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arXiv 2109.14847cond-mat.mes-hall
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轻金属Ti中轨道霍尔效应的观测

Observation of the orbital Hall effect in a light metal Ti

Young-Gwan Choi, Daegeun Jo, Kyung-Hun Ko, Dongwook Go, Kyung-Han Kim, Hee Gyum Park, Changyoung Kim, Byoung-Chul Min, Gyung-Min Choi, Hyun-Woo Lee

AI总结:

本文首次在轻金属Ti中直接观测到轨道霍尔效应,通过Kerr旋转测量和轨道矩测量验证了轨道角动量作为电控磁性新机制的重要性。

摘要:

轨道角动量是轨道磁性、自旋霍尔效应、巨Rashba自旋劈裂、轨道Edelstein效应和自旋轨道矩的核心要素。然而,其实验探测十分困难。特别是,尽管轨道霍尔效应对于磁性纳米器件的电控至关重要,但其直接探测仍然难以实现。本文报道了在轻金属Ti中直接观测到轨道霍尔效应。我们测量了Ti表面累积轨道磁矩引起的Kerr旋转,结果与理论计算半定量一致,并得到了基于Ti的磁性异质结构中轨道矩测量的支持。这些结果证实了电子轨道角动量是一个重要的动力学自由度,可能为磁性的电控提供一种新机制。该结果也可能加深对与轨道动力学耦合的自旋、谷、声子和磁振子动力学的理解。

英文摘要:

The orbital angular momentum is a core ingredient of orbital magnetism, spin Hall effect, giant Rashba spin splitting, orbital Edelstein effect, and spin-orbit torque. However, its experimental detection is tricky. In particular, direct detection of the orbital Hall effect remains elusive despite its importance for electrical control of magnetic nanodevices. Here we report the direct observation of the orbital Hall effect in a light metal Ti. The Kerr rotation by the accumulated orbital magnetic moment is measured at Ti surfaces, whose result agrees with theoretical calculations semiquantitatively and is supported by the orbital torque measurement in Ti-based magnetic heterostructures. The results confirm the electron orbital angular momentum as an essential dynamic degree of freedom, which may provide a novel mechanism for the electric control of magnetism. The results may also deepen the understanding of spin, valley, phonon, and magnon dynamics coupled with orbital dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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