Observation on <i>H<sub>c</sub></i><i><sub>J</sub></i> and <i>H<sub>c</sub></i><i><sub>JD</sub></i> of Sintered Ferrite Magnet in the Hard-Axis Direction

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.