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Title: 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:
 [1];  [2];  [3];  [2];  [4];  [2];  [5]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Univ. of Texas, Austin, TX (United States). Microelectronics Research Center and Dept. of Electrical and Computer Engineering
  3. Univ. of California, Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences
  4. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Div.
  5. 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 Laboratory (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 = {Wed May 01 00:00:00 EDT 2019},
month = {Wed May 01 00:00:00 EDT 2019}
}

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Cited by: 46 works
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Works referencing / citing this record:

Modulation of Heavy Metal/Ferromagnetic Metal Interface for High‐Performance Spintronic Devices
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Spin-orbit torque generated by amorphous Fe$_{x}$Si$_{1-x}$
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