Effects of Anisotropic Strain on Spin–Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO2
Abstract
We report spin-torque ferromagnetic resonance studies of the efficiency of the damping-like (ξDL) 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 ξDL 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, ξDL and σSH are substantially reduced in anisotropically strained (110) films. Here, we suggest that this high sensitivity to anisotropic strain is because of changes in contributions to σSH near the DNLs.
- Authors:
-
[1];
[3];
[3];
- Cornell Univ., Ithaca, NY (United States)
- Univ. of Texas, Austin, TX (United States)
- Cornell Univ., Ithaca, NY (United States); Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States)
- Publication Date:
- Research Org.:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1785272
- Grant/Contract Number:
- SC0017671
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Applied Materials and Interfaces
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 49; Journal ID: ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; complex oxide heterostructures; spin−orbit-torques; Dirac nodal line (DNL); crystal symmetry; strain and band topology; anisotropic spin Hall conductivity; spin-torque ferromagnetic resonance (ST-FMR); thin films; oxides; layers; quantum mechanics; transition metals
Citation Formats
Bose, Arnab, Nelson, Jocienne N., Zhang, Xiyue S., Jadaun, Priyamvada, Jain, Rakshit, Schlom, Darrell. G., Ralph, Daniel. C., Muller, David. A., Shen, Kyle. M., and Buhrman, Robert. A. Effects of Anisotropic Strain on Spin–Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO2. United States: N. p., 2020.
Web. doi:10.1021/acsami.0c16485.
Bose, Arnab, Nelson, Jocienne N., Zhang, Xiyue S., Jadaun, Priyamvada, Jain, Rakshit, Schlom, Darrell. G., Ralph, Daniel. C., Muller, David. A., Shen, Kyle. M., & Buhrman, Robert. A. Effects of Anisotropic Strain on Spin–Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO2. United States. https://doi.org/10.1021/acsami.0c16485
Bose, Arnab, Nelson, Jocienne N., Zhang, Xiyue S., Jadaun, Priyamvada, Jain, Rakshit, Schlom, Darrell. G., Ralph, Daniel. C., Muller, David. A., Shen, Kyle. M., and Buhrman, Robert. A. Tue .
"Effects of Anisotropic Strain on Spin–Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO2". United States. https://doi.org/10.1021/acsami.0c16485. https://www.osti.gov/servlets/purl/1785272.
@article{osti_1785272,
title = {Effects of Anisotropic Strain on Spin–Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO2},
author = {Bose, Arnab and Nelson, Jocienne N. and Zhang, Xiyue S. and Jadaun, Priyamvada and Jain, Rakshit and Schlom, Darrell. G. and Ralph, Daniel. C. and Muller, David. A. and Shen, Kyle. M. and Buhrman, Robert. A.},
abstractNote = {We report spin-torque ferromagnetic resonance studies of the efficiency of the damping-like (ξDL) 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 ξDL 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, ξDL and σSH are substantially reduced in anisotropically strained (110) films. Here, we suggest that this high sensitivity to anisotropic strain is because of changes in contributions to σSH near the DNLs.},
doi = {10.1021/acsami.0c16485},
journal = {ACS Applied Materials and Interfaces},
number = 49,
volume = 12,
place = {United States},
year = {Tue Nov 24 00:00:00 EST 2020},
month = {Tue Nov 24 00:00:00 EST 2020}
}
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