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Controlling spin polarized band-structure by variation of vacancy intensity in nanostructures

Kamali, S. and Kilmametov, A. and Ghafari, M. and Itou, M. and Hahn, H. and Sakurai, Y. (2015):
Controlling spin polarized band-structure by variation of vacancy intensity in nanostructures.
In: Journal of Physics: Condensed Matter, IOP Publishing Ltd., pp. 075304, 27, (7), ISSN 0953-8984,
[Online-Edition: http://dx.doi.org/10.1088/0953-8984/27/7/075304],
[Article]

Abstract

In this study, the magnetic properties of FeAl alloys with different grain sizes produced by high-pressure torsion were probed by means of magnetic Compton scattering. The measurements were performed at 300 and 10 K. Magnetic Compton profiles of nanocrystalline (35 nm) and ultrafine-grained (160 nm) FeAl alloys were analyzed in terms of the integral area, the width, and the distinctive dip intensity at low momenta. The changes in total magnetic moment and the strength of spin-polarization of itinerant electrons are assumed to be caused by vacancies induced during the preparation of the samples. Despite local disordering due to interfacial regions and deviations in perfect stoichiometry for B2 structure, the effect of vacancies is considered as the major magnetic state contributor.

Item Type: Article
Erschienen: 2015
Creators: Kamali, S. and Kilmametov, A. and Ghafari, M. and Itou, M. and Hahn, H. and Sakurai, Y.
Title: Controlling spin polarized band-structure by variation of vacancy intensity in nanostructures
Language: English
Abstract:

In this study, the magnetic properties of FeAl alloys with different grain sizes produced by high-pressure torsion were probed by means of magnetic Compton scattering. The measurements were performed at 300 and 10 K. Magnetic Compton profiles of nanocrystalline (35 nm) and ultrafine-grained (160 nm) FeAl alloys were analyzed in terms of the integral area, the width, and the distinctive dip intensity at low momenta. The changes in total magnetic moment and the strength of spin-polarization of itinerant electrons are assumed to be caused by vacancies induced during the preparation of the samples. Despite local disordering due to interfacial regions and deviations in perfect stoichiometry for B2 structure, the effect of vacancies is considered as the major magnetic state contributor.

Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 27
Number: 7
Publisher: IOP Publishing Ltd.
Uncontrolled Keywords: FeAl alloys, high-pressure torsion, magnetic compton scattering, magnetism, nano-structures
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 > Joint Research Laboratory Nanomaterials
Date Deposited: 10 Feb 2016 09:24
Official URL: http://dx.doi.org/10.1088/0953-8984/27/7/075304
Identification Number: doi:10.1088/0953-8984/27/7/075304
Funders: S Kamali acknowledges the Japan Society for the Promotion of Science for financial support., The magnetic Compton scattering experiment was performed with the approval of the Japan Synchrotron Radiation Research Institute (Proposal No.: 2014A1489).
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