Magnetic properties of perpendicularly orientated L10 FePt nanoparticles

Xiao Jing Mo, Hui Xiang, Guo Qing Li, Peng Chen, Zu Hong Xiong, Jun Zhong Wang, Shun Ji Ishio, Hitoshi Saito, Toshi Yuki Shima, Ko Ki Takanashi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


L10 FePt films were deposited on MgO (001) substrates heated to 700°C by magnetron sputtering. Assisted by the misfit of lattice between film and substrate, strong (001) texture was formed. The film at nominal thickness tN = 5 nm was composed of nanoparticles with a size of ~70 nm, and showed a high coercivity of ~105 kOe at 4.2 K. At tN =~50 nm, as the film changed from discontinuous to continuous, the coercivity dropped about one order of magnitude. Micromagnetic simulation implies that the magnetization reversal is a vortex-like nuclear type. The ideal coercivity of a separated single-domain L10 FePt nanoparticle with a size of 70 nm× 70 nm× 5 nm is ~121 kOe. This tells us that the experimental coercivity has nearly reached the limit of ideal single crystalline nanoparticles.

Original languageEnglish
Pages (from-to)680-686
Number of pages7
JournalChinese Science Bulletin
Issue number8
Publication statusPublished - 2010 Mar


  • Coercivity
  • L1 FePt nanoparticle
  • Magnetic domain
  • Magnetization reversal

ASJC Scopus subject areas

  • General


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