We present a study of crystalline structure, local environment around the magnetic atoms and magnetic behaviour of Fe0.3Ti0.7O2-δ films, produced by Pulsed Laser Deposition, as a function of oxygen pressure and substrate temperature. Dark films were obtained by deposition at low O2 pressure (between 2×10-3 and 10-2 Pa). These films are ferromagnetic with coercivities around 0.03-0.04 T. Fe atoms are found to be predominantly metallic Fe. Transparent films were obtained when deposition was performed at high O2 pressure (between 4 and 20 Pa). Fe atoms are mainly in +3 valence state. These films have a component magnetically ordered probably corresponding to α-Fe(Ti)2O3 and a paramagnetic one attributed to Fe substituted anatase. After a thermal treatment Fe changes to +2 valence state and α-Fe(Ti)2O3 orders in the ilmenite phase increasing ten times the saturation magnetization of the magnetically ordered (hysteretic) component. © 2006 Elsevier B.V. All rights reserved.
Documento: | Artículo |
Título: | Structural and magnetic characterization of Fe0.3Ti0.7O2-δ films obtained by pulsed laser deposition |
Autor: | Rodríguez Torres, C.E.; Duhalde, S.; Fabiana Cabrera, A.; Sánchez, F.H.; Chilliote, C.; Florencia Vignolo, M. |
Filiación: | Dpto. de Física-IFLP, Fac. C. Exactas, UNLP., C.C. 67, 1900 La Plata, Argentina Depto. de Física, Fac. Ingeniería, UBA, Paseo Colón 850, 1063 Buenos Aires, Argentina Fac. Ciencias Exactas y Naturales, UBA, Ciudad Universitaria, Buenos Aires, Argentina |
Palabras clave: | Fe doped TiO2 films; Magnetic semiconductors; Thin films; XAFS; Coercive force; Crystallization; Deposition; Ferromagnetic materials; Magnetization; Pulsed laser deposition; Titanium oxides; Fe doped TiO2 films; Magnetic characterization; Oxygen pressure; Transparent films; Thin films |
Año: | 2006 |
Volumen: | 384 |
Número: | 1-2 |
Página de inicio: | 341 |
Página de fin: | 344 |
DOI: | http://dx.doi.org/10.1016/j.physb.2006.06.039 |
Título revista: | Physica B: Condensed Matter |
Título revista abreviado: | Phys B Condens Matter |
ISSN: | 09214526 |
CODEN: | PHYBE |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v384_n1-2_p341_RodriguezTorres |