Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-018-06518-1
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- King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) [CRF-2015-SENSORS-2709, CRF-2015-2626-RG4]
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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 WTe2/Py bilayers of nano-devices but not observed in the alpha-axis of WTe2/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 WTe2.
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