Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers

Yuki Matsumoto; Satoshi Okamoto; Nobuaki Kikuchi; Osamu Kitakami; Yoshio Miura; Motohiro Suzuki; Masaichiro Mizumaki; Naomi Kawamura

doi:10.1109/TMAG.2015.2432074

Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers

Yuki Matsumoto, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Yoshio Miura, Motohiro Suzuki, Masaichiro Mizumaki, Naomi Kawamura

Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

In this paper, we report that W/Fe/W (001) epitaxial trilayer films exhibit very large negative uniaxial magnetic anisotropy K_u. The magnitude of K_u increases with decreasing the Fe layer thickness and also exhibits significant temperature dependence varying from-2.1 × 10⁷ erg/cc at 300 K to-3.5 × 10⁷ erg/cc at 10 K for the Fe layer thickness of 0.5 nm. The large negative K_u is attributable to interface magnetic anisotropy in nature at the W/Fe interface and can be quantitatively reproduced by the firstprinciples calculation. The X-ray magnetic circular dichroism measurement at room temperature has revealed that the interfacial W atom is polarized in antiparallel with the magnetic moment of Fe. The induced magnetic moment of the interfacial W is almost the half of the values obtained by the first-principles calculation and the previous experiment at low temperature. This small induced W moment may be ascribed to the significant temperature dependence of the negative K_u.

Original language	English
Article number	7110339
Journal	IEEE Transactions on Magnetics
Volume	51
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2015.2432074
Publication status	Published - 2015 Nov 1

Keywords

Fe/W
XMCD
epitaxial growth
interface magnetic anisotropy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2015.2432074

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title = "Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers",

abstract = "In this paper, we report that W/Fe/W (001) epitaxial trilayer films exhibit very large negative uniaxial magnetic anisotropy Ku. The magnitude of Ku increases with decreasing the Fe layer thickness and also exhibits significant temperature dependence varying from-2.1 × 107 erg/cc at 300 K to-3.5 × 107 erg/cc at 10 K for the Fe layer thickness of 0.5 nm. The large negative Ku is attributable to interface magnetic anisotropy in nature at the W/Fe interface and can be quantitatively reproduced by the firstprinciples calculation. The X-ray magnetic circular dichroism measurement at room temperature has revealed that the interfacial W atom is polarized in antiparallel with the magnetic moment of Fe. The induced magnetic moment of the interfacial W is almost the half of the values obtained by the first-principles calculation and the previous experiment at low temperature. This small induced W moment may be ascribed to the significant temperature dependence of the negative Ku.",

keywords = "Fe/W, XMCD, epitaxial growth, interface magnetic anisotropy",

author = "Yuki Matsumoto and Satoshi Okamoto and Nobuaki Kikuchi and Osamu Kitakami and Yoshio Miura and Motohiro Suzuki and Masaichiro Mizumaki and Naomi Kawamura",

note = "Publisher Copyright: {\textcopyright} 2015 IEEE.",

year = "2015",

month = nov,

day = "1",

doi = "10.1109/TMAG.2015.2432074",

language = "English",

volume = "51",

journal = "IEEE Transactions on Magnetics",

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T1 - Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers

AU - Matsumoto, Yuki

AU - Okamoto, Satoshi

AU - Kikuchi, Nobuaki

AU - Kitakami, Osamu

AU - Miura, Yoshio

AU - Suzuki, Motohiro

AU - Mizumaki, Masaichiro

AU - Kawamura, Naomi

PY - 2015/11/1

Y1 - 2015/11/1

N2 - In this paper, we report that W/Fe/W (001) epitaxial trilayer films exhibit very large negative uniaxial magnetic anisotropy Ku. The magnitude of Ku increases with decreasing the Fe layer thickness and also exhibits significant temperature dependence varying from-2.1 × 107 erg/cc at 300 K to-3.5 × 107 erg/cc at 10 K for the Fe layer thickness of 0.5 nm. The large negative Ku is attributable to interface magnetic anisotropy in nature at the W/Fe interface and can be quantitatively reproduced by the firstprinciples calculation. The X-ray magnetic circular dichroism measurement at room temperature has revealed that the interfacial W atom is polarized in antiparallel with the magnetic moment of Fe. The induced magnetic moment of the interfacial W is almost the half of the values obtained by the first-principles calculation and the previous experiment at low temperature. This small induced W moment may be ascribed to the significant temperature dependence of the negative Ku.

AB - In this paper, we report that W/Fe/W (001) epitaxial trilayer films exhibit very large negative uniaxial magnetic anisotropy Ku. The magnitude of Ku increases with decreasing the Fe layer thickness and also exhibits significant temperature dependence varying from-2.1 × 107 erg/cc at 300 K to-3.5 × 107 erg/cc at 10 K for the Fe layer thickness of 0.5 nm. The large negative Ku is attributable to interface magnetic anisotropy in nature at the W/Fe interface and can be quantitatively reproduced by the firstprinciples calculation. The X-ray magnetic circular dichroism measurement at room temperature has revealed that the interfacial W atom is polarized in antiparallel with the magnetic moment of Fe. The induced magnetic moment of the interfacial W is almost the half of the values obtained by the first-principles calculation and the previous experiment at low temperature. This small induced W moment may be ascribed to the significant temperature dependence of the negative Ku.

KW - Fe/W

KW - XMCD

KW - epitaxial growth

KW - interface magnetic anisotropy

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DO - 10.1109/TMAG.2015.2432074

M3 - Article

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SN - 0018-9464

VL - 51

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 11

M1 - 7110339

ER -

Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers

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Keywords

ASJC Scopus subject areas

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