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Title: Spin Hall magnetoresistance in the non-collinear ferrimagnet GdIG close to the compensation temperature

Abstract

We investigate the spin Hall magnetoresistance (SMR) in a gadolinium iron garnet (GdIG)/platinum (Pt) heterostructure by angular dependent magnetoresistance measurements. The magnetic structure of the ferromagnetic insulator GdIG is non-collinear near the compensation temperature, while it is collinear far from the compensation temperature. In the collinear regime, the SMR signal in GdIG is consistent with the usual $${\rm si}{{{\rm n}}^{2}}\theta $$ relation well established in the collinear magnet yttrium iron garnet, with $$\theta $$ the angle between magnetization and spin Hall spin polarization direction. In the non-collinear regime, both an SMR signal with inverted sign and a more complex angular dependence with four maxima are observed within one sweep cycle. The number of maxima as well as the relative strength of different maxima depend strongly on temperature and field strength. Lastly, our results evidence a complex SMR behavior in the non-collinear magnetic regime that goes beyond the conventional formalism developed for collinear magnetic structures.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [2]
  1. Univ. of Science and Technology Beijing, Beijing (People's Republic of China); Graduate School of Excellence Materials Science in Mainz (MAINZ), Mainz (Germany); Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  2. Graduate School of Excellence Materials Science in Mainz (MAINZ), Mainz (Germany); Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  3. Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany)
  4. Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Southern Univ. of Science and Technology, Guangdong (People's Republic of China)
  5. Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany); Technische Univ. Dresden, Dresden (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1436923
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 30; Journal Issue: 3; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; spin Hall magnetoresistance; non-collinear ferrimagnet; spin current

Citation Formats

Dong, Bo -Wen, Cramer, Joel, Ganzhorn, Kathrin, Yuan, H. Y., Guo, Er-Jia, Goennenwein, Sebastian T. B., and Klaui, Mathias. Spin Hall magnetoresistance in the non-collinear ferrimagnet GdIG close to the compensation temperature. United States: N. p., 2017. Web. doi:10.1088/1361-648X/aa9e26.
Dong, Bo -Wen, Cramer, Joel, Ganzhorn, Kathrin, Yuan, H. Y., Guo, Er-Jia, Goennenwein, Sebastian T. B., & Klaui, Mathias. Spin Hall magnetoresistance in the non-collinear ferrimagnet GdIG close to the compensation temperature. United States. doi:10.1088/1361-648X/aa9e26.
Dong, Bo -Wen, Cramer, Joel, Ganzhorn, Kathrin, Yuan, H. Y., Guo, Er-Jia, Goennenwein, Sebastian T. B., and Klaui, Mathias. Thu . "Spin Hall magnetoresistance in the non-collinear ferrimagnet GdIG close to the compensation temperature". United States. doi:10.1088/1361-648X/aa9e26.
@article{osti_1436923,
title = {Spin Hall magnetoresistance in the non-collinear ferrimagnet GdIG close to the compensation temperature},
author = {Dong, Bo -Wen and Cramer, Joel and Ganzhorn, Kathrin and Yuan, H. Y. and Guo, Er-Jia and Goennenwein, Sebastian T. B. and Klaui, Mathias},
abstractNote = {We investigate the spin Hall magnetoresistance (SMR) in a gadolinium iron garnet (GdIG)/platinum (Pt) heterostructure by angular dependent magnetoresistance measurements. The magnetic structure of the ferromagnetic insulator GdIG is non-collinear near the compensation temperature, while it is collinear far from the compensation temperature. In the collinear regime, the SMR signal in GdIG is consistent with the usual ${\rm si}{{{\rm n}}^{2}}\theta $ relation well established in the collinear magnet yttrium iron garnet, with $\theta $ the angle between magnetization and spin Hall spin polarization direction. In the non-collinear regime, both an SMR signal with inverted sign and a more complex angular dependence with four maxima are observed within one sweep cycle. The number of maxima as well as the relative strength of different maxima depend strongly on temperature and field strength. Lastly, our results evidence a complex SMR behavior in the non-collinear magnetic regime that goes beyond the conventional formalism developed for collinear magnetic structures.},
doi = {10.1088/1361-648X/aa9e26},
journal = {Journal of Physics. Condensed Matter},
number = 3,
volume = 30,
place = {United States},
year = {Thu Dec 14 00:00:00 EST 2017},
month = {Thu Dec 14 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 14, 2018
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