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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.33: Poster
Tuesday, April 2, 2019, 17:00–20:00, Poster E
Surface dead layer in thin manganite films studied by Surface-Enhanced Raman Spectroscopy — Sebastian Merten, •Jonas Wawra, and Vasily Moshnyaga — I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Half-metallic mixed-valence manganites are promising materials for spintronic applications. However, extrinsic effects, like surface dead layer or chemical segregation, prevent that they unfold their true potential. Here, we present a Surface-Enhanced Raman (SER) spectroscopy study of the surface dead layer in doped La0.7(Ca or Sr)0.3MnO3 thin films, grown by MAD technique. The required Au nanoparticles have been grown with the same technique. The SER spectra of the free manganite surface reveal an electron-enrichment, manifested by the appearance of strong Jahn-Teller stretching modes. To manipulate this electron-rich surface layer, we have modified the manganite surface by deposition of 1-2 monolayers of SrO, MgO and TiO2, and compared the obtained SER spectra with those from the free surface. Financial support of the Deutsche Forschungsgesellschaft via SFB TP A02 is acknowledged.