Anisotropy and microstructure analysis by magnetic measurement

Analysis of digital data from the approach-to-saturation region of the hysteresis loop has been made convenient through the use of a microprocessor-controlled hysteresigraph. To evaluate microstructure and magnetocrystalline anisotropy effects on the high field part of the magnetization curve three analysis techniques are considered. For the situation where magnetic saturation is incomplete, the theory is modified in a manner which permits the determination of the a and b coefficients of the approach-to-saturation equation from the intercept and slope of a single curve. With each method, experimental results yielded reasonably accurate estimates of the effective porosity and anisotropy fields from a variety of polycrystalline magnetic materials.