Abstract
Bitter pattern observations were used to investigate the relationship between the applied field and wall velocity in a polycrystalline manganese-magnesium ferrite. The wall velocity was found to lie in the range 500 to 1000 cm sec-1 (effective Oe)-1 and the motion of the wall was shown to be impeded by Neel spike domain structures around pores in the material. The quasi-static nucleation and reversal process was also investigated: it was found that after saturation nuclei of reverse magnetization appeared on pores on the grain boundary, which evolved into trapezoidal domain structures. Nucleation appeared to play no part in the low field (±3 Oe) reversal process.
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