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Journal of Electron Microscopy Advance Access originally published online on January 17, 2007
Journal of Electron Microscopy 2007 56(1):7-16; doi:10.1093/jmicro/dfl042
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

In situ observations of domain structures and magnetic flux distributions in Mn-Zn and Ni-Zn ferrites by Lorentz microscopy and electron holography

Takehiro Kasahara1, Daisuke Shindo1,*, Hideyuki Yoshikawa2, Takafumi Sato2 and Koichi Kondo2

1 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 1-1 Katahira, 2-Chome, Aobaku, Sendai 980-8577, Japan
2 Research and Development Unit, NEC Tokin Corporation 6-7-1 Koriyama, Taihaku-ku, Sendai 982-8510, Japan

*To whom correspondence should be addressed. E-mail: shindo{at}tagen.tohoku.ac.jp

Domain structures and magnetic flux distributions in Mn-Zn and Ni-Zn ferrites are investigated by in situ observations with Lorentz microscopy and electron holography. In situ Lorentz microscopic observation with the magnetic field applied reveals that the domain walls in Mn-Zn ferrite move easily across the grain boundary. On the other hand, each grain of Ni-Zn ferrite is magnetized by domain wall motion inside the grain. By taking a series of holograms with adjustment of the optical axis and astigmatism while the magnetic field is applied, we succeeded in observing the change in magnetic flux distribution quantitatively. Eventually, it is clarified that magnetization rotation does not take place in the magnetization process of Ni-Zn ferrite. The domain wall widths {delta} in Mn-Zn and Ni-Zn ferrites are evaluated to be 73 and 58 nm, respectively. Furthermore, through direct observation of the domain structure in Ni-Cu-Zn ferrite with Lorentz microscopy, it is found that the grains with size below 1.5 µm diameter are single domain.

Keywords     electron holography, domain wall motion, magnetic flux, ferrite, Lorentz microscopy, in situ observation

Received     31 August 2006, accepted 22 December 2006


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