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Title: Determination of spin relaxation times in heavy metals via second-harmonic spin injection magnetoresistance

Abstract

In tunnel junctions between ferromagnets and heavy elements with strong spin orbit coupling the magnetoresistance is usually dominated by tunneling anisotropic magnetoresistance (TAMR). This makes conventional DC spin injection techniques impractical for determining the spin relaxation time τs. Here, we show that this obstacle for measurements of τs can be overcome by second-harmonic spin-injection magnetoresistance (SIMR). In the second-harmonic signal the SIMR is comparable in magnitude to TAMR, thus enabling Hanle-induced SIMR as a powerful tool to directly determine τs. Using this approach we determined the spin relaxation time of Pt and Ta and their temperature dependences. In conclusion, the spin relaxation in Pt seems to be governed by the Elliott-Yafet mechanism due to a constant resistivity × spin relaxation time product over a wide temperature range.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China); China and Univ. of Chinese Academy of Sciences, Beijing (China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Shanghai Univ., Shanghai (China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); Chinese Academy of Sciences (CAS), Strategic Priority Research Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Ministry of Science and Technology of the Republic of China (MOST); USDOE
OSTI Identifier:
1480265
Alternate Identifier(s):
OSTI ID: 1400330
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Fang, C., Wan, C. H., Yang, B. S., Qin, J. Y., Tao, B. S., Wu, H., Zhang, X., Han, X. F., Hoffmann, A., Liu, X. M., and Jin, Z. M. Determination of spin relaxation times in heavy metals via second-harmonic spin injection magnetoresistance. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.134421.
Fang, C., Wan, C. H., Yang, B. S., Qin, J. Y., Tao, B. S., Wu, H., Zhang, X., Han, X. F., Hoffmann, A., Liu, X. M., & Jin, Z. M. Determination of spin relaxation times in heavy metals via second-harmonic spin injection magnetoresistance. United States. doi:10.1103/PhysRevB.96.134421.
Fang, C., Wan, C. H., Yang, B. S., Qin, J. Y., Tao, B. S., Wu, H., Zhang, X., Han, X. F., Hoffmann, A., Liu, X. M., and Jin, Z. M. Thu . "Determination of spin relaxation times in heavy metals via second-harmonic spin injection magnetoresistance". United States. doi:10.1103/PhysRevB.96.134421. https://www.osti.gov/servlets/purl/1480265.
@article{osti_1480265,
title = {Determination of spin relaxation times in heavy metals via second-harmonic spin injection magnetoresistance},
author = {Fang, C. and Wan, C. H. and Yang, B. S. and Qin, J. Y. and Tao, B. S. and Wu, H. and Zhang, X. and Han, X. F. and Hoffmann, A. and Liu, X. M. and Jin, Z. M.},
abstractNote = {In tunnel junctions between ferromagnets and heavy elements with strong spin orbit coupling the magnetoresistance is usually dominated by tunneling anisotropic magnetoresistance (TAMR). This makes conventional DC spin injection techniques impractical for determining the spin relaxation time τs. Here, we show that this obstacle for measurements of τs can be overcome by second-harmonic spin-injection magnetoresistance (SIMR). In the second-harmonic signal the SIMR is comparable in magnitude to TAMR, thus enabling Hanle-induced SIMR as a powerful tool to directly determine τs. Using this approach we determined the spin relaxation time of Pt and Ta and their temperature dependences. In conclusion, the spin relaxation in Pt seems to be governed by the Elliott-Yafet mechanism due to a constant resistivity × spin relaxation time product over a wide temperature range.},
doi = {10.1103/PhysRevB.96.134421},
journal = {Physical Review B},
number = 13,
volume = 96,
place = {United States},
year = {2017},
month = {10}
}

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