Structural and magnetic characterization of Fe0.3Ti0.7O2-δ films obtained by pulsed laser deposition

• Published in: Physica. B, Condensed matter Condensed matter, 2006-10, Vol.384 (1-2), p.341-344
• Main Authors: RODRIGUEZ TORRES, Claudia E, DUHALDE, Stella, FABIANA CABRERA, A, SANCHEZ, Francisco H, CHILLIOTE, Claudio, FLORENCIA VIGNOLO, M
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetic properties of monolayers and thin films; Magnetic properties of surface, thin films and multilayers; Physics
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2006.06.039

We present a study of crystalline structure, local environment around the magnetic atoms and magnetic behaviour of Fe0.3Ti0.7O2-delta 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 2X10-3 and 10-2Pa). These films are ferromagnetic with coercivities around 0.03-0.04T. Fe atoms are found to be predominantly metallic Fe. Transparent films were obtained when deposition was performed at high O2 pressure (between 4 and 20Pa). Fe atoms are mainly in +3 valence state. These films have a component magnetically ordered probably corresponding to alpha-Fe(Ti)2O3 and a paramagnetic one attributed to Fe substituted anatase. After a thermal treatment Fe changes to +2 valence state and alpha-Fe(Ti)2O3 orders in the ilmenite phase increasing ten times the saturation magnetization of the magnetically ordered (hysteretic) component.