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Journal of Electron Microscopy 2005 54(supplement 1):i65-i68; doi:10.1093/jmicro/54.suppl_1.i65
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© The Author 2005. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oupjournals.org

Article

Ferromagnetic microstructure in double exchange manganites

S. Mori1,2,*, T. Asaka3, Y. Horibe1, Y. Matsui3 and K. Takenaka4

1 Department of Materials Science, CIAS, Osaka Prefecture University, Osaka 599-8531, Japan, 2 PRESTO, JST, Kita-kyusyu 808-0135, Japan, 3 Advanced Materials Laboratories, NIMS, Tsukuba 305-0044, Japan and 4 RIKEN, Wako, Saitama 351-0198, Japan

* To whom correspondence should be addressed. E-mail: smori{at}ms.cias.osakafu-u.ac.jp

Abstract

Ferromagnetic (FM) microstructures in double-exchange manganites, La0.825Sr0.175MnO3, were examined by low-temperature Lorentz microscopy. It was found that the FM domains with the stripe pattern were in the FM metallic phase of La0.825Sr0.175MnO3. The FM insulator phase induced by the substitution of Al ions for Mn in La0.825Sr0.175MnO3 was characterized as a complex mixture of the characteristic FM domains, which consists of three types of FM domains: the stripe domains, the plate-shaped domains and the complicated wavy domains. It is suggested that this mixture of different types of FM domains breaks the coherence of the electric conductivity and gives rise to the insulating character in Al doped La0.825Sr0.175MnO3.

Keywords     magnetic domains, Lorentz microscopy, manganites

Received     27 July 2004, accepted 15 October 2004


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