Analysis of the complex permeability of monocrystalline MnZnFeII ferrite

Abstract A method of analysis is discussed by means of which the domain wall susceptibility and rotational susceptibility of monocrystalline MnZn ferrite can be distinguished. It is based upon a measurement of the frequency dependence of the disaccommodation occurring in the ferrite. From this analysis it appears that below 1 MHz the domain wall motion is the dominating magnetization process in MnZn ferrite, whereas above 3 MHz the rotational susceptibility prevails. Between 1 and 3 MHz, μ′ and μ″ are determined mainly by the rotational- and wall-susceptibility, respectively. Hence, when applied in magnetic video heads, the ferrite may generate electrical noise as a result of the dissipation accompanying the wall motion.