An apparatus for generating a pulsed magnetic field includes an insulating body, an electrical conductor positioned on the insulating body, and a ferromagnetic body having a hollow portion, wherein the insulating body and the electrical conductor are positioned in the hollow portion. In some embodiments of the present disclosure, the electrical conductor has at least one gap separating the electrical conductor into at least two parts, thereby allowing a current to flow through the at least two parts in parallel to generate a magnetic field in the insulating body.