Magnetocrystalline anisotropy behavior in the multiferroic BiMnO3 examined by Lorentz transmission electron microscopy

We investigated magnetic domain structures of a multiferroic manganite, BiMnO3, by Lorentz transmission electron microscopy. Ferromagnetic domains were observed below similar to 105 K, close to the ferromagnetic Curie temperature, TC. The spontaneous magnetization aligns distinctly along the [010] d...

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Bibliographic Details
Published in:Applied physics letters 2012-07, Vol.101 (5)
Main Authors: Asaka, T, Nagao, M, Yokosawa, T, Kokui, K, Takayama-Muromachi, E, Kimoto, K, Fukuda, K, Matsui, Y
Format: Article
Language:English
Subjects:
Anisotropy
Curie temperature
Electron microscopy
Ferromagnetism
Magnetic domains
Manganites
Twin boundaries
Walls
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Summary:We investigated magnetic domain structures of a multiferroic manganite, BiMnO3, by Lorentz transmission electron microscopy. Ferromagnetic domains were observed below similar to 105 K, close to the ferromagnetic Curie temperature, TC. The spontaneous magnetization aligns distinctly along the [010] direction, suggesting that the magnetic easy direction is along the b axis. Inflection and merging of the domain walls was observed at twin boundaries. This indicates pinning of the magnetic domain walls at crystallographic twin boundaries. Furthermore, we observed narrow magnetic domain walls, suggesting strong magnetocrystalline anisotropy.
ISSN:0003-6951
DOI:10.1063/1.4742747