Atomic ordering and magnetic properties of polycrystalline Ll o-FePd dot arrays

J. G. Kang, J. G. Ha, J. H. Koh, S. M. Koo, M. Kamiko, S. Mitani, Y. Sakuraba, K. Takanashi, S. T. Bae, H. J. Yeom

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The polycrystalline Ll0-FePd (001) films considering a highly ordered dot array with various sizes have been successfully prepared by using a microfabrication process. The lateral size of square dots was changed in between 1 and 10 μm. The coercivity (Hc) of patterned L1 0-ordered FePd films was found to be slightly reduced compared to that of continuous ilm. Furthermore, Hc was slightly decreased after annealing at 500 °C. In the pinning mechanism, Hc can be determined by strong pinning sites for domain walls, which are the grain boundary regions in L1 0-ordered polycrystalline FePd ilms. These results indicate that the dot size dependence of Hc before and after annealing may be related to the pinning mechanism. The long-range ordering parameter (S) was increased after annealing. This demonstrates that post-annealing accelerates L10-FePd ordering, but there is no clear correlation between S and Hc.

Original languageEnglish
Pages (from-to)3149-3153
Number of pages5
JournalPhysica B: Condensed Matter
Volume405
Issue number15
DOIs
Publication statusPublished - 2010

Keywords

  • Atomic ordering
  • Coercivity
  • Dot array
  • FePd film
  • Llo-ordered polycrystalline

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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