Research Opportunities for Materials with Ultrafine Microstructures (1989) / Chapter Skim
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From page 93... ...
The presence of the submicron intergranular phase shuts off the shortrange intergrain ferromagnetic exchange interactions by effectively isolating the grains from magnetic interactions with each other. When the intergranular phase is absent, ferromagnetic exchange couples the magnetizations of the two grains at their surfaces, leading to significant enhancement of the remanent magnetization of all the grains.
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From page 94... ...
In permanent magnets with this type of microstructure, it is believed that magnetic domain walls are pinned in the amorphous grain boundary regions, thus generating coercity. The submicron microstructure shown in Figure 29 has no amorphous intergranular phase.
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