Influence of the interface on the magnetic anisotropy of CoCu granular alloys

We present zero-field cooling (ZFC) DC magnetization measurements on Co x Cu 100 - x ( x = 5 , 10 ) granular ribbons. The analysis of these curves has allowed us to deepen on the study of the Co superparamagnetic phase. On one hand, the fitting of the ZFC magnetization curves has given values of the...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2004-12, Vol.354 (1), p.92-97
Main Authors: Prieto, A Garcia, Fdez-Gubieda, M L
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Exact sciences and technology
Giant magnetoresistance
Granular alloys
Magnetic anisotropy
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Physics
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Summary:We present zero-field cooling (ZFC) DC magnetization measurements on Co x Cu 100 - x ( x = 5 , 10 ) granular ribbons. The analysis of these curves has allowed us to deepen on the study of the Co superparamagnetic phase. On one hand, the fitting of the ZFC magnetization curves has given values of the size and size-distribution of the Co nanoclusters in good agreement with previous results obtained from the analysis of the room temperature hysteresis loops on the same samples. On the other hand, we have obtained information about the effective volume magnetic crystalline anisotropy. The values found for this parameter are about one order of magnitude larger than that of FCC Co and size dependent, increasing as the cluster size decreases. We have related this enhancement of the magnetic anisotropy to the large contribution coming from the atoms at the surface of the Co nanoclusters.
ISSN:0921-4526
DOI:10.1016/j.physb.2004.09.025