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Effects of Anisotropic Strain on Spin-Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO2

Cornell Affiliated Author(s)

Author

Arnab Bose
Jocienne Nelson
Xiyue Zhang
Priyamvada Jadaun
Rakshit Jain
Darrell. Schlom
Daniel. Ralph
David. Muller
Kyle. Shen
Robert Buhrman

Abstract

We report spin-torque ferromagnetic resonance studies of the efficiency of the damping-like (ζDL) spin-orbit torque exerted on an adjacent ferromagnet film by current flowing in epitaxial (001) and (110) IrO2 thin films. IrO2 possesses Dirac nodal lines (DNLs) in the band structure that are gapped by spin-orbit coupling, which could enable a very high spin Hall conductivity, σSH. We find that the (001) films do exhibit exceptionally high ζDL ranging from 0.45 at 293 K to 0.65 at 30 K, which sets the lower bounds of σSH to be 1.9 × 105 and 3.75 × 105 ω-1 m-1, respectively, 10 times higher and of opposite sign than the theoretical prediction. Furthermore, ζDL and σSH are substantially reduced in anisotropically strained (110) films. We suggest that this high sensitivity to anisotropic strain is because of changes in contributions to σSH near the DNLs. ©

Date Published

Journal

American Chemical Society (ACS)

Volume

12

Issue

49

Number of Pages

55411-55416,

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097811836&doi=10.1021%2facsami.0c16485&partnerID=40&md5=aea02f82579d9e1222342a52fffe4dc1

DOI

10.1021/acsami.0c16485

Group (Lab)

Kyle Shen Group

Funding Source

DE-SC0017671
ECCS-1542081
1542081
1709255
1719875
DMR-1539918
DMR-1719875
DMR-1709255
N00014-19-1-2143

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