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

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.

doi:10.1103/PhysRevB.96.134421

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

Journal Article · Thu Oct 19 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.134421· OSTI ID:1480265

Fang, C. ^[1]; Wan, C. H. ^[1]; Yang, B. S. ^[1]; Qin, J. Y. ^[1]; Tao, B. S. ^[1]; Wu, H. ^[1]; Zhang, X. ^[1]; Han, X. F. ^[1]; Hoffmann, A. ^[2]; Liu, X. M. ^[3]; Jin, Z. M. ^[3]

Chinese Academy of Sciences (CAS), Beijing (China); China and Univ. of Chinese Academy of Sciences, Beijing (China)
Argonne National Lab. (ANL), Argonne, IL (United States)
Shanghai Univ., Shanghai (China)

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 τ_s. Here, we show that this obstacle for measurements of τ_s 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 τ_s. 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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); 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

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1480265

Alternate ID(s):: OSTI ID: 1400330

Journal Information:: Physical Review B, Vol. 96, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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