Subharmonic generation in ferromagnetic metals

The transmission resonance experiment which has led to the first detection of microwave subharmonic generation in ferromagnetic metals is presented. The subharmonic generation was observed in iron at room temperature. In the experiment, the sample forms the common wall of two microwave cavities. The input cavity is tuned at 18.74 GHz. The output cavity is tuned at 9.37 GHz. THe static applied magnetic field and the incident microwave field are mutually parallel and parallel to the sample surface. Results of numerical calculations performed with the aid of a computer using this nonlinear theory are presented here for iron and nickel.