Abstract
The dependence of the initial magnetic permeability and its stability during aging on the quanching ability of a quenchant (brine, water, oil and air) applied after annealing (708 K/10 min) of non-magnetostrictive Co 71.5Fe 2.5Mn 2Mo 1Si 9B 14 glass characterized by a medium value of T c was studied. It was found that the heat treatment enhances magnetic permeability μ 0.4 of the studied glass by a factor of 4–13 depending on the quenching medium. The highest value of μ 0.4 (>25 000) was obtained for the glass quenched with an intermediate quenching rate achieved in oil. An approximately linear decrease in μ 0.4 with the logarithm of aging time t of the studied glass was observed in as-quenched state as well as after heat treatment. The highest stability of μ was found for the glass annealed and slowly and slowly cooled in open air. The obtained results are explained on the basis of changes of local magnetic anisotropy during annealing and aging.
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