Structure and magnetism of hcp-Co fine particles

H. Sato, Osamu Kitakami, T. Sakurai, Y. Shimada, Y. Otani, K. Fukamichi

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)

Abstract

We have synthesized hcp-Co fine particles with the average diameter of less than 50 nm by sputtering Co in a somewhat high inert gas pressure. A nearly perfect hcp phase can be stabilized by increasing sputtering gas pressure and decreasing sputtering power in contrast to conventional preparation conditions. Magnetic measurements have revealed the clear relation of coercivity with the volume ratio of hcp phase. That is, the increase in the hcp phase considerably enhances the coercivity. Appearance of the hcp phase seems to be related to the promotion of allotropic phase transformation in Co initiated by lattice defects within each particle.

Original languageEnglish
Pages (from-to)1858-1862
Number of pages5
JournalJournal of Applied Physics
Volume81
Issue number4
DOIs
Publication statusPublished - 1997 Feb 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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