Systematic study for magnetization dependence of exchange anisotropy strength in Mn-Ir/FM (FM=Ni-Co, Co-Fe, Fe-Ni) bilayer system

Masakiyo Tsunoda, Hirokazu Takahashi, Migaku Takahashi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The unidirectional anisotropy constant, Jk, of the Mn 76 Ir24/FM (FM=Ni-Co, Co-Fe, Fe-Ni) bilayers was investigated, systematically changing the FM layer composition. On the (111)-oriented face centered cubic (fcc) Mn-Ir layer, the FM layers were grown in the respective crystal structure, corresponding to their composition. The phase boundaries between fcc and body centered cubic (bcc) structures existed around Co80 Fe20 and Fe70 Ni30, roughly corresponding to those in the bulk binary alloy systems. The saturation magnetization, of the FM layer showed a broad peak around Fe60 Co40 and a shallow dip at Fe Ni, corresponding well with the Slater-Pauling curve of bulk alloys. On the other hand, the Jk reached a maximum around Co70Fe30 and showed different variation from that of the Ms against the FM layer composition. Therefore, the correlation plot between Jk and Ms did not provide any clear relationship. From the experimental results, we found a general feature that bcc structured FM layers are more likely to induce strong exchange anisotropy than fcc structured FM layers.

Original languageEnglish
Article number5257094
Pages (from-to)3877-3880
Number of pages4
JournalIEEE Transactions on Magnetics
Volume45
Issue number10
DOIs
Publication statusPublished - 2009 Oct 1

Keywords

  • Body centered cubic structure
  • Compositional dependence
  • Exchange bias
  • Mn-Ir
  • Saturation magnetization
  • Unidirectional anisotropy constant

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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