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 language | English |
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Pages (from-to) | 242-245 |
Number of pages | 4 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 155 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 1996 Jan 1 |
Event | Proceedings of the 1995 6th International Conference on Magnetic Recording Media, MRM - Oxford, UK Duration: 1995 Jul 16 → 1995 Jul 19 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics