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Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer

Authors :
Kresna B. Fathoni
Yuya Sakuraba
Taisuke Sasaki
Yoshio Miura
Jin W. Jung
Tomoya Nakatani
Kazuhiro Hono
Source :
APL Materials, Vol 7, Iss 11, Pp 111106-111106-7 (2019)
Publication Year :
2019
Publisher :
AIP Publishing LLC, 2019.

Abstract

Although current in-plane giant magnetoresistance (CIP-GMR) is widely used as various magnetic field sensors, a higher magnetoresistance (MR) ratio is still required to improve their sensitivity and detectivity for certain applications. Here, we report dramatic enhancement of the MR ratio up to 26.5% in a spin valve device and 40.5% in an antiferromagnetically coupled trilayer device using fully epitaxial Co50Fe50/Cu/Co50Fe50 structures with metastable bcc-Cu spacer layers. Transmission electron microscopy analysis indicated that the metastable bcc-Cu had a perfect lattice match at the bcc-Co50Fe50/bcc-Cu interfaces. First-principles calculations showed good electronic band matching that induces a large spin asymmetry of the electron transmittance in the in-plane direction. The combination of this substantial lattice match and electronic band match is attributed to the large MR ratio, suggesting that exploring the use of metastable structure in ferromagnetic/nonferromagnetic multilayers will lead to further enhancement of CIP-GMR.

Details

Language :
English
ISSN :
2166532X
Volume :
7
Issue :
11
Database :
Directory of Open Access Journals
Journal :
APL Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.9789d12ea494491d988eb6cf0dc36bed
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5119370