Nitrogen-bearing amorphous Fe83−xVxB14Si3 alloys: Thermal and magnetic properties

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Abstract
Magnetic properties of amorphous alloys Fe83−xVxB14Si3 containing 0.02–0.85 at. % nitrogen have been studied from 4 K to the crystallization temperatures. The effect of vanadium in these alloys is to decrease the ferromagnetic transition temperature TC at 23 K/at. % V, as well as the magnetization σ at 8.8 (emu/gm)/at. % V. This indicates loss of ferromagnetism in this alloy system for V concentrations greater than 26 at. %. The addition of nitrogen increases crystallization temperature Tx, saturation magnetization, and spin wave exchange stiffness constant D. The observed T‐dependence of the magnetization over the entire temperature range 4–300 K, can be described only by taking into account both the T3/2 and T5/2 terms. This is unlike the normal extended T3/2 behaviour observed in amorphous alloys having TC above room temperature.