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Title: Quantification of the spin-Hall anti-damping torque with a resonance spectrometer

Abstract

We present a simple technique using a cavity-based resonance spectrometer to quantify the anti-damping torque due to the spin Hall effect. Modification of ferromagnetic resonance is observed as a function of small DC current in sub-mm-wide strips of bilayers, consisting of magnetically soft FeGaB and strong spin-Hall metal Ta. From the detected current-induced linewidth change, we obtain an effective spin Hall angle of 0.08–0.09 independent of the magnetic layer thickness. Our results demonstrate that a sensitive resonance spectrometer can be a general tool to investigate spin Hall effects in various material systems, even those with vanishingly low conductivity and magnetoresistance.

Authors:
; ; ; ;  [1]; ; ;  [2];  [3]
  1. Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)
  2. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States)
  3. Department of Chemistry, Northeastern University, Boston, Massachusetts 02115 (United States)
Publication Date:
OSTI Identifier:
22399116
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DAMPING; DIRECT CURRENT; FERROMAGNETIC RESONANCE; GALLIUM COMPOUNDS; HALL EFFECT; IRON BORIDES; LAYERS; MAGNETORESISTANCE; MODIFICATIONS; SPECTROMETERS; SPIN; TANTALUM; THICKNESS; TORQUE

Citation Formats

Emori, Satoru, E-mail: s.emori@neu.edu, Nan, Tianxiang, Oxholm, Trevor M., Boone, Carl T., Sun, Nian X., E-mail: n.sun@neu.edu, Jones, John G., Howe, Brandon M., Brown, Gail J., and Budil, David E. Quantification of the spin-Hall anti-damping torque with a resonance spectrometer. United States: N. p., 2015. Web. doi:10.1063/1.4906062.
Emori, Satoru, E-mail: s.emori@neu.edu, Nan, Tianxiang, Oxholm, Trevor M., Boone, Carl T., Sun, Nian X., E-mail: n.sun@neu.edu, Jones, John G., Howe, Brandon M., Brown, Gail J., & Budil, David E. Quantification of the spin-Hall anti-damping torque with a resonance spectrometer. United States. doi:10.1063/1.4906062.
Emori, Satoru, E-mail: s.emori@neu.edu, Nan, Tianxiang, Oxholm, Trevor M., Boone, Carl T., Sun, Nian X., E-mail: n.sun@neu.edu, Jones, John G., Howe, Brandon M., Brown, Gail J., and Budil, David E. Mon . "Quantification of the spin-Hall anti-damping torque with a resonance spectrometer". United States. doi:10.1063/1.4906062.
@article{osti_22399116,
title = {Quantification of the spin-Hall anti-damping torque with a resonance spectrometer},
author = {Emori, Satoru, E-mail: s.emori@neu.edu and Nan, Tianxiang and Oxholm, Trevor M. and Boone, Carl T. and Sun, Nian X., E-mail: n.sun@neu.edu and Jones, John G. and Howe, Brandon M. and Brown, Gail J. and Budil, David E.},
abstractNote = {We present a simple technique using a cavity-based resonance spectrometer to quantify the anti-damping torque due to the spin Hall effect. Modification of ferromagnetic resonance is observed as a function of small DC current in sub-mm-wide strips of bilayers, consisting of magnetically soft FeGaB and strong spin-Hall metal Ta. From the detected current-induced linewidth change, we obtain an effective spin Hall angle of 0.08–0.09 independent of the magnetic layer thickness. Our results demonstrate that a sensitive resonance spectrometer can be a general tool to investigate spin Hall effects in various material systems, even those with vanishingly low conductivity and magnetoresistance.},
doi = {10.1063/1.4906062},
journal = {Applied Physics Letters},
number = 2,
volume = 106,
place = {United States},
year = {Mon Jan 12 00:00:00 EST 2015},
month = {Mon Jan 12 00:00:00 EST 2015}
}