Journal
MICROSCOPY
Volume 65, Issue 6, Pages 473-478Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jmicro/dfw033
Keywords
Foucault imaging; Small-angle electron diffraction (SmAED); Lorentz microscopy; magnetic domains; magnetic deflection; perovskite manganese oxide
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [16H03833, 15K13306]
- Grants-in-Aid for Scientific Research [16H03833, 15K13306] Funding Source: KAKEN
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We report a method for acquiring Foucault images and small-angle electron diffraction patterns in external magnetic fields using a conventional transmission electron microscope without any modification. In the electron optical system that we have constructed, external magnetic fields parallel to the optical axis can be controlled using the objective lens pole piece under weak excitation conditions in the Foucault mode and the diffraction mode. We observe two ferromagnetic perovskite-type manganese oxides, La0.7Sr0.3MnO3 (LSMO) and Nd0.5Sr0.5MnO3, in order to visualize magnetic domains and their magnetic responses to external magnetic fields. In rhombohedral-structured LSMO, pinning of magnetic domain walls at crystallographic twin boundaries was found to have a strong influence on the generation of new magnetic domains in external applied magnetic fields.
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