论文标题
CO/NB双层中远程轨道扭矩的巨大效率
Giant efficiency of long-range orbital torque in Co/Nb bilayers
论文作者
论文摘要
我们报告了通过旋转型轨道耦合的NB薄膜中强轨道电流的明确实验证据，该膜通过旋转的铁磁共振（ST-FMR）光谱（ST-FMR）用于FE/NB和CO/NB双层。 CO/NB中阻尼样扭矩的符号变化显示出很大的自旋轨道相关性，因此CO/NB中轨道扭矩的效率很高。通过研究效率与NB子层厚度的函数，我们揭示了NB的长轨道扩散长度（〜3.1 nm）。在阳性和负施加电流时，进一步的平面霍尔电阻（PHE）测量证实了铁磁 - 金属/NB异质结构中的非局部轨道转运。
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.
