Article ID Journal Published Year Pages File Type
1816053 Physica B: Condensed Matter 2007 5 Pages PDF
Abstract

 Soft magnetic properties of Co-based amorphous alloy of the composition Co67Fe4Ni2Si15B12 have been investigated by isothermal heat treatment up to the conventional crystallization temperature. In the as-cast condition the Curie temperature of the sample is 272 °C and saturation magnetization is 74 emu/g. Magnetic properties undergo variation depending on the heat treatment temperature. For the heat treatment temperatures of around 420 and 490 °C, superior soft magnetic properties are obtained. For both the temperatures initial permeability, μ′ reaches value up to ten times the value of permeability in the as-received samples. Annealing effect on giant magneto-impedance has been observed for the current-driving frequencies of 4.5 and 6 MHz. Field dependence of magneto-impedance shows hysteresis at low field, which is related to the changes in the magnetization process of the sample.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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