Oxygen Deficiency and Room Temperature Ferromagnetism in Undoped and Cobalt-Doped $\hbox{TiO}_{\bm 2}$ Nanoparticles

Abstract

The compositional analysis done on the synthesized undoped and cobalt (Co)-doped titanium dioxide ( TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) nanoparticles by X-ray photoelectron spectroscopy and energy dispersive X-ray analysis suggests oxygen deficiency in undoped and Co-doped TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> samples. Magnetic investigations by vibrating sample magnetometer (VSM) indicate that undoped TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoparticles possess ferromagnetic ordering at room temperature due to the oxygen deficiency and in Co-doped TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , the enhancement in magnetic moment is due to Co doping.