Semiconductor Physics, Quantum Electronics & Optoelectronics, 21 (4), P. 402-406 (2018).

Domain structure regularization in monocrystalline barium hexaferrite
A.L. Nikytenko, V.I. Kostenko, V.I. Grygoruk, V.F. Romaniuk

Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., 01033 Kyiv, Ukraine

Abstract. Conditions for regular domain structure formation in a monocrystalline barium hexaferrite plate have been studied experimentally. The purpose of the work was to develop a simple and, at the same time, an effective method of regularizing the cylindrical domain structure in these plates. The cylindrical domain structure was created by the field method, and its visualization was carried out using the Faraday effect. Radiophysical method of microwave spectroscopy was used to study characteristics of the spectra of magnetostatic oscillations, which are uniquely related to the type and quality of the formed domain structure. The method of cylindrical domain structure regularization in monocrystalline barium hexaferrite has been proposed, which is based on applying a constant fixed magnetic field along the easy magnetization axis. It has ascertained that the optimal value of regularization field lies within the range of 3.3...3.6 kOe. However, with the fields exceeding 3.6 kOe, the cylindrical domain structure is significantly distorted. It was found out that the proposed method allows increasing the intensity of the most high-frequency domain magnetostatic resonance by more than 4.5 dB.

Keywords: barium hexaferrite, domain structure, single-crystal, magnetostatic oscillations

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