Abstract
The features of the structure of domain walls in hexaferrite BaFe12O19 have been studied near the Curie temperature TC = 724 K. The studies have been performed on the single-crystal samples in ac magnetic field with frequencies of 73 MHz and 71 MHz, and in dc magnetic field in the range 0–0.25 kOe. In BaFe12O19 at temperature T1 = 716 K, the magnetic structure of domain walls is changed: the Bloch walls change into linear walls as temperature increases. The value of ΔT = TC – T1 ≈ 8 K. The physical mechanism considered in this work and determining the difference of temperature ranges of existence a magnetically ordered state and the temperature range of existence of the Bloch domain walls agrees with the experimental results. Estimation of the criterion of the Bloch domain wall transition to a linear wall at T1 = 716 K agrees with the obtained experimental data.
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Translated by Yu. Ryzhkov
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Bezlepkin, A.A., Kuntsevich, S.P. Domain Structure of Hexaferrite BaFe12O19 Near the Curie Temperature. Phys. Solid State 62, 1179–1182 (2020). https://doi.org/10.1134/S1063783420070045
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DOI: https://doi.org/10.1134/S1063783420070045