Large lattice mismatch induced perpendicular magnetic anisotropy and perpendicular exchange bias in CoPt/FeMn bilayer films

Chun Jiao Pan, Teng Hua Gao, Nobuhide Itogawa, Takashi Harumoto, Zheng Jun Zhang, Yoshio Nakamura, Ji Shi

Research output: Contribution to journalArticle

Abstract

Perpendicular magnetic anisotropy and perpendicular exchange bias of CoPt/FeMn bilayers fabricated by dc magnetron sputtering were investigated in this work. Magnetic anisotropy, showing strong dependence on thickness of CoPt layer, changes from perpendicular magnetic anisotropy (PMA) into in-plane magnetic anisotropy when CoPt layer is thicker than 4.5 nm. The evolution of internal stress with thickness, from tensile to compressive, has been analyzed by sin2ψ method using an equal biaxial stress model. Distinctive perpendicular exchange bias (PEB) has been successfully established due to PMA of CoPt and out-of-plane spin component of 3Q-spin-structured FeMn. FeMn thickness dependence of exchange bias field has been systematically investigated.

Original languageEnglish
Pages (from-to)2009-2013
Number of pages5
JournalScience China Technological Sciences
Volume62
Issue number11
DOIs
Publication statusPublished - 2019 Nov 1

Keywords

  • magnetic materials
  • perpendicular exchange bias
  • perpendicular magnetic anisotropy
  • X-ray technique

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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