Theory of Condensed Matter: Hard Condensed Matter

June 2, 2016 at 2 p.m. in Medienraum

Prof. Dr. Jairo Sinova
Institut für Physik, SPICE

Spin-­orbit and spin-­tranfer torques in two dimensions
Mikhail Titov (Radboud University, Nijmegen)

Spin-orbit and spin-transfer torques are competing forces that drive magnetic domains in the heavy-metal/ferromagnet bi-layers. In this talk I present a microscopic theory of both effects that is naturally obtained from generalised Kubo formalism. In this formalism the torques are naturally related to the spin-susceptibility tensors that can be evaluated microscopically for a given model. Interestingly the formulation completely avoids the notion of the spin current. I discuss the torques arising in the effective 2D Bychkov-Rashba model and speculate on various generalisations of the results obtained.