Microwave absorption of integrated CoNbZr film on a coplanar waveguide

The microwave power absorption and characteristic impedance of integrated CoNbZr magnetic films on coplanar waveguides have been investigated. The power absorption peaks of the CoNbZr films (50 μm×2 mm) with different film thickness, 0.5, 1, and 2 μm, were observed at around 3.3, 4.5, and 5.8 GHz, respectively. These peak frequencies were in good agreement with calculated ferromagnetic resonance frequencies including magnetic shape anisotropy effects. Compared with the coplanar waveguide without a magnetic film, the characteristic impedance of these integrated films at 1 GHz (in passband frequency) was shown to be increased. This change resulted in the large increment of inductance up to 33% without any significant changes of the capacitance.