Crystallographic structures and magnetic properties of L10-type FePt nanoparticle monolayered films stabilized on functionalized surfaces

Y. Sasaki, M. Mizuno, Andrew C.C. Yu, M. Inoue, K. Yazawa, I. Ohta, Migaku Takahashi, B. Jeyadevan, K. Tohji

研究成果: Conference article査読

17 被引用数 (Scopus)

抄録

Crystallographic structures and magnetic properties of chemically synthesized FePt nanoparticles, which were firmly stabilized into a monolayer on thermally oxidized Si substrate using 3-amino propyldimethylethoxysilene, were studied. The two-dimensional structure of FePt nanoparticles was confirmed by plan-view high-resolution scanning microscopy observation. The particles transformed from fcc to highly ordered L10 structure by annealing at 800°C under high vacuum with minimal coalescence. From rotational hysteresis loss analysis, a large magnetic anisotropy field of over 80kOe for the 800°C-annealed film was estimated. The coercivity of the annealed sample was very small and of the order of 102Oe at room temperature, meanwhile, the remanence coercivity obtained from DC demagnetization measurement was over 11kOe. This large difference was resulted from the co-existence of Fe-poor particles with different low anisotropy fields in the monolayered film.

本文言語English
ページ(範囲)122-126
ページ数5
ジャーナルJournal of Magnetism and Magnetic Materials
282
1-3
DOI
出版ステータスPublished - 2004 11
イベントInternational Symposium on Advanced Magnetic Technologies - Taipei, Taiwan, Province of China
継続期間: 2003 11 132003 11 16

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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