Effect of chemical ordering on 90°interlayer coupling in epitaxial Co-Fe/Cr/Co-Fe thin films

S. Bosu, Y. Sakuraba, K. Saito, K. Izumi, T. Koganezawa, K. Takanashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Interlayer exchange coupling (IEC) was studied in ferromagnetic binary alloy Co-Fe thin films through Cr spacer to investigate systematically, the effects of chemical compositions and the chemical ordering on the observation of 90° interlayer coupling in magnetic alloy based structures. The dominating 180° coupling with weak 90° coupling was observed at room temperature deposited CoxFe1-x/Cr/CoxFe1-x (x=0 to 0.8) trilayer samples for all values of x. However, the strength of the 90° coupling for x=0.4 and 0.5 was found to increase with increasing the annealing temperature, Tann for the bottom CoxFe 1-x layer and the strength of 90° coupling became comparable to that of 180° coupling at Tann=400 °C. The enhancement of 90° coupling was considered to be originated from the unconventional interfacial magnetic exchange interactions between Cr and Co (and Fe) due to the appearance of antiphase structures at the interface with the enhancement of chemical ordering (B2 ordering) which was confirmed by synchrotron X-ray diffraction.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume369
DOIs
Publication statusPublished - 2014 Nov

Keywords

  • B2 ordering
  • Binary alloy Co-Fe
  • Interlayer exchange coupling

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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