Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 58: Spintronics II (jointly with TT, HL)
MA 58.2: Talk
Thursday, March 17, 2011, 17:30–17:45, HSZ 401
Spin-quadrupole Currents in Spin-valves — •Michael Hell1,2, Sourin Das4, and Maarten Rolf Wegewijs1,2,3 — 1Intitute for Solid State Research Theory 3, Research Center Jülich — 2JARA - Fundamentals of Future Information Technology — 3Institute for Theoretical Physics A, RWTH-Aachen — 4Department of Physics and Astrophysics, University of Delhi
Spin-quadrupole moments (SQM) quantify the magnetic anisotropy of a nanostructure, in addition to its spin-polarization. We illustrate the possibility of quantum transport of SQM for a simple tunnel junction between two spin-polarized leads. Inspired by this, we present a more general spintronic transport theory for high-spin quantum dots coupled to ferromagnets. We show that SQM has to be treated as an independent degree of freedom, on the same footing as charge and spin polarization. Since SQM and its current are two-particle quantities, they have direct and exchange contributions as well as both local and non-local SQM sources. Moreover, the SQM current operator is derived which is shown to obey a continuity equation. We predict the electric control of the transfer of spin-anisotropy in elementary nanostructures.