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At crystalline interfaces where a valence mismatch exists, electronic andstructural interactions may occur to relieve the polar mismatch leading to thestabilization of non-bulklike phases. We show that spontaneous reconstructionsat polar $La_{0.7}Sr_{0.3}MnO_3$ interfaces are correlated with suppressedferromagnetism for film thicknesses on the order of a unit cell. We investigatethe structural and magnetic properties of valence-matched$La_{0.7}Sr_{0.3}CrO_3$ - $La_{0.7}Sr_{0.3}MnO_3$ interfaces using acombination of high-resolution electron microscopy, first principles theory,synchrotron X-ray scattering and magnetic spectroscopy andtemperature-dependent magnetometry. A combination of an antiferromagneticcoupling between the $La_{0.7}Sr_{0.3}CrO_3$ and $La_{0.7}Sr_{0.3}MnO_3$ layersand a suppression of interfacial polar distortions are found to result inrobust long range ferromagnetic ordering for ultra-thin$La_{0.7}Sr_{0.3}MnO_3$. These results underscore the critical importance ofinterfacial structural and magnetic interactions in the design of devices basedon two-dimensional oxide magnetic systems.

Confinement of magnetism in atomically-thin $La_{0.7}Sr_{0.3}CrO_3$/$La_{0.7}Sr_{0.3}MnO_3$ heterostructures