An oscillator and method for applying a time-varying force to a magnet is provided. The oscillator includes a superconductor material at a temperature. The superconductor material is in a superconducting state in the presence of an external magnetic field below a critical field strength, wherein the critical field strength is a function of the temperature of the superconductor material. The oscillator further includes at least one magnetic field source configured to apply a magnetic field having a time-varying field strength to the superconductor material. The time-varying field strength cycles between at least a first field strength below the critical field strength for the superconductor material at the temperature and at least a second field strength above the critical field strength for the superconductor material at the temperature, such that the superconductor material cycles between a superconducting state and a non-superconducting state.