Orientation-dependent magnetism and orbital structure of strained YTiO${}_3$ films on LaAlO${}_3$ substrates

Abstract

The strain tuned magnetism of YTiO${}_3$ film grown on the LaAlO${}_3$ ($110$) substrate is studied by the method of the first principles, and compared with that of the ($001$)-oriented one. The obtained magnetism is totally different, which is ferromagnetic for the film on the ($110$) substrate but A-type antiferromagnetic on the ($001$) one. This orientation-dependent magnetism is attributed to the subtle orbital ordering of YTiO${}_3$ film. The $d_{xz}$/$d_{yz}$-type orbital ordering is predominant for the ($001$) one, but for the ($110$) case, the $d_{xy}$ orbital is mostly occupied plus a few contribution from the $d_{xz}$/$d_{yz}$ orbital. Moreover, the lattice mismatch is modest for the ($110$) case but more serious for the ($001$) one, which is also responsible for this contrasting magnetism.

4 pages, 4 figures; Proceeding of the 59th Annual Magnetism and Magnetic Materials (MMM) Conference

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