Patent ID: 8372217

Claim:
A magnetic core utilizing an amorphous iron-based alloy according to a chemical composition with a formula Fe a B b Si c C d where 81.5<a≦84, 12<b<17, 1≦c<5 and 0.3≦d≦1.0, numbers being in atomic percent with a+b+c+d=100, with incidental impurities, simultaneously having a value of saturation magnetic induction equal to or greater than 1.63 tesla, a Curie temperature between 315° C. and 360° C., a crystallization temperature between 400° C. and 470° C., and a saturation magnetostriction that is greater than or equal to 26 ppm and is less than or equal to 28 ppm, wherein the alloy has been annealed in a magnetic field applied in a direction along a circumference of the core, and the core does not contain discrete crystalline particles.