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

doi:10.1016/0304-8853(95)00747-4

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

Advanced Interdisciplinary Research Division

Research output: Contribution to journal › Conference article › peer-review

4 Citations (Scopus)

Abstract

In order to characterize intergranular magnetic coupling in (Co₈₆Cr₁₂Ta₂)_100-xPt_x (x = 0 and 9) and (Co_62.5Ni₃₀Cr_7.5)_100-xPt_x (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 H_c(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 H_c(T) with increasing T corresponds directly to the decrease in the magnetocrystalline anisotropy field of the grains, H_k^grain. In contrast, in CoCrTa media. H_c(T)/H_k^grain(T) gradually decreases with increasing T. This decrease in H_c(T)/H_k^grain(T) is suggested to be caused mainly by the increase in 4πM_s(T)/H_k^grain(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
Pages (from-to)	242-245
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	155
Issue number	1-3
DOIs	https://doi.org/10.1016/0304-8853(95)00747-4
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

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Intergranular magnetic coupling in CoNiCrPt and CoCrTaPt thin-film media characterized by the temperature dependence of the rotational hysteresis loss. / Shimatsu, T.; Djayaprawira, D. D.; Endo, A.; Iwata, N.; Takahashi, Migaku; Wakiyama, T.

In: Journal of Magnetism and Magnetic Materials, Vol. 155, No. 1-3, 01.01.1996, p. 242-245.

Research output: Contribution to journal › Conference article › peer-review

@article{3348eda0181344b29ad7aed32dee0017,

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

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.",

author = "T. Shimatsu and Djayaprawira, {D. D.} and A. Endo and N. Iwata and Migaku Takahashi and T. Wakiyama",

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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, Migaku

AU - Wakiyama, T.

PY - 1996/1/1

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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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