Abstract
The influence of thermal annealings onLa0.9Ca0.1MnO3 (LCMO) films in oxygen and in vacuum with low hole doping is investigated in thephase separation region where competition between AFM and FM phases is high.Measurements by x-ray diffractometry, atomic force microscopy and magnetometryreveal changes in the lattice parameters and magnetic properties of the films,depending on the oxygen content. All films show magnetic cluster glass properties withsimilar freezing temperatures of around 45 K. Clearly the highest increase of themagnetization is observed in the films annealed in vacuum. We attribute this effect totrapping of unpaired electrons at oxygen vacancies where they can form rigidself-trapped magnetic polarons in potential wells of local moments. As a resultlong-range spin distortions with local ferromagnetic order may be realized. Inconformity with these results, photoinduced persistent magnetization showing differentmechanisms of generation, depending on the method of thermal annealing, is observed.
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