Exchange anisotropy of ferromagnetic/antiferromagnetic bilayers: Intrinsic magnetic anisotropy of antiferromagnetic layer and single spin ensemble model

Masakiyo Tsunoda, Migaku Takahashi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The origin of the magnetic anisotropy of the antiferromagnetic (AF) layer and the role of it in the magnetization process of exchange coupled ferromagnetic/antiferromagnetic bilayers are discussed. Through the magnetic torque analysis of a pseudo-single crystalline Ni-Fe/Mn-Ni bilayer and a polycrystalline Ni-Fe/Mn-Ir bilayer, the magnetocrystalline anisotropy of the antiferromagnet is strongly suggested to be the origin of the magnetic anisotropy of the antiferromagnetic (AF) layer. The single spin ensemble model is newly introduced for polycrystalline bilayers, taking into account the two-dimensionally random distribution of the magnetic anisotropy axes of the AF grains. The mechanism of a well-known experimental fact, the reversible induction of the exchange anisotropy along desirable directions by field cooling procedure, is successfully elucidated with the new model.

Original languageEnglish
Pages (from-to)149-153
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume239
Issue number1-3
DOIs
Publication statusPublished - 2002 Feb 1

Keywords

  • Exchange anisotropy
  • Exchange bias
  • Magnetocrystalline anisotropy
  • Pseudo single crystal
  • Single spin ensemble model
  • Unidirectional anisotropy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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