Perpendicular exchange bias independent of NiO layer thickness in NiO/CoPt structures with orthogonal spin configuration

Ying Gao, Hiroto Sakimura, Hangxian Gao, Tenghua Gao, Jian Wang, Kazuya Ando, Takashi Harumoto, Yoshio Nakamura, Ji Shi

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We report on an investigation of the orthogonal coupling system of a NiO/CoPt bilayer on a Pt(111)/glass substrate, with CoPt showing strong perpendicular magnetic anisotropy. This system displays a favorable perpendicular exchange bias with an exchange bias field as high as-900 Oe, exceeding most of the results reported so far from various NiO/FM exchange coupling systems. In contrast to the general bottom-pinned stacking sequence, in this research we placed an antiferromagnetic layer on top of a ferromagnetic layer; an interesting new phenomenon was observed-the loop shift amplitude does not change with the thickness of the antiferromagnet, which is explained in detail by modeling and computing. We demonstrate a modified random field model by applying Malozemoff's assumption to a 'spin flop' coupling system, in which interface roughness plays a crucial role. A simulation on the basis of the random field model agrees well with the experimental observations.

本文言語English
論文番号225002
ジャーナルJournal of Physics D: Applied Physics
53
22
DOI
出版ステータスPublished - 2020 5 27

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 音響学および超音波学
  • 表面、皮膜および薄膜

フィンガープリント

「Perpendicular exchange bias independent of NiO layer thickness in NiO/CoPt structures with orthogonal spin configuration」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル