Low magnetostrictive amorphous Fe-Nb-Si-B alloys

Abstract
Magnetostriction and magnetic core loss at high frequency up to 50 kHz were investigated together with saturation magnetization, Curie temperature, and crystallization temperature for amorphous (Fe1−xNbx)83Si5B12 alloys. Magnetostriction decreases with Nb content, and becomes 1×10−6 for x=0.115. Magnetostriction was shown not to be proportional to the square of saturation magnetization unlike many Fe-based amorphous alloys. Iron loss at high frequency was measured on the core before and after resin molding. Iron loss increase due to resin molding was reduced as magnetostriction decreases. The incremental rate of the loss due to resin molding was increased as frequency decreases.

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