Tuned oscillator utilizing thin film ferromagnetic resonator

A tuned oscillator utilizing a thin film ferromagnetic resonator comprising;

• an active element for oscillation,
• a tin film ferromagnetic resonance element formed of a thin film ferromagnetic plate and a transmission line coupled to said thin film ferromagnetic plate and connected to said active element as a part of a feed back circuit for said active element,
• bias magnetic field means applying a bias magnetic field perpendicular to said thin film ferromagnetic plate, and
• a PLL (phase lock loop) circuit receiving an oscillation output and generating a control signal to stabilize the oscillation,
• said bias magnetic field means being formed of a permanent magnet which generates a fixed bias magnetic field component and a coil which generates a variable bias magnetic field component, said coil being fed with a current which is controlled by said control signal which is obtained from said PLL circuit.