Multi-domain resonance in textured Z-type hexagonal ferrite

The resonance frequency of a non-saturated Z-type hexagonal ferrite under a demagnetizing field effect was formulated. The permeabilities along the c-axis and the c-plane were measured by a specimen cut from the c-plane-textured Z-type ferrite, and the resonance frequency was measured as a mu '' peak. The resonance frequency measured from the permeability in the c-plane increases dramatically as the specimen's thickness increases. On the other hand, the resonance frequency measured from the permeability along the c-axis remains fairly constant. We tried to analyze the reason for the large difference in the resonance frequency depending on the crystal orientation using multi-domain resonance theory. As a result, the resonance frequency of a textured Z-type ferrite has been expressed when the high frequency magnetic field is parallel and normal to the c-plane. Therefore, it is confirmed that a demagnetizing field increases the resonance frequency, especially when the high frequency magnetic field is parallel to the c-plane. This result would contribute to the development a high performance inductance element. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3669369]