Abstract
The amorphous Fe40Ni40B20 alloy shows excellent soft magnetic properties when heat-treated at 630 K for 10–15 min. The improved magnetic softness is attributed to the relaxation of internal stress. The relaxation behaviour obeys the so-called ‘lnt’ kinetics. Small crystalline particles do appear after longer duration isothermal treatment at 630 K which is much lower than the crystallization temperature. Formation of crystalline particles induces magnetocrystalline anisotropy in the system which in turn detoriorates the magnetic softness.
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