Mechanism of magnetization process of island-like L10 FePt films

Guoqing Li, Hideaki Takahoshi, Hirotaka Ito, Takahiro Washiya, Hitoshi Saito, Shunji Ishio, Toshiyuki Shima, Koki Takanashi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

L10 FePt films composed of separated island-like particles with a size distribution were epitaxially deposited on MgO (0 0 1) substrate at 780 °C. The most probable size of particle at nominal thickness t N=25 nm is 10 times as big as that at tN=5 nm.Most of the as-deposited particles are single-domain at tN=5 nm, and the majority are multi-domain at tN=25 nm.Out-of-plane coercivity is ∼50 kOe at tN=25 nm.A peculiar asymmetric initial magnetization process against the direction of applied perpendicular field was imaged by an in-field magnetic force microscope (MFM). At +6 kOe, a few particles were kept as multi-domain structures as long as the majority became saturated; however, they became saturated only at -1 kOe. High coercivity is attributed to a wide distribution of nucleation field HN ranging from 20 to 70 kOe.

Original languageEnglish
Pages (from-to)219-223
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume287
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2005 Feb 1

Keywords

  • Coercivity
  • Domain structure
  • L1 FePt film
  • Magnetic force microscopy
  • Magnetization process

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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