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Grain-size-dependent magnetic properties of nanocrystalline Gd

Kruk, R. and Ghafari, M. and Hahn, H. and Michels, D. and Birringer, R. and Krill, C. and Kmiec, R. and Marszalek, M. (2006):
Grain-size-dependent magnetic properties of nanocrystalline Gd.
In: Physical Review B, American Physical Society, pp. 054420-1-054420-6, 73, (5), ISSN 1098-0121,
[Online-Edition: http://dx.doi.org/10.1103/PhysRevB.73.054420],
[Article]

Abstract

Microscopic magnetic and electronic properties of nanocrystalline Gd were studied by 155Gd Mössbauer spectroscopy. This technique made it possible to distinguish the microstructure-dependent properties of Gd located in nanocrystal interiors from the properties of Gd in the grain boundaries. For the grain interiors a correlation between the induced magnetic anisotropy and the grain size was observed; this anisotropy can be attributed to the internal pressure resulting from the interface stress of the grain boundaries. The magnetic and electronic structure of the atoms in the grain boundaries differs distinctively from that in the grain interiors: the Gd magnetic moments at the grain boundaries are randomly oriented with respect to the local crystallographic axes, and the density of conduction s electrons is reduced, perhaps as a result of a lower number of Gd nearest neighbors.

Item Type: Article
Erschienen: 2006
Creators: Kruk, R. and Ghafari, M. and Hahn, H. and Michels, D. and Birringer, R. and Krill, C. and Kmiec, R. and Marszalek, M.
Title: Grain-size-dependent magnetic properties of nanocrystalline Gd
Language: English
Abstract:

Microscopic magnetic and electronic properties of nanocrystalline Gd were studied by 155Gd Mössbauer spectroscopy. This technique made it possible to distinguish the microstructure-dependent properties of Gd located in nanocrystal interiors from the properties of Gd in the grain boundaries. For the grain interiors a correlation between the induced magnetic anisotropy and the grain size was observed; this anisotropy can be attributed to the internal pressure resulting from the interface stress of the grain boundaries. The magnetic and electronic structure of the atoms in the grain boundaries differs distinctively from that in the grain interiors: the Gd magnetic moments at the grain boundaries are randomly oriented with respect to the local crystallographic axes, and the density of conduction s electrons is reduced, perhaps as a result of a lower number of Gd nearest neighbors.

Journal or Publication Title: Physical Review B
Volume: 73
Number: 5
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 11 Feb 2013 09:06
Official URL: http://dx.doi.org/10.1103/PhysRevB.73.054420
Identification Number: doi:10.1103/PhysRevB.73.054420
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