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Browse Journals & Magazines > Journal of Applied Physics ...> Volume:92 Issue:12 Help

Temperature dependence of the activation volume in high-temperature Sm(Co,Fe,Cu,Zr)z magnets

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3 Author(s)
Panagiotopoulos, I. ; Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece ; Gjoka, M. ; Niarchos, D.

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Magnetization relaxation and remanence measurements in the temperature range from 100 to 600 °C were performed in a Sm(Co0.75F0.12Cu0.10Zr0.03)7.6 alloy in order to estimate the activation volume V*. The coefficient of magnetic viscosity S is found to decrease with temperature up to 500 °C showing an increase in the width of the energy barrier distribution function. A drastic increase of the value of V* above the Curie point of the intergranular phase is attributed to a crossover from a pinning to a nucleation type of magnetic reversal. © 2002 American Institute of Physics.

Published in:
Journal of Applied Physics  (Volume:92 ,  Issue: 12 )

Date of Publication: Dec 2002

Page(s):
7693 - 7695
ISSN :
0021-8979
Digital Object Identifier :
10.1063/1.1522836
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Dec 2002

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