Analytical model for explosive-driven ultracompact shock-wave ferromagnetic generators

An analytical model was developed in order to predict the amplitude of the current pulse produced by an ultra-compact explosive-driven shock-wave ferromagnetic generator (FMG) that utilizes longitudinal (shock wave propagates along the magnetization vector M) or transverse (shock wave propagates across the magnetization vector M) shock wave demagnetization of Nd2Fe14B hard ferromagnets. The model is based on an idea that the principal physical parameter determining FMG pulse generation is the magnitude of the energy product, (B·H), of the ferromagnetic element of the FMG, rather than the magnitude of the remnant magnetization, Br, of the ferromagnetic material of the FMG energy carrying element. Therefore, soft ferromagnets, which have high Br, can not be considered as a material for shock wave FMGs due to their low (B·H)max. However, hard ferromagnets have high (B·H)max and provide high output in explosive pulsed power devices. We found good agreement between calculated and experimentally obtained pulsed power generation in a variety of FMGs.