High-frequency properties of micro-wire cores

High-frequency properties of toroid cores made of amorphous glass-coated micro-wire are reported in this work. The frequency dependencies of permeability and loss factor in the 0.1–30 MHz range are presented. We studied also the dependence of specific losses on flux density. The real part of effective permeability lies in the range of 150–1000, and the value is nearly constant in a broad frequency range (up to 30 MHz). The imaginary part demonstrates a monotonous increase up to 30 MHz for all samples. Specific losses of micro-wire cores are small in comparison to those of ferrite cores.