Giant efficiency of long-range orbital torque in Co/Nb bilayers
Fufu Liu, Bokai Liang, Jie Xu, Chenglong Jia, Changjun Jiang
TL;DR
This paper provides experimental evidence of a strong orbital current in Nb films with weak spin-orbit coupling, demonstrating high efficiency of orbital torque in Co/Nb bilayers and revealing a long orbital diffusion length.
Contribution
It uncovers the significant orbital torque in Co/Nb bilayers and characterizes the long-range orbital transport in Nb, advancing understanding of orbital effects in spintronics.
Findings
Strong orbital current observed in Nb films.
Large orbital torque efficiency in Co/Nb bilayers.
Orbital diffusion length of approximately 3.1 nm.
Abstract
We report unambiguously experimental evidence of a strong orbital current in Nb films with weak spin-orbit coupling via the spin-torque ferromagnetic resonance (ST-FMR) spectrum for Fe/Nb and Co/Nb bilayers. The sign change of the damping-like torque in Co/Nb demonstrates a large spin-orbit correlation and thus great efficiency of orbital torque in Co/Nb. By studying the efficiency as a function of the thickness of Nb sublayer, we reveal a long orbital diffusion length (~3.1 nm) of Nb. Further planar Hall resistance (PHE) measurements at positive and negative applying current confirm the nonlocal orbital transport in ferromagnetic-metal/Nb heterostructures.
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Taxonomy
TopicsMagnetic properties of thin films · Physics of Superconductivity and Magnetism · Magnetic Properties and Applications