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arXiv · 2401.05703

Orbital Hanle Magnetoresistance in a 3d Transition Metal

Giacomo Sala·Hanchen Wang·William Legrand·Pietro Gambardella
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Abstract

The Hanle magnetoresistance is a telltale signature of spin precession in nonmagnetic conductors, in which strong spin-orbit coupling generates edge spin accumulation via the spin Hall effect. Here, we report the existence of a large Hanle magnetoresistance in single layers of Mn with weak spin-orbit coupling, which we attribute to the orbital Hall effect. The simultaneous observation of a sizable Hanle magnetoresistance and vanishing small spin Hall magnetoresistance in BiYIG/Mn bilayers corroborates the orbital origin of both effects. We estimate an orbital Hall angle of 0.016, an orbital relaxation time of 2 ps and diffusion length of the order of 2 nm in disordered Mn. Our findings indicate that current-induced orbital moments are responsible for magnetoresistance effects comparable to or even larger than those determined by spin moments, and provide a tool to investigate nonequilibrium orbital transport phenomena.

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Giacomo Sala, Hanchen Wang, William Legrand, Pietro Gambardella. 2024-01-11. Orbital Hanle Magnetoresistance in a 3d Transition Metal. https://doi.org/10.1103/physrevlett.131.156703

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