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Layer-dependent spin-orbit torques generated by the centrosymmetric transition metal dichalcogenide $\beta$-MoTe$_2$ by Stiehl, Gregory M.; Li, Ruofan; Gupta, Vishakha; Baggari, Ismail El; Jiang, Shengwei; Xie, Hongchao; Kourkoutis, Lena F.; Mak, Kin Fai; Shan, Jie; Buhrman, Robert A.; Ralph, Daniel C. is a scholarly article available to read on EtoBox.

What is Layer-dependent spin-orbit torques generated by the centrosymmetric transition metal dichalcogenide $\beta$-MoTe$_2$ about?

Single-crystal materials with sufficiently low crystal symmetry and strong spin-orbit interactions can be used to generate novel forms of spin-orbit torques on adjacent ferromagnets, such as the out-of-plane antidamping torque previously observed in WTe$_2$/ferromagnet heterostructures. Here, we present measurements of spin-orbit torques produced by the low-symmetry material $\beta$-MoTe$_2$, which unlike WTe$_2$ retains bulk inversion symmetry. We measure spin-orbit torques on $\beta$-MoTe$_2$/Permalloy heterostructures using spin-torque ferromagnetic resonance as a function of crystallographic alignment and MoTe$_2$ thickness down to the monolayer limit. We observe an out-of-plane antidamping torque with a spin torque conductivity as strong as 1/3 of that of WTe$_2$, demonstrating that the breaking of bulk inversion symmetry in the spin-generation material is not a necessary requirement for producing an out-of-plane antidamping torque. We also measure an unexpected dependence on the thickness of the $\beta$-MoTe$_2$ -- the out-of-plane antidamping torque is present in MoTe$_2$/Permalloy heterostructures when the $\beta$-MoTe$_2$ is a monolayer or trilayer thick, but goes to zero

Author

Stiehl, Gregory M.; Li, Ruofan; Gupta, Vishakha; Baggari, Ismail El; Jiang, Shengwei; Xie, Hongchao; Kourkoutis, Lena F.; Mak, Kin Fai; Shan, Jie; Buhrman, Robert A.; Ralph, Daniel C.

Published

2019

Language

EN