Abstract: Comparing to a paramagnetic sample, the signal of magnetic resonance of a ferromagnetic sample not only is much stronger, but also reflects many characteristics of ferromagnetic resonance (FMR) spectra. Such as, the FMR spectra are different between virgin magnetization and magnetization with remanence M_r. Barkhausen jumps is characterized by FMR spectrum in virgin magnetization. The FMR can also be used to study anisotropy of magnetocrystal, shape anisotropy, and magnetic phase transition of ferromagnetism-high temperature paramagnetism, etc.

Key words: Ferromagnetic resonance, Virgin magnetization, Barkhausen jumps, Magnetic anisotropy, Magnetic phase transition