Lead inductance of ferromagnetic materials and a method to reduce inductance at low frequencies

Abstract

Data on the inductance of Alloy 42 and Kovar and its relationship to frequency are presented. The domain theory is applied to explain the relaxation phenomena of ferromagnetic materials vs. ferrites. The measured inductance of ferromagnetic materials and copper strips is compared with theoretical calculations. Also, a method of reducing the inductance of ferromagnetic materials at low frequencies is discussed. A transition state between 1 and 10 MHz in Alloy 42 and Kovar is found. Non-ferromagnetic materials (copper, solder, gold, silver, etc.) can be plated over the entire ferromagnetic material to reduce the inductance at low and high frequency. It is shown that there is no way to find the quantitative value of magnetic permeability of ferromagnetic material by measuring the inductance and employing the analytical formula at low-current (mA) and low-voltage (mV) conditions.<>