THICKNESS DEPENDENCES OF HIGH-FREQUENCY MAGNETIC HYSTERESIS PROPERTIES IN SINGLE-CRYSTAL BARIUM HEXAFERRITE

Abstract

In this work we study the properties of hysteresis of ferro-magnetic resonance frequency-field dependence in the samples of barium hexaferrite. The purpose of the study is the experimental investigation into the properties of high-frequency magnetic hysteresis within the wide range of the samples thickness. The experimental investigation was carried out using EHF-spectroscopy technique. The field method is used to obtain a cylindrical domain structure. It was found that in thick samples (t > 100 μm) the transition to a saturated (single-domain) state occurs at lower values of the external magnetic field Hs, moreover, the dependence of this field on the thickness is close to the linear one. Furthermore, a similar dependence is observed for the field Hbr of the sample transition to a multi-domain state. At the same time, there is no strict dependence of the hysteresis value on the change in the thickness of the samples. The shift of the frequency-field dependence of the ferromagnetic resonance in the high-frequency region under the saturated state of thick samples of barium hexaferrite was detected. It was found that each investigated sample can be characterized by some average value of hysteresis different from the others.

Keywords

• barium hexaferrite
• ferromagnetic resonance
• high-frequency hysteresis
• single-crystal