Intergranular magnetic coupling in CoNiCrPt and CoCrTaPt thin-film media characterized by the temperature dependence of the rotational hysteresis loss

T. Shimatsu, D. D. Djayaprawira, A. Endo, N. Iwata, Migaku Takahashi, T. Wakiyama

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

In order to characterize intergranular magnetic coupling in (Co86Cr12Ta2)100-xPtx (x = 0 and 9) and (Co62.5Ni30Cr7.5)100-xPtx (x = 0 and 14) thin-film recording media, the temperature dependence of the rotational hysteresis loss has been examined. In all media, the coercive force Hc(T) gradually decreases to about half the value attained at 25°C by increasing the measuring temperature T to about 300°C without a change in the microstructure. In CoNiCr, CoNiCrPt and CoCrTaPt media, the decrease in Hc(T) with increasing T corresponds directly to the decrease in the magnetocrystalline anisotropy field of the grains, Hkgrain. In contrast, in CoCrTa media. Hc(T)/Hkgrain(T) gradually decreases with increasing T. This decrease in Hc(T)/Hkgrain(T) is suggested to be caused mainly by the increase in 4πMs(T)/Hkgrain(T). This means that the intergranular magnetostatic coupling strongly affects the magnetic properties of the CoCrTa media examined here due to the low intergranular exchange coupling.

Original languageEnglish
Pages (from-to)242-245
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume155
Issue number1-3
DOIs
Publication statusPublished - 1996 Jan 1
EventProceedings of the 1995 6th International Conference on Magnetic Recording Media, MRM - Oxford, UK
Duration: 1995 Jul 161995 Jul 19

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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