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Observation of orbit-orbit torques: Highly efficient torques on orbital moments induced by orbital currents
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DOI：10.1142/S0217984926500806.png)
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Abstract
En 中文
We study the current-induced torques in bilayers composed of a light 3d metal, chromium, and a rare-earth ferromagnet with finite orbital moments, terbium, utilizing second-harmonic Hall-response measurements. The damping-like torque efficiency xi DLj of chromium is found to be positive and reaches a giant value similar to 3.66 in this system, in sharp contrast to the negative and subtle xi DLj in general Cr/ferromagnet heterostructures with quenched orbital moments. We suggest that the orbital currents generated by the orbital Hall effect in Cr can be injected into Tb with negligible loss at the interface and then efficiently interact with the orbital moments. We term such an exotic effect as the orbit-orbit torque (OOT). Our work implies that orbital currents could be harnessed to manipulate the orbital magnetization of materials, which would advance the development of orbitronics.
Keywords:
Orbital hall effects
orbital torques
spin-orbit torques
chromium
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2.2
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207
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6.6K
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