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The antiferromagnetic domain structure in LaFeO${}_{3}$ thin-film epilayers grown on La${}_{0.7}$Sr${}_{0.3}$MnO${}_{3}$ is imaged combining linearly polarized x-ray-absorption spectroscopy with photoemission electron microscopy. Detailed analysis of polarization-dependent domain contrast from magnetic dichroism reveals two sets of symmetrically different antiferromagnetic easy axes in the LaFeO${}_{3}$ layer along the in-plane $\ensuremath{\langle}110\ensuremath{\rangle}$ and $\ensuremath{\langle}100\ensuremath{\rangle}$ crystalline axes (pseudocubic notation), respectively. We show that extended antiferromagnetic domains can be stabilized selectively for nanowires defined in this perovskite thin-film system along either orientation of the easy axes. The results demonstrate how the equilibrium domain structure of thin-film nanoscale antiferromagnets depend on a combination of substrate symmetry, nanowire dimensions, and in-plane crystalline orientation.

physical review. b, condensed matter and materials physics

Effects of nanostructuring and substrate symmetry on antiferromagnetic domain structure in LaFeO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>thin films

Effects of nanostructuring and substrate symmetry on antiferromagnetic domain structure in LaFeO3thin films