2: Hauptvortrag

Dienstag, 8. März 2016, 10:00–10:30, H20

Magnetic anisotropy goes spintronic — •Maarten R. Wegewijs^1,2, Maciej Misiorny³, and Michael Hell^4,5 — ¹Peter Grünberg Institut, Forschungszentrum Jülich, Germany — ²Institute for Theory of Statistical Physics and JARA, RWTH Aachen, Germany — ³Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, Göteborg, Sweden — ⁴Division of Solid State Physics and NanoLund, Lund University, Sweden — ⁵Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Denmark

Magnetic anisotropy of quantum spins as found in magnetic atoms and single-molecule magnets has traditionally been considered an intrinsic effect, generated locally by the combination of spin-orbit coupling and ligand field effects. In this talk I will show that magnetic anisotropy can appear in an entirely new way in very simple spintronic setups where a spin-isotropic quantum dot is exposed to the influence of magnetic electrodes. Magnetic anisotropy can thus appear as a dissipative transport quantity which is able to "pile up" in a system, quite similar to how spin accumulates in a spin-valve. Moreover, magnetic anisotropy can also be generated from scratch by coherent transport processes, resulting in a quadrupolar proximity effect [1], similar to the well-known controllable dipolar exchange field [2]. This turns an isotropic quantum spin > 1/2 into a full-blown single-molecule magnet with electrically controllable magnetic bistability.
M. Misiorny, M. Hell , M. R. Wegewijs, Nature Phys. 9, 801, (2013)
M. Hell et al., PRB 91, 195404 (2015)