Bloch lines are formed to reduce the magnetostatic energy generated by the Bloch walls in uniaxial magnets. Recently, it is reported that Bloch lines play important roles in the emergence and helicity reversal of magnetic bubbles in Sc-substitute M-type hexaferrites (BaFe12–x–0.05ScxMg0.05O19). Although Bloch lines have been discussed on the basis of micromagnetic simulations, the detailed structure was not observed directly. In this study, we investigated the microscopic structures of Bloch lines in BaFe10.35Sc1.6Mg0.05O19 uniaxial magnets. Differential-phase contrast scanning transmission microscopy directly revealed that the edges of the Bloch walls were misaligned in the Bloch lines of BaFe10.35Sc1.6Mg0.05O19. From the micromagnetic simulations based on the Monte-Carlo technique, we showed that the misaligned Bloch walls were caused by the dipole-dipole interactions in the hexaferrite. Our results will help to understand the microstructures of Bloch lines at a nanometer scale.
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Microscopic magnetization distribution of Bloch lines in a uniaxial magnet
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7 February 2019
Research Article|
February 01 2019
Microscopic magnetization distribution of Bloch lines in a uniaxial magnet
K. Kurushima
;
K. Kurushima
1
Toray Research Center
, Ohtsu, Shiga 520-8567, Japan
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K. Tanaka;
K. Tanaka
2
Department of Applied Physics, Waseda University
, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
3
Department of Nanoscience and Nanoengineering, Waseda University, Okubo, Shinjuku-ku
, Tokyo 169-8555, Japan
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H. Nakajima
;
H. Nakajima
4
Department of Materials Science, Osaka Prefecture University
, Sakai, Osaka 599-8531, Japan
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M. Mochizuki;
M. Mochizuki
2
Department of Applied Physics, Waseda University
, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
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S. Mori
S. Mori
4
Department of Materials Science, Osaka Prefecture University
, Sakai, Osaka 599-8531, Japan
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J. Appl. Phys. 125, 053902 (2019)
Article history
Received:
June 03 2018
Accepted:
January 08 2019
Citation
K. Kurushima, K. Tanaka, H. Nakajima, M. Mochizuki, S. Mori; Microscopic magnetization distribution of Bloch lines in a uniaxial magnet. J. Appl. Phys. 7 February 2019; 125 (5): 053902. https://doi.org/10.1063/1.5042678
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