Spin-wave filters based on thin Y3Fe5O12 films on Gd3Ga5O12 and Si substrates for microwave applications

Spin-wave bandpass filters with small sizes on the basis of thin Y 3 Fe 5 O 12 [yttrium-iron garnet (YIG)] films on Gd 3 Ga 5 O 12 [gadolinium-gallium garnet (GGG)] and SiO 2 / Si substrates have been constructed. A thin YIG film with a thickness of 0.8 μ m 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.