Orbital Hanle Magnetoresistance in a 3d Transition Metal

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.

References in corpus (10)

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• Orbital Edelstein effect of electronic itinerant orbital motion at edges
• Giant orbital Hall effect due to the bulk states of 3D topological insulators
• Ultrafast chiral precession of spin and orbital angular momentum induced by circularly polarized laser pulse
• Chirality-induced selectivity of angular momentum by orbital Edelstein effect in carbon nanotubes
• Filtering Spin and Orbital Moment in Centrosymmetric Systems
• Coexistent multifractal mesoscopic fluctuations in Integer Quantum Hall Transition and in Orbital Hall Transition
• Universal intrinsic orbital dynamics from Berry curvature in electronic two-band systems
• Orbital Hall effect in spin-3/2 hole-doped semiconductors and its implications for orbitronics
• Orbital Hall effect from orbital magnetic moments of Bloch states: the role of a new correction term