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Fe nanoparticles on ZnSe: Reversible temperature dependence of the surface barrier potential (Articolo in rivista)

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Fe nanoparticles on ZnSe: Reversible temperature dependence of the surface barrier potential (Articolo in rivista) (literal)

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Alternative label

Cantoni, M 1,2; Bertacco, R 1,2; Brambilla, A 3,4; Finazzi, M 3,4; Duo, L 3,4; Ciccacci, F 3,4; Verdini, A 5; Floreano, L 5; Morgante, A 5,6; Passoni, M 7,8; Casari, CS 7,8,9; Bassi, AL 7,8,9 (2012)
Fe nanoparticles on ZnSe: Reversible temperature dependence of the surface barrier potential
in Physical review. B, Condensed matter and materials physics; The American Physical Society, Ridge, NY (Stati Uniti d'America)
(literal)

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Cantoni, M 1,2; Bertacco, R 1,2; Brambilla, A 3,4; Finazzi, M 3,4; Duo, L 3,4; Ciccacci, F 3,4; Verdini, A 5; Floreano, L 5; Morgante, A 5,6; Passoni, M 7,8; Casari, CS 7,8,9; Bassi, AL 7,8,9 (literal)

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Note

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1. Politecn Milan, Dipartimento Fis, CNISM, I-22100 Como, Italy 2. Politecn Milan, Dipartimento Fis, LNESS, I-22100 Como, Italy 3. Politecn Milan, Dipartimento Fis, LNESS, I-20133 Milan, Italy 4. Politecn Milan, Dipartimento Fis, CNISM, I-20133 Milan, Italy 5. CNR, IOM, Lab Nazl TASC, I-34149 Trieste, Italy 6. Univ Trieste, Dept Phys, I-34127 Trieste, Italy 7. Politecn Milan, NEMAS Ctr NanoEngineered Mat & Surfaces, I-20133 Milan, Italy 8. Politecn Milan, Dipartimento Energia, I-20133 Milan, Italy 9. Ctr Nano Sci & Technol Polimi, Ist Italiano Tecnol, I-20133 Milan, Italy (literal)

Titolo

Fe nanoparticles on ZnSe: Reversible temperature dependence of the surface barrier potential (literal)

Abstract

he Fe growth on ZnSe(001) takes place via the initial formation of superparamagnetic nano-islands that subsequently coalesce, giving rise to a continuous film for a nominal thickness of 8 Fe monolayers. For a very low Fe coverage (2 Fe monolayers), we show that the surface barrier potential (i.e. the barrier potential seen by electrons incident on the surface), measured by absorbed current spectroscopy, attains very large values (6.9 eV at room temperature) and dramatically changes as a function of temperature, with an increase of similar to 1.5 eV from room temperature down to 130 K, largely exceeding similar changes observed in both thin films and nanoparticles. This phenomenon disappears as the thickness increases and is fully reversible with temperature. Nonequilibrium phenomena due to the experimental conditions are present, but are not able to explain the observed data. Inverse photoemission, core level photoemission, x-ray photoemission diffraction, and scanning tunneling microscopy are employed in order to find temperature-dependent properties of the Fe islands: while only minor changes as a function of temperature are present in the electronic band structure, the Fe crystal structure, and the morphology of the islands, a noticeable temperature dependence of the Se segregation through the Fe islands is found. (literal)

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