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Surface Acoustic Wave Propagation in Lanthanum Strontium Manganese Oxide - Lithium Niobate Structures

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Surface acoustic wave (SAW) propagation characteristics in the La0 . 67 Sr0 . 33MnO3(LSMO) - lithium niobate (LiNbO3) heterostructures have been experimentally studied at temperatures ranging from 87 K to 432 K. The LSMO films with thickness of about 100 nm were grown in situ by DC magnetron sputtering on Y-plane of crystalline LiNbO3. The sample properties depended on the growth temperature. Electrical resistance of polycrystalline LSMO film grown at 450 °C decreased monotonically with increasing temperature, and the SAW attenuation and velocity of the heterostructure have been well described by the acoustoelectric interaction theory. Heterostructures with highly oriented LSMO films prepared at 620 °C and 710 °C exhibited peak-like anomalies of SAW attenuation. Presence of frequency-dependent SAW attenuation peaks in the vicinity of the paramagnetic to ferromagnetic transition of the manganite films has been attributed to the electronic phase separation phenomena in the manganites. The demonstrated results revealed not only a conventional SAW behaviour under thin film influence, but also an existence of additional LSMO fabrication process-dependent factors not described by the acoustoelectric interaction theory and a suitability of the used technique for the contactless LSMO probing and sensor applications.
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Document Type: Short Communication

Publication date: May 1, 2013

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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