Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)
MA 35.10: Vortrag
Donnerstag, 21. März 2024, 12:00–12:15, H 2013
Modelling layer resolved spin-orbit torque assisted magnetization dynamics in Pt/Co bilayers — •Harshita Devda1, Andras Deak2, Leandro Salemi3, Levente Rozsa4, Laszlo Szunyogh2, Peter M. Oppeneer3, and Ulrich Nowak1 — 1University of Konstanz, Konstanz, Germany — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Uppsala University, Uppsala, Sweden — 4Wigner Research Centre for the Physics, Budapest, Hungary
Spin-orbit-torque(SOT) devices have acquired extensive attention for their unique features, encompassing low power consumption and efficient data storage capabilities. Recent discoveries of the Orbital Hall Effect and the Orbital Rashba-Edelstein Effect have added more intricacy to the understanding of magnetization switching mechanisms in these devices, especially in Nonmagnetic/Ferromagnet systems. To address this, we present a model for a Pt/Co bilayer system where we utilized Atomistic Spin Dynamics simulations, incorporating ab-initio calculated interaction parameters mapped to the Hamiltonian and electrically induced moments from first-principles calculations. Our descriptive model reveals the Spin and Orbital Hall Effect as the dominant mechanism behind magnetization switching in Pt/Co at low electric field strengths. Conversely, there is a significant magnetization dependence of the interface-generated moments at high field, leading to counterintuitive anti-switching behaviour with enhanced layer-resolved behavior in the presence of orbital moments.
Keywords: Spin orbit torques; Atomistic spin dynamics simulations; Orbial Hall Effect; Spin Hall Effect; Spin Rashba Edelstein Effect