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Bulk magnetic domain structures visualized by neutron dark-field imaging

Appl. Phys. Lett. 93, 112504 (2008); doi:10.1063/1.2975848

Published 16 September 2008

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C. Grünzweig,1 C. David,1 O. Bunk,1 M. Dierolf,1 G. Frei,1 G. Kühne,1 R. Schäfer,2 S. Pofahl,2 H. M. R. Rønnow,3 and F. Pfeiffer1,3
1Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2IFW Dresden, Institute for Metallic Materials, Helmholtzstrasse 20, D-01069 Dresden, Germany
3Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
We report on how a neutron grating interferometer can yield projection images of the internal domain structure in bulk ferromagnetic samples. The image contrast relies on the ultrasmall angle scattering of unpolarized neutrons at domain wall structures in the specimen. The results show the basic domains of (110)-oriented sheets in an FeSi test sample. The obtained domain structures could be correlated with surface sensitive magneto-optical Kerr effect micrographs. ©2008 American Institute of Physics
History: Received 9 July 2008; accepted 31 July 2008; published 16 September 2008
Permalink: http://link.aip.org/link/?APPLAB/93/112504/1
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KEYWORDS and PACS

Keywords
PACS
  • 03.75.Dg
    Atom and neutron interferometry
  • 75.50.Bb
    Ferromagnetism of Fe and its alloys
  • 75.60.Ch
    Magnetic domain walls and domain structure
  • 78.20.Ls
    Magnetooptical effects (bulk materials/thin films)
  • 42.65.Hw
    Phase conjugation; photorefractive and Kerr effects
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (22)
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  20. The (110)-oriented FeSi (Fe3  wt %Si) disk had a thickness of 300  µm and was cut from a Goss-oriented transformer steel with a diameter of 10 mm. We note that surface polishing was only necessary to acquire the Kerr images; neutron DFI contrast can equally well be obtained on unpolished samples.
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  22. The images were recorded using a 100  µm thick Li-6/ZnS converter and fluorescence screen with a 1:1 optical lens system and a cooled charge coupled device (Fingerlake Instrumentation) (1024×1024  pixels, pixel size of 24×24  µm2). The effective spatial resolution was mainly determined by the intrinsic blurring in the scintillation screen to 100  µm (Ref. 21). A typical exposure time for a single raw image was 30 s; typically four or eight images were taken to yield one DCI.

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