A Simple Technique to Evaluate Hysteresis Parameters of Small Ferrite Samples

A novel simple technique to evaluate hysteresis parameters of miniature ferrite objects is presented. It is based on simultaneously applied sawtooth bias field and a low-intensity harmonic electromagnetic modulation signal of a few megahertz to magnetize a ferrite. An appearance of the output signal at the harmonics of the RF modulation frequency, when the bias field passes the hysteresis inflection points, allows for measuring the saturation magnetization. Also, in ferrite monocrystals, it is possible to evaluate the effective crystallographic anisotropy. Some experimental results are presented.