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Li, Peng; Wu, Weikang; Wen, Yan; Zhang, Chenhui; Zhang, Junwei; Zhang, Senfu; Yu, Zhiming; Yang, Shengyuan A.; Manchon, A.; Zhang, Xi-xiang
Nature communications, 09/2018, Letnik: 9, Številka: 1Journal Article
Abstract Spin–orbit torque has recently been intensively investigated for the purposes of manipulating the magnetization in magnetic nano-devices and understanding fundamental physics. Therefore, the search for novel materials or material combinations that exhibit a strong enough spin-torque effect has become one of the top priorities in this field of spintronics. Weyl semimetal, a new topological material that features open Fermi arc with strong spin–orbit coupling and spin–momentum locking effect, is naturally expected to exhibit an enhanced spin-torque effect in magnetic nano-devices. Here we observe a significantly enhanced spin conductivity, which is associated with the field-like torque at low temperatures. The enhancement is obtained in the b -axis WTe 2 /Py bilayers of nano-devices but not observed in the a -axis of WTe 2 /Py nano-devices, which can be ascribed to the enhanced spin accumulation by the spin–momentum locking effect of the Fermi arcs of the Weyl semimetal WTe 2 .
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