Large Nonreciprocal Propagation of Surface Acoustic Waves in Epitaxial Ferromagnetic/Semiconductor Hybrid Structures
| Autor: | Joan Manel Hernàndez, Alberto Hernández-Mínguez, Jens Herfort, Paulo V. Santos, Ferran Macià |
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| Rok vydání: | 2020 |
| Předmět: |
FOS: Physical sciences
Physics::Optics General Physics and Astronomy Applied Physics (physics.app-ph) 02 engineering and technology 01 natural sciences Condensed Matter::Materials Science Spin wave Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Materials Science (cond-mat.mtrl-sci) Resonance Physics - Applied Physics Acoustic wave Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Magnetic field Orientation (vector space) Ferromagnetism 0210 nano-technology Realization (systems) Acoustic attenuation |
| Zdroj: | Physical Review Applied. 13 |
| ISSN: | 2331-7019 |
| Popis: | Nonreciprocal propagation of sound, that is, the different transmission of acoustic waves traveling in opposite directions, is a challenging requirement for the realization of devices such as acoustic isolators and circulators. Here, we demonstrate efficient nonreciprocal transmission of surface acoustic waves (SAWs) propagating in opposite directions in a $\mathrm{Ga}\mathrm{As}$ substrate coated with an epitaxial ${\mathrm{Fe}}_{3}\mathrm{Si}$ film. The nonreciprocity arises from the acoustic attenuation induced by the magnetoelastic (ME) interaction between the SAW strain field and spin waves in the ferromagnetic film, which depends on the SAW propagation direction and can be controlled via the amplitude and orientation of an external magnetic field. The acoustic-transmission nonreciprocity, defined as the difference between the transmitted acoustic powers for forward and backward propagation at the ME resonance, reaches values of up to 20%, which are, to our knowledge, the largest values of nonreciprocity reported for SAWs traveling in a semiconducting piezoelectric substrate covered by a ferromagnetic film. The experimental results are well accounted for by a model for the ME interaction, which also shows that the nonreciprocity can be further enhanced by optimization of the sample design. These results make ${\mathrm{Fe}}_{3}\mathrm{Si}/\mathrm{Ga}\mathrm{As}$ a promising platform for the realization of efficient nonreciprocal SAW devices. |
| Databáze: | OpenAIRE |
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