Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 49, Pages 55411-55416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16485
Keywords
complex oxide heterostructures; spin-orbit-torques; Dirac nodal line (DNL); crystal symmetry; strain and band topology; amsotropic spin Hall conductivity; spin-torque ferromagnetic resonance (ST-FMR)
Funding
- National Science Foundation's MRSEC program through the Cornell Center for Materials Research [DMR-1719875]
- NSF's Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM) [DMR-1539918]
- Office of Naval Research [N00014-19-1-2143]
- NSF [DMR-1709255, ECCS-1542081]
- US Department of Energy [DE-SC0017671]
- U.S. Department of Energy (DOE) [DE-SC0017671] Funding Source: U.S. Department of Energy (DOE)
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We report spin-torque ferromagnetic resonance studies of the efficiency of the damping-like (xi(DL)) 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, sigma(SH). We find that the (001) films do exhibit exceptionally high xi(DL) ranging from 0.45 at 293 K to 0.65 at 30 K, which sets the lower bounds of sigma(SH) to be 1.9 x 10(5 )and 3.75 x 10(5) Omega(-1) m(-1), respectively, 10 times higher and of opposite sign than the theoretical prediction. Furthermore, xi(DL) and sigma(SH) are substantially reduced in anisotropically strained (110) films. We suggest that this high sensitivity to anisotropic strain is because of changes in contributions to sigma(SH) near the DNLs.
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