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Magnetic measurement of sintered Sr ferrite magnet in the hard-axis direction was executed, and it was found that the value of coercive force HcJ in hard-axis direction is much smaller than HcJD, which value is the deviation of dJ/dH on the hysteresis curve. The difference of HcJ and HcJD is compared and discussed in the demagnetization process phenomenon. The angular dependence of coercive force in all directions between θ=0 and 90 degree was also measured and observed.
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Hitoshi Yamamoto (2025) studied this question.
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