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

Research output: Contribution to journalArticlepeer-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 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.

Original languageEnglish
Article number7110339
JournalIEEE Transactions on Magnetics
Volume51
Issue number11
DOIs
Publication statusPublished - 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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