Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)
TT 64.5: Vortrag
Donnerstag, 21. März 2024, 10:30–10:45, H 2013
Unconventional Spin-Orbit Torques in CrPt3 — •Robin Klause1, Yuxuan Xiao2,3, Jonathan Gibbons1,4, Axel Hoffmann1, and Eric Fullerton2 — 1University of Illinois Urbana-Champaign — 2University of California San Diego — 3TDK Corporation — 4Western Digital Corporation
Spin-orbit torques can efficiently control magnetization states using charge currents. However, with conventional spin-orbit torques, where charge current, spin current, and spin polarization are mutually perpendicular only in-plane magnetization parallel to the spin polarization can be switched field-free and deterministically. The topological semimetal CrPt3 has potential for generating unconventional spin-torques due to its ferrimagnetic ordering, topological band structure and high anomalous Hall conductivity. As CrPt3 exhibits ferrimagnetic behavior only in its chemically ordered phase while it is paramagnetic in its chemically disordered phase we can compare spin-torque generation in the two phases and investigate whether unconventional torques originate from the magnetic or crystal structure. We studied spin-torque generation in epitaxial CrPt3(110) films using angle dependent spin-torque ferromagnetic-resonance measurements with currents applied along specific crystal directions. We reveal unconventional spin-torques in both chemically ordered and disordered CrPt3 when current flows along the [1-11] and [-111] crystal directions. We conclude that the unconventional torque originates from the crystal order since these directions lack a mirror plane, allowing unconventional torques to be generated.
Keywords: spin-torque; spin polarization; spin transport; topological semimetal