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In situ magnetic force microscope studies of magnetization reversal of interaction domains in hot deformed Nd-Fe-B magnets

Thielsch, J. and Stopfel, H. and Wolff, U. and Neu, V. and Woodcock, T. G. and Güth, K. and Schultz, L. and Gutfleisch, O. (2012):
In situ magnetic force microscope studies of magnetization reversal of interaction domains in hot deformed Nd-Fe-B magnets.
In: Journal of Applied Physics, American Institute of Physics, p. 103901, 111, (10), ISSN 00218979,
[Online-Edition: http://dx.doi.org/10.1063/1.4712635],
[Article]

Abstract

A hot-deformed Nd-Fe-B sample has been chosen for the investigation of interaction domains by means of magnetic force microscopy. During the imaging process, a magnetic field of up to 6 T was applied in situ along the easy axis of magnetization. The thermally demagnetized state presents a regular pattern of interaction domains with an average width of about 1 μm but with a much larger length scale. Starting from the thermally demagnetized state, magnetization along the initial magnetization curve occurs via sequential switching of neighboring grain columns at the peripheries of the interaction domains. Demagnetization of a saturated sample takes place through the nucleation and expansion of a patchy domain pattern with a much larger extension and a substructure in the lateral range of the underlying grain size. Reversal processes under an applied magnetic field also take place at the borders of the domains.

Item Type: Article
Erschienen: 2012
Creators: Thielsch, J. and Stopfel, H. and Wolff, U. and Neu, V. and Woodcock, T. G. and Güth, K. and Schultz, L. and Gutfleisch, O.
Title: In situ magnetic force microscope studies of magnetization reversal of interaction domains in hot deformed Nd-Fe-B magnets
Language: English
Abstract:

A hot-deformed Nd-Fe-B sample has been chosen for the investigation of interaction domains by means of magnetic force microscopy. During the imaging process, a magnetic field of up to 6 T was applied in situ along the easy axis of magnetization. The thermally demagnetized state presents a regular pattern of interaction domains with an average width of about 1 μm but with a much larger length scale. Starting from the thermally demagnetized state, magnetization along the initial magnetization curve occurs via sequential switching of neighboring grain columns at the peripheries of the interaction domains. Demagnetization of a saturated sample takes place through the nucleation and expansion of a patchy domain pattern with a much larger extension and a substructure in the lateral range of the underlying grain size. Reversal processes under an applied magnetic field also take place at the borders of the domains.

Journal or Publication Title: Journal of Applied Physics
Volume: 111
Number: 10
Publisher: American Institute of Physics
Uncontrolled Keywords: boron alloys, cobalt alloys, demagnetisation, gallium alloys, grain size, hot pressing, iron alloys, magnetic domains, magnetic force microscopy, magnetic switching, magnetisation reversal, nanofabrication, nanomagnetics, nanostructured materials, neodymium alloys, nucleation, thermal expansion
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 22 Apr 2013 08:21
Official URL: http://dx.doi.org/10.1063/1.4712635
Identification Number: doi:10.1063/1.4712635
Funders: The authors are grateful to the Hans L. Merkle-Stiftung (Stifterverband für die deutsche Wissenschaft) for financial support.
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