Spin-wave filters based on thin Y_3Fe_5O_(12) films on Gd_3Ga_5O_(12) and Si substrates for microwave applications

摘要

Spin-wave bandpass filters with small sizes on the basis of thin Y_3Fe_5O_(12) [yttrium-iron garnet (YIG)] films on Gd_3Ga_5O_(12) [gadolinium-gallium garnet (GGG)] and SiO_2/Si substrates have been constructed. A thin YIG film with a thickness of 0.8μm on SiO_2/Si substrates has been grown by the ion-beam sputtering. It is found that the coplanar antenna structure can be successfully used to construct tunable small-sized narrowband bandpass filters based on spin waves. The filter transmission characteristic has a nonreciprocity when the direction of energy propagation changes. Spin-wave filter characteristics are analyzed using the transmission-matrix formalism.