Appearance of room temperature ferromagnetism in Cu-doped TiO2-delta

S. DUHALDE, M. F. VIGNOLO, C. CHILIOTTE, C. E. RODRÍGUEZ TORRES, L. A. ERRICO, A. F. CABRERA, M. RENTERÍA, F. H. SÁNCHEZ, AND M. WEISSMANN

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

The American Physical Society

Lugar: New York; Año: 2005 vol. 72 p. 161313 - 161313

0163-1829

La referencia correcta es: phys. Rev. B 72, R161313-1, siendo la última página R161313-4 (4 páginas). El sistema no permite ingresar caracteres alfanuméricos. We report here the unexpected observation of significant room temperature ferromagnetism in a semiconductor doped with nonmagnetic impurities, Cu-doped TiO2 thin films grown by Pulsed Laser Deposition. The magnetic moment, calculated from the magnetization curves, resulted surprisingly large, about 1.5 mB per Cu atom. A large magnetic moment was also obtained from calculations , but only if an oxygen vacancy in the nearest-neighbor shell of Cu was present. This result suggests that the role of oxygen vacancies is crucial for the appearance of ferromagnetism. The calculations also predict that Cu doping favors the formation of oxygen vacancies.