Constructing superlattices consisting of both 3
d and 5
d transition metal oxides is a feasible strategy to combine both strong spin-orbit coupling and magnetism in a single material. These materials are promising to be applied in future spintronic devices, magnetic sensors, etc. Here, we investigate the magnetic ordering and oxygen octahedral rotation in LaMnO
3/SrIrO
3 perovskite superlattice with strong spin-orbit coupling. Resonant magnetic
x-ray diffraction results reveal that the LaMnO
3/SrIrO
3 superlattice does not show in-plane antiferromagnetic ordering as other perovskite iridates, which may be attributed to the interfacial coupling between Mn 3
d and Ir 5
d orbitals. The investigation of non-resonant half-integer diffraction peaks indicate a similar oxygen octahedral rotation pattern as previous reports.
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