SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Spin Transport and Orbitronics, Spin-Hall Effects (joint session MA/TT)
MA 4.8: Vortrag
Montag, 27. März 2023, 11:15–11:30, HSZ 403
Layer-resolved spin-orbit torque assisted magnetization dynamics in Pt/Co heterostructure — •Harshita Devda1, András Deák2, Leandro Salemi3, Levente Rózsa1, László Szunyogh2, Peter M. Oppeneer3, and Ulrich Nowak1 — 1Universität Konstanz, Konstanz, Germany — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Uppsala University, Uppsala, Sweden
It is well known that the spin-orbit torque (SOT) mechanism is more reliable for current induced magnetization dynamics than the spin-transfer torque. The key phenomenon behind the SOT in heavy metal/ferromagnet (HM/FM) bilayers is attributed to the spin Hall effect (SHE) and the spin Rashba-Edelstein effect (SREE). However, the exact mechanism is still under debate. So far various works have studied the SOT-driven magnetic behavior in different magnetic systems, but the layer-resolved understanding of the SOT effect in the HM/FM bilayer due to spin-orbit coupling (SOC) in heavy metal is still lacking. We focus on current-induced magnetization dynamics in a Pt/Co bilayer assisted by the SOC in Pt. We use a multiscale model which links ab initio calculations with atomistic spin dynamics simulations. We implement a linear-response formalism to compute the electrically induced magnetic moments, caused by SHE in bulk and SREE at the interface, and utilize these in atomistic spin dynamics simulations. We analyse the layer-resolved behavior of both field-like and damping-like torques in FM and determine how they affect magnetization dynamics in ferromagnets.