High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films

T. Shima, K. Takanashi, Y. K. Takahashi, K. Hono, G. Q. Li, S. Ishio

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

We have investigated the magnetic domains of high coercive FePt[001]/MgO[001] films with various morphologies by magnetic force microscopy (MFM). The film morphology changes from particulate to continuous depending on the film thickness (t), accompanied by a drastic decrease in coercivity when t exceeds the critical thickness, tc = 45 nm. The film with t = 10 nm is comprised of only single-domain particles of approximately 50 nm, which has a huge coercivity as high as 40kOe. The isolated particles larger than 200 nm are multi-domain, and the films containing these isolated particles show slightly lower coercivity. The coercivity drastically decreases with the percolation of the particles.

Original languageEnglish
Pages (from-to)171-177
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume266
Issue number1-2
DOIs
Publication statusPublished - 2003 Oct
Externally publishedYes

Keywords

  • FePt
  • Magnetic domain structure
  • Microstructure
  • Sputtering
  • Thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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