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Magnetic microstructure of nanostructured Fe, studied by small angle neutron scattering

Published online by Cambridge University Press:  31 January 2011

W. Wagner ,
A. Wiedenmann ,
W. Petry ,
A. Geibel  and
H. Gleiter
W. Wagner
Affiliation:
Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
A. Wiedenmann
Affiliation:
Hahn-Meitner-Institut, Glienicker Strasse 100, D-1000 Berlin 39, Germany
W. Petry
Affiliation:
Institute Laue-Langevin, 156X, F-38042 Grenoble, France
A. Geibel
Affiliation:
Institut für neue Materialien, Gebäude 43, Universität des Saarlandes, D-6600 Saarbrücken, Germany
H. Gleiter
Affiliation:
Institut für neue Materialien, Gebäude 43, Universität des Saarlandes, D-6600 Saarbrücken, Germany
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Abstract

Small angle neutron scattering (SANS) was applied to achieve insight into the magnetic correlations in nanostructured Fe. The results confirm the expected microstructure involving ferromagnetic grains and a nonmagnetic or weakly magnetic interface region, the interfaces occupying about half the specimen volume. The SANS measurements further reveal that in nanostructured Fe the magnetic correlations are not confined to single grains, but are extended across the interfaces and result in the alignment of the magnetization over several hundreds of grains. An external field of 1.5 kOe is not sufficient for complete magnetic alignment of the entire specimen. However, the long-range magnetic correlations are considerably disturbed by this field. Reducing the external magnetic field to zero causes the magnetic correlations to resume microstructural characteristics similar to what they had in the original state.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2305 - 2311
Copyright
Copyright © Materials Research Society 1991

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