Relaxation of complex susceptibility of ferrites in AC magnetic field

Abstract

The relaxation of the complex magnetic susceptibility in ferrites depending on temperature, frequency of the ac magnetic field, the concentration of relaxators, and the time which is passed after sample demagnetization (disaccomodation) is discussed. A strict solution of Neel's equation for the motion of a domain wall is found. Various asymptotic approximations of general solution are evaluated and compared with the results of other authors. The conclusions from the solution obtained, in particular, disaccomodation of the imaginary component of the susceptibility are discussed. It is demonstrated that under specific conditions disaccomodation of the imaginary component of the susceptibility differs from that of its real component.