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Abstract
A new nanocrystalline Fe-based soft magnetic alloy is discussed here. Ingots of nanocrystalline alloys (FeCu)80ZrxSi20−x (x=5, 6, and 8) were prepared by arc melting. The ingots were remelted and cast into 25–30μm thick ribbons by a single roller melt spinning method. X-ray diffraction (XRD) revealed the as-spun ribbons to be amorphous. The structural evolution of these samples was studied by XRD and transmission electron microscopy (TEM) after annealing at 450, 480, and 550°C. XRD shows the primary nanocrystallization product to be the α-Fe(Si) phase. The grain size was observed by TEM to be ∼10nm after annealing at 480°C for 1h and 14nm after 550°C for 1h. ac soft magnetic properties were measured using a Walker AMH 401 ac permeameter. The core loss at an exciting frequency f=100kHz and maximum induction Bm=1kG was determined to be less than 19W∕kg.
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