TY - JOUR
T1 - Intergranular magnetic coupling in CoNiCrPt and CoCrTaPt thin-film media characterized by the temperature dependence of the rotational hysteresis loss
AU - Shimatsu, T.
AU - Djayaprawira, D. D.
AU - Endo, A.
AU - Iwata, N.
AU - Takahashi, M.
AU - Wakiyama, T.
N1 - Funding Information:
ACKNOWLEDGEMENTS We thank Dr R. Newland, Mr A. Smith and the staff of the Department of Anatomical Pathology for the preparation of the sections and photography of the slices. This study was supported by a grant from the Department of Veterans' Affairs, Australia.
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
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U2 - 10.1016/0304-8853(95)00747-4
DO - 10.1016/0304-8853(95)00747-4
M3 - Conference article
AN - SCOPUS:0030562843
SN - 0304-8853
VL - 155
SP - 242
EP - 245
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 1-3
T2 - Proceedings of the 1995 6th International Conference on Magnetic Recording Media, MRM
Y2 - 16 July 1995 through 19 July 1995
ER -