Work

Giant efficiency of long-range orbital torque in Co/Nb bilayers

Year: 2023

Type: article

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 spectrum for Fe/Nb and Co/Nb bilayers. The sign change in the dampinglike 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 (\ensuremath{\sim}3.1 nm) of Nb. Further planar Hall resistance measurements at positive and negative applying current confirm the nonlocal orbital transport in ferromagnetic-metal/Nb heterostructures.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.107.054404

Authors: Fu Liu, Bokai Liang, Jie Xu, Chenglong Jia, Changjun Jiang

Institution: Lanzhou University

Language: English

Topic: Magnetic properties of thin films

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Natural Science Foundation of Gansu Province

Awards: G8541303330, 长程强磁-电耦合控制磁化强度进动相位的机制研究