Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 103: Spintronics incl. quantum dynamics (MA with HL/TT)

HL 103.8: Talk

Friday, March 20, 2015, 11:30–11:45, EB 202

Spin transfer by pure spin current at magnetic interfaces — •Wei Chen¹, Manfred Sigrist², Jairo Sinova³, and Dirk Manske¹ — ¹Max 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/AlO_x). 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 s−d 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.