Effect of Factors on Coercivity in Sr-La-Co Sintered Ferrite Magnets

We varied the composition and sintering temperature of Sr-La-Co ferrite magnets to analyze the effects of various important factors on coercivity ( H cJ ). We examined the effects of crystal grain size and distribution, the mechanism of magnetization reversal, the degree of crystal grain orientation...

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Bibliographic Details
Published in:	IEEE transactions on magnetics 2009-12, Vol.45 (12), p.5281-5288
Main Authors:	Nishio, H., Minachi, Y., Yamamoto, H.
Format:	Article
Language:	eng
Subjects:	Anisotropic magnetoresistance Anisotropy field Applied sciences Coercive force coercivity Cross-disciplinary physics: materials science rheology crystal grain orientation Equations Exact sciences and technology Ferrites Grain Grain size Magnetic analysis Magnetization reversal Magnets Materials science Metals. Metallurgy Other topics in materials science Physics Powder metallurgy. Composite materials Production techniques Shape measurement Sintered metals and alloys. Pseudo alloys. Cermets Sr-La-Co ferrite magnet Temperature
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Summary:	We varied the composition and sintering temperature of Sr-La-Co ferrite magnets to analyze the effects of various important factors on coercivity ( H cJ ). We examined the effects of crystal grain size and distribution, the mechanism of magnetization reversal, the degree of crystal grain orientation (OD), and the anisotropy field ( H A ) on H cJ . We proposed an equation based on the experimental results that expresses the measured H cJ and considers these effects as H cJ = C t (0.4/ R h ) OD ( H A - H d - H in ), where C t , R h , H d , and H in are the crystal grain size effects on H cJ of sintered magnet, rotational hysteresis integral corresponding to the mechanism of magnetization reversal, demagnetizing field of shape anisotropy, and interaction field between crystal grains, respectively. We found that apart from the volume ratio for single-domain crystal grains and H A , the mechanism of magnetization reversal had significant effects on H cJ for Sr-La-Co sintered ferrite magnets.
ISSN:	0018-9464 1941-0069