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

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...

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Main Authors: Kresna B. Fathoni, Yuya Sakuraba, Taisuke Sasaki, Yoshio Miura, Jin W. Jung, Tomoya Nakatani, Kazuhiro Hono
Format: Article
Language:English
Published: AIP Publishing LLC 2019-11-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/1.5119370
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spelling doaj-9789d12ea494491d988eb6cf0dc36bed2020-11-25T01:31:54ZengAIP Publishing LLCAPL Materials2166-532X2019-11-01711111106111106-710.1063/1.5119370Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacerKresna B. Fathoni0Yuya Sakuraba1Taisuke Sasaki2Yoshio Miura3Jin W. Jung4Tomoya Nakatani5Kazuhiro Hono6Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, JapanAlthough 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.http://dx.doi.org/10.1063/1.5119370
collection DOAJ
language English
format Article
sources DOAJ
author Kresna B. Fathoni
Yuya Sakuraba
Taisuke Sasaki
Yoshio Miura
Jin W. Jung
Tomoya Nakatani
Kazuhiro Hono
spellingShingle Kresna B. Fathoni
Yuya Sakuraba
Taisuke Sasaki
Yoshio Miura
Jin W. Jung
Tomoya Nakatani
Kazuhiro Hono
Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer
APL Materials
author_facet Kresna B. Fathoni
Yuya Sakuraba
Taisuke Sasaki
Yoshio Miura
Jin W. Jung
Tomoya Nakatani
Kazuhiro Hono
author_sort Kresna B. Fathoni
title Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer
title_short Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer
title_full Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer
title_fullStr Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer
title_full_unstemmed Band match enhanced current-in-plane giant magnetoresistance in epitaxial Co50Fe50/Cu multilayers with metastable bcc-Cu spacer
title_sort band match enhanced current-in-plane giant magnetoresistance in epitaxial co50fe50/cu multilayers with metastable bcc-cu spacer
publisher AIP Publishing LLC
series APL Materials
issn 2166-532X
publishDate 2019-11-01
description 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.
url http://dx.doi.org/10.1063/1.5119370
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