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The authors investigated the structure and properties ofGdBaCo$_{2}$O$_{5.5+\delta}$ thin films epitaxially grown on SrTiO$_{3}$ (001)single crystal substrates. The thin films were found to have a notable remnantmagnetization above room temperature, which is much higher than that observedin bulk material. Transmission electron microscopy and x-ray diffractionpatterns reveal that phase separation occurs in these films, and the phaseresponsible for the enhanced ferromagnetic order is $a$-oriented. The enhancedferromagnetic order is attributed to the enhanced orbital order of Co$^{3+}$ inCoO$_{5}$ pyramids, and the disappearance of ferromagnetic to antiferromagnetictransition is explained the stabilization of higher spin state of Co$^{3+}$ inCoO$_{6}$ octahedra.

Enhanced Ferromagnetic Ordering in GdBaCo$_{2}$O$_{5.5+\delta}$ Films on SrTiO3 (001) Substrate