Phenomenological analysis of magnetization reversal process for L 10 -FePt (001) particulate films

Dongling Wang, Takeshi Seki, Koki Takanashi, Toshiyuki Shima, Gouqing Li, Hitoshi Saito, Shunji Ishio

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The magnetization reversal processes for L 10 -FePt (001) particulate films before and after Ar ion irradiation were experimentally investigated, and the size of the defect region (2 r0) and the effective demagnetization factor (Neff) were evaluated based on a phenomenological analysis. A large coercivity (Hc) of 30.4 kOe, which originates from the particulate structure, drastically reduced after ion irradiation. The phenomenological analysis showed the increase of 2 r0 by irradiating Ar ions, which clearly indicates that Hc is closely related with the size of 2 r0. In addition, the FePt particulate films show large Neff, which may arise from the large dipole interaction between particles and the distribution of particle sizes and shapes.

Original languageEnglish
Article number07A702
JournalJournal of Applied Physics
Issue number7
Publication statusPublished - 2009


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