In this report, we have introduced three topics of thick film magnets. After reviewing the development of sputtering fabricated anisotropic Nd Fe B thick film magnets together with the outstanding investigations on other thick film magnets prepared by several deposition methods, the latest experimental results on PLD made isotropic Nd Fe B thick film magnets are also reviewed.
Magnetization reversal process of Nd Fe B sintered magnets was simulated based on the micromagnetic theory under consideration of the magnetostatic interaction and the cooperative effect of many grains. Reversal of magnetization was nucleated from magnetically soft grains. Then, the reversed region grew in the direction of applied field, and spread into the whole magnet when the applied field exceeded a critical value. The coercivity was decreased significantly by the existence of a small amount of magnetically soft grains, and did not depend on their fraction. Nonmagnetic inclusions between Nd 2 Fe 14 B grains also initiated magnetization reversal and decreased the coercivity. These effects of magnetostatic interaction were especially significant for the magnets with well aligned grain orientation, and limited the obtainable coercivity to approximately 0.7 of the anisotropy field even if the magnet was consisted of perfect grains segregated from each other.
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