Surface acoustic wave coupled to magnetic resonance on a multiferroic CuB2O4
Abstract
We observed surface acoustic wave (SAW) propagation on a multiferroic material CuB2O4 with use of two interdigital transducers (IDTs). The period of IDT fingers is as short as 1.6 μm so that the frequency of SAW is 3 GHz, which is comparable with that of magnetic resonance. In antiferromagnetic phase, the SAW excitation intensity varied with the magnitude and direction of the magnetic field, owing to the dynamical coupling between SAWs and antiferromagnetic resonance of CuB2O4. The microscopic mechanism is discussed based on the symmetrically allowed magentoelastic coupling.
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