Patent ID: 6052042
Filing Date: 2000-04-18
Classification: H01F,H03H

Abstract:
A magnetostatic wave device comprising:a single crystal Gd.sub.3 Ga.sub.5 O.sub.12 substrate;a magnetic garnet single crystal film on the single crystal substrate, the magnetic garnet single crystal film having {111} plane and being of a material expressed by the formula (A.sub.1 R.sub.1).sub.3 (FeR.sub.2).sub.5 O.sub.12, where A.sub.1 is at least one member selected from the group consisting of Y, Bi, Lu, Gd, Al, In and Se, R.sub.1 is different from A.sub.1 and is at least one element selected from the group consisting of La, Bi, Lu and Gd, R.sub.2 is at least one element selected from the group consisting of Ga, Al, In and Sc and wherein the molar content of A.sub.1 in A.sub.1 R.sub.1 is greater than R.sub.1 and the molar content of Fe in FeR.sub.2 is greater than R.sub.2 ;at least one transducer provided on the magnetic garnet single crystal film; anda DC magnetic field source adapted to apply a magnetic field to the magnetic garnet single crystal film such that a magnetostatic surface wave launched by the transducer propagates on the magnetic garnet single crystal film in the <1 10> axis direction on {111} plane of the magnetic garnet single crystal film, wherein the operation frequency is at least about 1 GHz or less.