  Transparent pure and Cu-doped (2.5, 5 and 10 at. %) anatase TiO2 thin films
were grown by pulsed laser deposition technique on LaAlO3 substrates. The
samples were structurally characterized by X-ray absorption spectroscopy and
X-ray diffraction. The magnetic properties were measured using a SQUID. All
films have a FM-like behaviour. In the case of the Cu-doped samples, the
magnetic cycles are almost independent of the Cu concentration. Cu atoms are
forming CuO and/or substituting Ti in TiO2. The thermal treatment in air
promotes the CuO segregation. Since CuO is antiferromagnetic, the magnetic
signals present in the films could be assigned to this Cu substitutionally
replacing cations in TiO2.
