Magnetoelastic effects in tangentially magnetized YIG films
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Abstract The principle of the method for excitation of magnetoelastic waves by a nonuniform magnetic field is described. In addition, the distribution of the nonuniform magnetic field appearing in the thin film by the demagnetization effect is obtained. Next, by using a yttrium iron garnet (YIG) thin film with a thickness of 100 μm and 5 × 15 mm 2 , an experiment of the magnetoelastic wave was carrid out at 3.5 GHz. the experimental results including the delay characteristics of the magnetoelastic wave have been compared with theoretical results. Also, the loss characteristics are studied experimentally from the viewpoint of dependence on the crystal axis. the minimum value of the loss of the magnetoelastic wave is 50 dB and the loss per delay of 1 μs is 30 dB when the crystal axes are oriented in 〈112〈.
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A novel approach to the suppression of magnetostatic modes in layered Ca-doped/pure yttrium iron garnet (YIG) films is presented. By properly selecting the position and width of the broad background signal excited in the Ca:YIG layer, the magnetostatic spectrum of the coupled pure YIG can be drastically modified. In particular, selecting a proper calcium concentration of the damping layer, an entire surface or volume mode band can be suppressed. In this paper, experimental results for double-layered films are reported. An extension to triple-layered films, allowing the total suppression of all modes but one, is also proposed.
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