We have investigated the effects of the number of repetition (N) of ferromagnetic/nonmagnetic bilayers on the magnetic property and current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) in [Co2Fe(Al0.5Si0.5) (CFAS)/Ag]N multilayer for a potential magnetic field sensor application. The antiferromagnetic interlayer exchange coupling (AFM-IEC) between CFAS layers through the Ag(2.1 nm) spacer realized an anti-parallel magnetization configuration between the adjacent CFAS layers with N up to 6, which led to the stable linear response of magnetoresistance (MR) against a magnetic field in the range of 60-70 mT. The resistance change-area product (ΔRA) and the MR ratio were monotonically increased with N from 6.6 mΩ μm2 and 16% for N = 1 (CFAS/Ag/CFAS trilayer) to 23 mΩ μm2 and 43% for N = 6, respectively, giving an enhancement of field sensitivity with N up to 4.5%/mT. We also found nearly 3 times smaller non-linearity (1.2% Full Scale) in the device with N = 6 compared to that with N = 1. This study suggests a potential of Heusler-alloy based multilayer CPP-GMR device having AFM-IEC for magnetic field sensor applications.
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High magnetic field sensitivity in anti-ferromagnetically coupled 001-epitaxial [Co2Fe(Al0.5Si0.5)/Ag]N multilayers
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28 October 2018
Research Article|
October 30 2018
High magnetic field sensitivity in anti-ferromagnetically coupled 001-epitaxial [Co2Fe(Al0.5Si0.5)/Ag]N multilayers
T. Shiroyama;
T. Shiroyama
1
National Institute for Materials Science
, Tsukuba 305-0047, Japan
2
Graduate School of Pure and Applied Sciences, University of Tsukuba
, Tsukuba 305-0047, Japan
3
LG Japan Lab Inc.
, Tokyo 140-0002, Japan
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Y. Sakuraba;
Y. Sakuraba
a)
1
National Institute for Materials Science
, Tsukuba 305-0047, Japan
a)Author to whom correspondence should be addressed: SAKURABA.Yuya@nims.go.jp
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T. Nakatani;
T. Nakatani
1
National Institute for Materials Science
, Tsukuba 305-0047, Japan
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H. Sepehri-Amin
;
H. Sepehri-Amin
1
National Institute for Materials Science
, Tsukuba 305-0047, Japan
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J. W. Jung;
J. W. Jung
1
National Institute for Materials Science
, Tsukuba 305-0047, Japan
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K. Hono
K. Hono
1
National Institute for Materials Science
, Tsukuba 305-0047, Japan
2
Graduate School of Pure and Applied Sciences, University of Tsukuba
, Tsukuba 305-0047, Japan
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a)Author to whom correspondence should be addressed: SAKURABA.Yuya@nims.go.jp
J. Appl. Phys. 124, 163910 (2018)
Article history
Received:
July 18 2018
Accepted:
September 19 2018
Citation
T. Shiroyama, Y. Sakuraba, T. Nakatani, H. Sepehri-Amin, J. W. Jung, K. Hono; High magnetic field sensitivity in anti-ferromagnetically coupled 001-epitaxial [Co2Fe(Al0.5Si0.5)/Ag]N multilayers. J. Appl. Phys. 28 October 2018; 124 (16): 163910. https://doi.org/10.1063/1.5048931
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