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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Spintronics (incl. Quantum Dynamics) (jointly with HL, TT)

MA 53.8: Vortrag

Freitag, 20. März 2015, 11:30–11:45, EB 202

Spin transfer by pure spin current at magnetic interfaces — •Wei Chen1, Manfred Sigrist2, Jairo Sinova3, and Dirk Manske11Max Planck Institute for Solid State Research, Stuttgart — 2ETH-Zurich, Zurich, Switzerland — 3Johannes Gutenberg University-Mainz, Mainz

We present a microscopic theory for the spin transfer torque, spin pumping, spin mixing conductance, and Onsager relation caused by the pure spin current in the normal metal/ferromagnetic insulator bilayer (such as Pt/YIG) and normal metal/ferromagnetic metal/oxide trilayer (such as Pt/Co/AlOx). The spin Hall effect in the normal metal generates a pure spin current which, upon quantum tunneling into the ferromagnet, causes the magnetization dynamics. The field-like and damping-like component of these spin-transfer quantities are expressed in terms of characteristic energy scales such as the insulating gap and sd hybridization, which are applicable to a wide range of materials, hence the result can guide the search for materials that have a particular function in spin transport.

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