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Title: Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers

Abstract

We have fabricated strain-sensitive spin valves on flexible substrates by utilizing the large magnetostrictive FeGa alloy to promote the strain sensitivity and the composite free layer of FeGa/FeCo to avoid the drastic reduction of giant magnetoresistance (GMR) ratio. This kind of spin valve (SV-FeGa/FeCo) displays a MR ratio about 5.9%, which is comparable to that of the conventional spin valve (SV-FeCo) with a single FeCo free layer. Different from the previously reported works on magnetostrictive spin valves, the SV-FeGa/FeCo displays an asymmetric strain dependent GMR behavior. Upon increasing the lateral strain, the MR ratio for the ascending branch decreases more quickly than that for the descending branch, which is ascribed to the formation of a spiraling spin structure around the FeGa/FeCo interface under the combined influences of both magnetic field and mechanical strain. A strain sensitivity of GF = 7.2 was achieved at a magnetic bias field of -30 Oe in flexible SV-FeGa/FeCo, which is significantly larger than that of SV-FeCo.

Authors:
 [1]; ; ; ; ; ; ;  [1];  [2]
  1. Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (China)
  2. Institute of Materials Science, School of Materials Science and Engineering, Shanghai University, Shanghai 200072 (China)
Publication Date:
OSTI Identifier:
22611613
Resource Type:
Journal Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2158-3226
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALLOYS; ASYMMETRY; BINARY ALLOY SYSTEMS; COBALT COMPOUNDS; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; GALLIUM COMPOUNDS; INTERFACES; IRON COMPOUNDS; LAYERS; MAGNETIC FIELDS; MAGNETORESISTANCE; MAGNETOSTRICTION; SENSITIVITY; SPIN; STRAINS; SUBSTRATES; VALVES

Citation Formats

Liu, Luping, Institute of Materials Science, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, Zhan, Qingfeng, Yang, Huali, Li, Huihui, Zhang, Shuanglan, Liu, Yiwei, Wang, Baomin, Li, Run-Wei, and Tan, Xiaohua. Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers. United States: N. p., 2016. Web. doi:10.1063/1.4943770.
Liu, Luping, Institute of Materials Science, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, Zhan, Qingfeng, Yang, Huali, Li, Huihui, Zhang, Shuanglan, Liu, Yiwei, Wang, Baomin, Li, Run-Wei, & Tan, Xiaohua. Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers. United States. https://doi.org/10.1063/1.4943770
Liu, Luping, Institute of Materials Science, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, Zhan, Qingfeng, Yang, Huali, Li, Huihui, Zhang, Shuanglan, Liu, Yiwei, Wang, Baomin, Li, Run-Wei, and Tan, Xiaohua. 2016. "Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers". United States. https://doi.org/10.1063/1.4943770.
@article{osti_22611613,
title = {Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers},
author = {Liu, Luping and Institute of Materials Science, School of Materials Science and Engineering, Shanghai University, Shanghai 200072 and Zhan, Qingfeng and Yang, Huali and Li, Huihui and Zhang, Shuanglan and Liu, Yiwei and Wang, Baomin and Li, Run-Wei and Tan, Xiaohua},
abstractNote = {We have fabricated strain-sensitive spin valves on flexible substrates by utilizing the large magnetostrictive FeGa alloy to promote the strain sensitivity and the composite free layer of FeGa/FeCo to avoid the drastic reduction of giant magnetoresistance (GMR) ratio. This kind of spin valve (SV-FeGa/FeCo) displays a MR ratio about 5.9%, which is comparable to that of the conventional spin valve (SV-FeCo) with a single FeCo free layer. Different from the previously reported works on magnetostrictive spin valves, the SV-FeGa/FeCo displays an asymmetric strain dependent GMR behavior. Upon increasing the lateral strain, the MR ratio for the ascending branch decreases more quickly than that for the descending branch, which is ascribed to the formation of a spiraling spin structure around the FeGa/FeCo interface under the combined influences of both magnetic field and mechanical strain. A strain sensitivity of GF = 7.2 was achieved at a magnetic bias field of -30 Oe in flexible SV-FeGa/FeCo, which is significantly larger than that of SV-FeCo.},
doi = {10.1063/1.4943770},
url = {https://www.osti.gov/biblio/22611613}, journal = {AIP Advances},
issn = {2158-3226},
number = 3,
volume = 6,
place = {United States},
year = {Tue Mar 15 00:00:00 EDT 2016},
month = {Tue Mar 15 00:00:00 EDT 2016}
}