Temperature dependence of the activation volume in high-temperature Sm(Co,Fe,Cu,Zr)(z) magnets
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Panagiotopoulos, I.
Gjoka, M.
Niarchos, D.
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American Institute of Physics
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peer reviewed
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Journal of Applied Physics
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Magnetization relaxation and remanence measurements in the temperature range from 100 to 600 degreesC 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 degreesC 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. (C) 2002 American Institute of Physics.
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sm-co magnets, permanent-magnets, coercivity analysis, magnetization, mechanism
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<Go to ISI>://000179495100122
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών