Zhao, N;
Sud, A;
Sukegawa, H;
Komori, S;
Rogdakis, K;
Yamanoi, K;
Patchett, J;
... Kurebayashi, H; + view all
(2021)
Growth, strain, and spin-orbit torques in epitaxial Ni-Mn-Sb films sputtered on GaAs.
Physical Review Materials
, 5
(1)
, Article 014413. 10.1103/PhysRevMaterials.5.014413.
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Abstract
We report current-induced spin torques in epitaxial NiMnSb films on a commercially available epiready GaAs substrate. The NiMnSb was grown by cosputtering from three targets using optimized parameters. The films were processed into microscale bars to perform current-induced spin-torque measurements. Magnetic dynamics were excited by microwave currents, and electric voltages along the bars were measured to analyze the symmetry of the current-induced torques. We found that the extracted symmetry of the spin torques matches those expected from spin-orbit interaction in a tetragonally distorted half-Heusler crystal. Both fieldlike and dampinglike torques are observed in all the samples characterized, and the efficiency of the current-induced torques is comparable to that of ferromagnetic metal/heavy-metal bilayers.
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