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Structure and magnetism of V-doped SnO2 thin films: effect of the substrate

Jun Zhang1,2, R Skomski1,2, L P Yue1,2, Y F Lu2,3 and D J Sellmyer1,2

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We report on the structure and magnetism of V-doped SnO2 thin films grown by pulsed laser deposition. The structure and magnetic properties of the films strongly depend on the substrates on which the films are grown. Films grown on Al2O3 substrates are single crystalline and show anisotropic in-plane magnetic moments, while films grown on Si substrates are nanocrystalline and show no anisotropy. Compared with that of single-crystalline films, the magnetic moment of nanocrystalline films is higher at low V concentration, decreases more quickly as the V concentration increases, and is more sensitive to vacuum annealing. Our results suggest important roles for spin–orbit coupling and defects in the magnetism of diluted magnetic oxides.


PACS

68.55.-a Thin film structure and morphology

71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect

75.30.Cr Saturation moments and magnetic susceptibilities

75.30.Gw Magnetic anisotropy

75.50.Dd Nonmetallic ferromagnetic materials

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 25 (27 June 2007)

Received 15 April 2007

Published 5 June 2007



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