한국자기학회지 (Journal of the Korean Magnetics Society)
- 제5권3호
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- Pages.216-221
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- 1995
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- 1598-5385(pISSN)
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- 2233-6648(eISSN)
자성분말의 보자력 분포도 측정방법과 그 응용
Meauring Method of Magnetic Particles' Coercivity Distribution and Its Applications
초록
자성분말의 보자력
Both manufacturing parameters and particles' chemical composition controll coercivity and its distribution of magnetic particles. The coercivity and its distribution are important properties for high density magnetic recording, so these are used as tool for evaluation of reproducibility of magnetic particles. We report in this paper the applications of dM/dH versus H curve, which is derived from magnetic hysteresis loop, to the evaluation of coercivity distribution of magnetic particles and oxidation studies of recording metal particles. The coercivity distri-bution can be estimated from the full width half rnaximun (FWHM) and the peak shape of the dM/dH versus H curve. The peak shape of the curve depends upon distribution of particles' coercivity. The peak of dM/dH versus H curve becomes broad and lor is splitted into two or rmre peaks. It depends on uniformity of particles' coercivity. When the coercivity difference between Ba-Ferrite and
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