Grain-size effects on microwave ferrite magnetic properties

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Abstract
A general review is given on effects and controls of grain size, so far documented, concerning both soft and microwave ferrites, while referring to the findings of ceramists as well as to the representative models available for initial permeability spectra and for microwave parameters, such as ΔHk and ΔHeff. As an illustrative example, a briefing is given on narrow linewidth CaV‐garnet families, finding an ever‐increasing usage, with reduced loss resulting from the grain size being intentionally increased.