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Title: Effects of repetitive bending on the magnetoresistance of a flexible spin-valve

Abstract

A positive magnetostrictive single layer (CoFe) and top-pinned spin-valve structure with positive magnetostrictive free (NiFe) and pinned (CoFe) layers were deposited on flexible polyethylene terephthalate film to investigate the changes in the magnetic properties in flexible environments, especially with a repetitive bending process. It was found that the stress, applied by repetitive bending, changes significantly the magnetic anisotropy of both layers in a single and spin-valve structure depending on the direction of applied stress. The changes in magnetic anisotropy were understood in terms of the inverse magnetostriction effect (the Villari effect) and the elastic recovery force from the flexibility of the polymer substrate. Repetitive bending with tensile stress transverse (or parallel) to the magnetic easy axis was found to enhance (or reduce) the magnetic anisotropy and, consequently, the magnetoresistance ratio of a spin-valve. The observed effects of bending stress in this study should be considered for the practical applications of electro-magnetic devices, especially magneto-striction sensor.

Authors:
; ;  [1];  [2]
  1. Department of Physics, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
  2. Department of Physics, Sejong University, Seoul 143-747 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22410135
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COBALT; FILMS; FLEXIBILITY; INTERMETALLIC COMPOUNDS; IRON; LAYERS; MAGNETORESISTANCE; MAGNETOSTRICTION; NICKEL; POLYESTERS; SENSORS; SPIN; STRESSES; SUBSTRATES; VALVES

Citation Formats

Kwon, J. -H., Kwak, W. -Y., Cho, B. K., E-mail: chobk@gist.ac.kr, Choi, H. Y., and Kim, G. H. Effects of repetitive bending on the magnetoresistance of a flexible spin-valve. United States: N. p., 2015. Web. doi:10.1063/1.4914533.
Kwon, J. -H., Kwak, W. -Y., Cho, B. K., E-mail: chobk@gist.ac.kr, Choi, H. Y., & Kim, G. H. Effects of repetitive bending on the magnetoresistance of a flexible spin-valve. United States. https://doi.org/10.1063/1.4914533
Kwon, J. -H., Kwak, W. -Y., Cho, B. K., E-mail: chobk@gist.ac.kr, Choi, H. Y., and Kim, G. H. 2015. "Effects of repetitive bending on the magnetoresistance of a flexible spin-valve". United States. https://doi.org/10.1063/1.4914533.
@article{osti_22410135,
title = {Effects of repetitive bending on the magnetoresistance of a flexible spin-valve},
author = {Kwon, J. -H. and Kwak, W. -Y. and Cho, B. K., E-mail: chobk@gist.ac.kr and Choi, H. Y. and Kim, G. H.},
abstractNote = {A positive magnetostrictive single layer (CoFe) and top-pinned spin-valve structure with positive magnetostrictive free (NiFe) and pinned (CoFe) layers were deposited on flexible polyethylene terephthalate film to investigate the changes in the magnetic properties in flexible environments, especially with a repetitive bending process. It was found that the stress, applied by repetitive bending, changes significantly the magnetic anisotropy of both layers in a single and spin-valve structure depending on the direction of applied stress. The changes in magnetic anisotropy were understood in terms of the inverse magnetostriction effect (the Villari effect) and the elastic recovery force from the flexibility of the polymer substrate. Repetitive bending with tensile stress transverse (or parallel) to the magnetic easy axis was found to enhance (or reduce) the magnetic anisotropy and, consequently, the magnetoresistance ratio of a spin-valve. The observed effects of bending stress in this study should be considered for the practical applications of electro-magnetic devices, especially magneto-striction sensor.},
doi = {10.1063/1.4914533},
url = {https://www.osti.gov/biblio/22410135}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {Thu May 07 00:00:00 EDT 2015},
month = {Thu May 07 00:00:00 EDT 2015}
}