Open AccessTemperature dependence of spin-orbit torques across the magnetic compensation point in a ferrimagnetic TbCo alloy film
Author(s) -
Kohei Ueda,
Maxwell Mann,
Paul W. P. de Brouwer,
David Bono,
Geoffrey S. D. Beach
Publication year - 2017
Publication title -
physical review. b./physical review. b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.78
H-Index - 465
eISSN - 2469-9969
pISSN - 2469-9950
DOI - 10.1103/physrevb.96.064410
Subject(s) - ferrimagnetism , condensed matter physics , magnetization , materials science , spin (aerodynamics) , anisotropy , alloy , saturation (graph theory) , bilayer , curie temperature , magnetic field , physics , ferromagnetism , chemistry , optics , thermodynamics , metallurgy , mathematics , biochemistry , quantum mechanics , combinatorics , membrane
The temperature dependence of spin-orbit torques (SOTs) and spin-dependent transport parameters is measured in bilayer Ta/TbCo ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy. We find that the dampinglike (DL)-SOT effective field diverges as temperature is swept through the magnetic compensation temperature (T[subscript M]), where the net magnetization vanishes due to the opposing contributions from the Tb and Co sublattices. We show that DL-SOT scales with the inverse of the saturation magnetization (M[subscript s]), whereas the spin-torque efficiency is independent of the temperature-dependent M [subscript s]. Our findings provide insight into spin transport mechanisms in ferrimagnets and highlight low-M [subscript s] rare-earth/transition-metal alloys as promising candidates for SOT device applications.National Science Foundation (U.S.) (NSF-ECCS-1408172
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