Dot size dependence of magnetization reversal process in L1 0-FePt dot arrays

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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The dot size dependence of the magnetization reversal process in perpendicularly magnetized L10-FePt dot arrays has been investigated in terms of minor loop measurement and magnetic domain observation. For the dots with diameters of 0.25 and 1 μm, the initial applied field (H satin) required to saturate the coercivity in the minor loop starting from the thermally demagnetized state is smaller than saturated coercivity (Hsatc), indicating a typical nucleation-type magnetization reversal process. For the dots with diameters of 2.3 and 5 μm, on the other hand, HHsatin is larger than H satc. The magnetic force microscopy images show that the field to wipe out domain walls increases with the dot size, which is consistent with minor loop measurements. The phenomenological analysis for the dots with diameters of 0.25 and 1μm indicates that irrespective of the dot size the annealing reduces the size of the defect regions and leads to the enhancement of the coercivity due to the recovery from the microfabrication damage.

Original languageEnglish
Pages (from-to)3464-3467
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number11 PART 2
Publication statusPublished - 2008 Nov


  • L1-FePt alloy
  • Magnetic domain structure
  • Magnetization reversal process
  • Microfabricated dot arrays


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