Controlled mechnical modification of manganite surface with nanoscale resolution.

Kelly, Simon J; Kim, Yunseok; Eliseev, Eugene; Morozovska, Anna; Jesse, Stephen; Biegalski, Michael D; Mitchell, J F; Zheng, H; Aarts, J; Hwang, Inrok; Oh, Sungtaek; Choi, Jin Sik; Choi, Taekjib; Park, Bae Ho; Kalinin, Sergei V; Maksymovych, Peter

Kelly, Simon J; Kim, Yunseok; Eliseev, Eugene; Morozovska, Anna; Jesse, Stephen; Biegalski, Michael D; Mitchell, J F; Zheng, H; Aarts, J; Hwang, Inrok; Oh, Sungtaek; Choi, Jin Sik; Choi, Taekjib; Park, Bae Ho; Kalinin, Sergei V; Maksymovych, Peter.

Afiliación

Kelly SJ; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands.

Nanotechnology ; 25(47): 475302, 2014 Nov 28.

Article en En | MEDLINE | ID: mdl-25380080

RESUMEN

We investigated the surfaces of magnetoresistive manganites, La(1-x)Ca(x)MnO3 and La(2-2x)Sr(1+2x)Mn2O7, using a combination of ultrahigh vacuum conductive, electrostatic and magnetic force microscopy methods. Scanning as-grown film with a metal tip, even with zero applied bias, was found to modify the surface electronic properties such that in subsequent scans, the conductivity is reduced below the noise level of conductive probe microscopy. Scanned areas also reveal a reduced contact potential difference relative to the pristine surface by â¼0.3 eV. We propose that contact-pressure of the tip modifies the electrochemical potential of oxygen vacancies via the Vegard effect, causing vacancy motion and concomitant changes of the electronic properties.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nanotechnology Año: 2014 Tipo del documento: Article País de afiliación: Países Bajos Pais de publicación: Reino Unido

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