Epitaxial growth of thin films of X-type Sr2Co2Fe28O46 hexaferrite by chemical solution deposition

Although single crystals of hexaferrites have received considerable attention, the same does not apply for thin films. Here, the growth of epitaxial thin films of Sr2Co2Fe28O46 on a SrTiO3(111) by a chemical solution deposition method is reported. Using X-ray diffraction analysis, the orientation relationship between film and substrate was established as (000l)X || (111)STO and 112̅0X || 101̅STO. The magnetization and magnetic domain structure were investigated using magnetic measurements and Lorentz transmission electron microscopy, respectively. With changing temperature, the magnitude of magnetization in the (0001) plane changed at ∼355 K, while that along the [0001] direction remained almost unchanged, suggesting a spin reorientation transition. Using the ferromagnetic resonance method, it was shown that the compound exhibits a change in the orientation of the magnetic anisotropy in the (0001) plane at ∼ 150 K that supports the occurrence of the multiaxial anisotropy state in film similar to that in single crystals.