Microstrip resonator for nonlinearity investigation of thin magnetic films and magnetic frequency doubler

Belyaev, B. A.; Afonin, A. O.; Ugrymov, A. V.; Govorun, I. V.; Solovev, P. N.; et al. Review Of Scientific Instruments. https://doi.org/10.1063/1.4941390

A structure that consists of a λ/4 stepped-impedance microstrip resonator is proposed as an instrument for the investigation of nonlinear effects in thin magnetic films and also can be used as a microwave frequency doubler. A conversion efficiency of 0.65% is observed at a one-layer 100 nm Ni₈₀Fe₂₀ thin film at an input signal level of 4.6 W for a 1 GHz probe signal. The maximum measured conversion efficiency (1% at 1 GHz) was achieved for the 9-layer Ni₈₀Fe₂₀ film where 150 nm magnetic layers were separated by SiO₂ layers