A technique has been devised for measuring the saturation magnetization and anisotropy constants of ferrites and garnets. It uses a tiny sample of the ferromagnetic material in a dc magnetic field. The sample is surrounded by a small radio‐frequency coil, which determines the frequency of an oscillating circuit. As the dc magnetic field is swept through a range of values, the frequency of the rf oscillator changes and becomes a measure of the magnetization. The technique makes possible a simple, versatile instrument that would be equal or superior in accuracy to any other technique now known. However, it is not suitable for metals because of their conductivity.
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