Magnetic anisotropy and switching field of spindle-shaped metal particles for particulate recording media

M. Igaki, H. Nagamori, T. Shimatsu, Migaku Takahashi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The difference of magnetic properties between spindle- and needle-shaped metal particles, which have almost the same thickness of about 17-27 nm, is discussed through a magnetic torque analysis for particulate films made of these metal particles. The effective magnetic anisotropy field of particles Hptck(eff) are 6.3 and 6.5 kOe (averaged values), respectively, for spindle- and needle-shaped metal particles, showing no significant difference. Because of the interparticulate magnetostatic coupling, these Hptck(eff) values are estimated to be about 1 kOe smaller than intrinsic values of shape anisotropy field. Saturation magnetization Ms in both kinds of metal particles is found to show almost the same value of about 1300 emu/cm3. However, the switching field HEAr normalized by Hptck(eff) of the spindle-shaped particles is about 10-15% larger than that of the needle-shaped particles. Furthermore, the value of SFD of the spindle-shaped particles is about 20% smaller than that of the needle-shaped particles. The values of HEAr/Hptck(eff) and rotational hysteresis loss Rh in both kinds of metal particles are strongly related to the thickness of particles, however, significant differences in these relations between spindle- and needle-shaped metal particles were not observed.

Original languageEnglish
Pages (from-to)209-219
Number of pages11
JournalJournal of Magnetism and Magnetic Materials
Volume183
Issue number1-2
DOIs
Publication statusPublished - 1998 Mar 7

Keywords

  • Anisotropy
  • Coercivity
  • Magnetic recording media - participate
  • Particle thickness size
  • Switching field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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