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Unexpected magnetic behavior in amorphous Co90Sc10 alloy

Ghafari, M. and Sakurai, Y. and Peng, G. and Fang, Y. N. and Feng, T. and Hahn, H. and Gleiter, H. and Itou, M. and Kamali, S. (2015):
Unexpected magnetic behavior in amorphous Co90Sc10 alloy.
In: Applied Physics Letters, AIP Publishing, p. 132406, 107, (13), ISSN 0003-6951,
[Online-Edition: http://dx.doi.org/10.1063/1.4932113],
[Article]

Abstract

An amorphous alloy Co90Sc10 has been prepared by rapid quenching from the melt. The results of magnetization measurements show that this alloy has the highest Curie temperature reported for any amorphous transition metal based alloys. Furthermore, for a Co based amorphous alloy, the magnetic moment is remarkably high. Moreover, the alloy exhibits soft magnetic properties. Based on the findings, amorphous Co90Sc10 appears to be an attractive candidate for applications as a soft magnetic material. The temperature dependence of the reduced magnetization can be described by the Bloch power law. The results show that the B coefficient of the amorphous Co90Sc10 alloy, which is a measure of the rigidity of spin waves, exhibits the lowest value observed until now for any amorphous alloy and is comparable to crystalline alloys. It is found that the Sc atoms in the Co90Sc10 alloy lead to an increase of the itinerant spin moment of Co atoms, and, in contrast to this behaviour, to a decrease of the local 3d-electrons of Co.

Item Type: Article
Erschienen: 2015
Creators: Ghafari, M. and Sakurai, Y. and Peng, G. and Fang, Y. N. and Feng, T. and Hahn, H. and Gleiter, H. and Itou, M. and Kamali, S.
Title: Unexpected magnetic behavior in amorphous Co90Sc10 alloy
Language: English
Abstract:

An amorphous alloy Co90Sc10 has been prepared by rapid quenching from the melt. The results of magnetization measurements show that this alloy has the highest Curie temperature reported for any amorphous transition metal based alloys. Furthermore, for a Co based amorphous alloy, the magnetic moment is remarkably high. Moreover, the alloy exhibits soft magnetic properties. Based on the findings, amorphous Co90Sc10 appears to be an attractive candidate for applications as a soft magnetic material. The temperature dependence of the reduced magnetization can be described by the Bloch power law. The results show that the B coefficient of the amorphous Co90Sc10 alloy, which is a measure of the rigidity of spin waves, exhibits the lowest value observed until now for any amorphous alloy and is comparable to crystalline alloys. It is found that the Sc atoms in the Co90Sc10 alloy lead to an increase of the itinerant spin moment of Co atoms, and, in contrast to this behaviour, to a decrease of the local 3d-electrons of Co.

Journal or Publication Title: Applied Physics Letters
Volume: 107
Number: 13
Publisher: AIP Publishing
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: 02 Dec 2015 13:57
Official URL: http://dx.doi.org/10.1063/1.4932113
Identification Number: doi:10.1063/1.4932113
Funders: The Magnetic Compton Experiments and High Energy X-Ray Diffraction (HE-XRD) Experiments have been carried out at Spring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposal Nos.: 2015A1889 and 2015A1890).
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