Spin-momentum locking and spin-orbit torques in magnetic nano-heterojunctions composed of Weyl semimetal WTe2.

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 WTe2/Py bilayers of nano-devices but not observed in the a-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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Li P,Wu W,Wen Y,Zhang C,Zhang J,Zhang S,Yu Z,Yang SA,Manchon A,Zhang XX

doi

10.1038/s41467-018-06518-1

subject

Has Abstract

pub_date

2018-09-28 00:00:00

pages

3990

issue

1

issn

2041-1723

pii

10.1038/s41467-018-06518-1

journal_volume

9

pub_type

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