Magnetization distribution in Nd4.5Fe77B 18.5 nanocomposite magnets studied by electron holography

Y. G. Park; D. Shindo; H. Kanekiyo; S. Hirosawa

doi:10.1063/1.1829382

Magnetization distribution in Nd_4.5Fe₇₇B _18.5 nanocomposite magnets studied by electron holography

Y. G. Park, D. Shindo, H. Kanekiyo, S. Hirosawa

Center for Advanced Microscopy and Spectroscopy

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Magnetic nanostructures at demagnetized and remanent states in Nd _4.5Fe₇₇B_18.5 nanocomposite magnets are investigated by electron holography, utilizing the specially designed electromagnet. The quantitative mapping of magnetization distribution at a nanometer scale using a polar diagram has been reported for both the demagnetized and remanent states. Through the polar diagrams for the remanent state, the homogeneous distribution of magnetic flux is found in the specimen annealed at a low temperature, while the fluctuated distribution is found in the specimen annealed at a high temperature. The difference is considered to be responsible for their magnetic properties, i.e., remanence and coercivity.

Original language	English
Article number	3
Pages (from-to)	5302-5304
Number of pages	3
Journal	Applied Physics Letters
Volume	85
Issue number	22
DOIs	https://doi.org/10.1063/1.1829382
Publication status	Published - 2004 Nov 29

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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AB - Magnetic nanostructures at demagnetized and remanent states in Nd 4.5Fe77B18.5 nanocomposite magnets are investigated by electron holography, utilizing the specially designed electromagnet. The quantitative mapping of magnetization distribution at a nanometer scale using a polar diagram has been reported for both the demagnetized and remanent states. Through the polar diagrams for the remanent state, the homogeneous distribution of magnetic flux is found in the specimen annealed at a low temperature, while the fluctuated distribution is found in the specimen annealed at a high temperature. The difference is considered to be responsible for their magnetic properties, i.e., remanence and coercivity.

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Magnetization distribution in Nd_4.5Fe₇₇B _18.5 nanocomposite magnets studied by electron holography

Abstract

ASJC Scopus subject areas

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