Abstract
LaBaCo2O6−δ (LBCO) films were grown on MgO substrates by a pulsed laser deposition method in O2 atmosphere of 2 × 10−4 and 2 Pa. The LBCO films are epitaxial, but actually consist of 90°-oriented ordered LaBaCo2O6 grains in O-annealed samples. Paramagnetic to ferromagnetic transition occurs at ~200 K and the coercive fields at 10 K are as high as 8.8 and 7.2 kOe for the O-annealed low- and high-oxygen LBCO films, respectively. The high coercive fields are attributed to the co-existed 90°-oriented grains, which play a role in locking magnetic spins. A magnetization model of ferromagnetic nanoclusters is established and applied to the discussion of irreversibility in temperature-dependent magnetization curves and the fitting of magnetization loops at different temperatures, revealing that oxygen vacancies may have impacts on the magnetization of LBCO films. In addition, the electric transport properties were studied and linked to the growth behavior of LBCO films.
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