Rev.Adv.Mater.Sci. (RAMS)
No 6, Vol. 18, 2008, pages 545-548

MAGNETIC PROPERTIES OF Co DOPED FINEMET AT ELEVATED TEMPERATURE

Aleksandra Kolano-Burian, Roman Kolano, Tadeusz Kulik and Jarołsaw Ferenca

Abstract

The aim of this research was to investigate the effect of elevated temperatures on soft magnetic properties of the Co-modified Finemet type alloys designed for high-temperature and high-frequency applications in power electronics. The Finemet type alloys modified by Co were subjected to thermo-magnetic treatment in an external magnetic field of 160 kA/m, followed by ageing for up to 150 hours at the temperatures of 200 and 300 úC, and their AC magnetic properties have been measured. For selected alloys dependence of soft magnetic properties on temperature up to 350 úC have also been measured. The obtained results confirmed that partial substitution of Fe with Co in Finemet type alloys improves their high-temperature behaviour thus making them suitable for functional application in power electronic equipment.

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