Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures
Abstract
Here, harmonic measurements of the longitudinal and transverse voltages in Bi-Sb/Co bilayers are presented. A large second harmonic voltage signal due to the ordinary Nernst effect is observed. In experiments where a magnetic field is rotated in the film plane, the ordinary Nernst effect shows the same angular dependence in the transverse voltage as the damping-like spin-orbit torque and in the longitudinal voltage as the unidirectional spin-Hall magnetoresistance, respectively. Therefore, the ordinary Nernst effect can be a spurious signal in spin-orbit torque measurements, leading to an overestimation of the spin-Hall angle and spin-Hall conductivity in topological insulators.
- Authors:
-
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Univ. of Texas, Austin, TX (United States). Microelectronics Research Center and Dept. of Electrical and Computer Engineering
- Univ. of California, Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences
- Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Div.
- Univ. of California, Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Div.
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Sciences & Engineering Division (SC-22.2)
- OSTI Identifier:
- 1526601
- Alternate Identifier(s):
- OSTI ID: 1510370
- Grant/Contract Number:
- AC02-05CH11231; AC02-05-CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 19; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Roschewsky, Niklas, Walker, Emily S., Gowtham, Praveen, Muschinske, Sarah, Hellman, Frances, Bank, Seth R., and Salahuddin, Sayeef. Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures. United States: N. p., 2019.
Web. doi:10.1103/physrevb.99.195103.
Roschewsky, Niklas, Walker, Emily S., Gowtham, Praveen, Muschinske, Sarah, Hellman, Frances, Bank, Seth R., & Salahuddin, Sayeef. Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures. United States. https://doi.org/10.1103/physrevb.99.195103
Roschewsky, Niklas, Walker, Emily S., Gowtham, Praveen, Muschinske, Sarah, Hellman, Frances, Bank, Seth R., and Salahuddin, Sayeef. Wed .
"Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures". United States. https://doi.org/10.1103/physrevb.99.195103. https://www.osti.gov/servlets/purl/1526601.
@article{osti_1526601,
title = {Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures},
author = {Roschewsky, Niklas and Walker, Emily S. and Gowtham, Praveen and Muschinske, Sarah and Hellman, Frances and Bank, Seth R. and Salahuddin, Sayeef},
abstractNote = {Here, harmonic measurements of the longitudinal and transverse voltages in Bi-Sb/Co bilayers are presented. A large second harmonic voltage signal due to the ordinary Nernst effect is observed. In experiments where a magnetic field is rotated in the film plane, the ordinary Nernst effect shows the same angular dependence in the transverse voltage as the damping-like spin-orbit torque and in the longitudinal voltage as the unidirectional spin-Hall magnetoresistance, respectively. Therefore, the ordinary Nernst effect can be a spurious signal in spin-orbit torque measurements, leading to an overestimation of the spin-Hall angle and spin-Hall conductivity in topological insulators.},
doi = {10.1103/physrevb.99.195103},
journal = {Physical Review B},
number = 19,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}
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