Abstract
Coercive force Hc and core loss at high frequency f up to 100 kHz were investigated for amorphous Fe-based alloys with various magnetostrictions. Log Hc is shown to be proportional to log f. Magnetic core loss at high frequency for annealed toroidal cores of amorphous Fe-based alloys was shown to be significantly dependent on magnetostriction. Core loss and rectangular ratio in a dc B-H loop are influenced by the number of amorphous tape winding turns N, which is interpreted in terms of surface oxidation of the toroidal core. Very low core losses of 195 mW/cm3 and 350 mW/cm3 (3 kG, 50 kHz) were attained for a ring and a toroidal core, respectively, of the amorphous (Fe0.82Ni0.10Nb0.08)83Si5B12 alloy with a low magnetostriction of 5×10−6.
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