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Anti-site disorder is one of the most important issues that arises insynthesis of double perovskite for spintronic applications. Although it isknown that anti-site disorder leads to a proliferation of structural defects,known as the anti-phase boundaries that separate ordered anti-phase domains inthe sample, little is known about the magnetic correlation across theseanti-phase boundaries on a microscopic level. Motivated by this, we reportresonant elastic X-ray scattering study of room temperature magnetic andstructural correlation in a thin-film sample of Sr$_2$CrReO$_6$, which has oneof the highest $\mathrm{T_C}$ among double perovskites. Structurally, wediscovered existence of anti-phase nanodomains of $\sim$15~nm in the sample.Magnetically, the ordered moments are shown to lie perpendicular to the $c$direction. Most remarkably, we found that the magnetic correlation length farexceeds the size of individual anti-phase nanodomains. Our results thereforeprovide conclusive proof for existence of robust magnetic correlation acrossthe anti-phase boundaries in Sr$_2$CrReO$_6$.

Robust Long Range Magnetic Correlation across Anti-phase Domain Boundaries in Sr$_2$CrReO$_6$