Microstructure significantly affects the magnetic and electrical properties of ferrites. Domain behavior and its relation to microstructure of magnetic materials are reviewed, and the critical grain size necessary to maintain a single domain in nickel ferrite is calculated. Experimental data are given for BaO. 6Fe 2 O 3 and NiFe 2 O 4 to show the relations among grain sue, coercive force, permeability, ferromagnetic resonance line width (ΔH) , and dielectric losses. Predictions are made for the role of ferrites in the future of ceramic research.
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S. L. Blum (1958) studied this question.
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