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Possible ferroelectricity in perovskite oxynitride SrTaO(2)N epitaxial thin films

Compressively strained SrTaO(2)N thin films were epitaxially grown on SrTiO(3) substrates using nitrogen plasma-assisted pulsed laser deposition. Piezoresponse force microscopy measurements revealed small domains (10(1)–10(2) nm) that exhibited classical ferroelectricity, a behaviour not previously...

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Detalles Bibliográficos
Autores principales: Oka, Daichi, Hirose, Yasushi, Kamisaka, Hideyuki, Fukumura, Tomoteru, Sasa, Kimikazu, Ishii, Satoshi, Matsuzaki, Hiroyuki, Sato, Yukio, Ikuhara, Yuichi, Hasegawa, Tetsuya
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4023398/
http://dx.doi.org/10.1038/srep04987
Descripción
Sumario:Compressively strained SrTaO(2)N thin films were epitaxially grown on SrTiO(3) substrates using nitrogen plasma-assisted pulsed laser deposition. Piezoresponse force microscopy measurements revealed small domains (10(1)–10(2) nm) that exhibited classical ferroelectricity, a behaviour not previously observed in perovskite oxynitrides. The surrounding matrix region exhibited relaxor ferroelectric-like behaviour, with remanent polarisation invoked by domain poling. First-principles calculations suggested that the small domains and the surrounding matrix had trans-type and a cis-type anion arrangements, respectively. These experiments demonstrate the promise of tailoring the functionality of perovskite oxynitrides by modifying the anion arrangements by using epitaxial strain.