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We demonstrate that combining standing-wave (SW) excitation with resonantinelastic x-ray scattering (RIXS) can lead to depth resolution and interfacesensitivity for studying orbital and magnetic excitations in correlated oxideheterostructures. SW-RIXS has been applied to multilayer heterostructuresconsisting of a superconductor La$_{1.85}$Sr$_{0.15}$CuO$_{4}$(LSCO) and ahalf-metallic ferromagnet La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ (LSMO). Easilyobservable SW effects on the RIXS excitations were found in these LSCO/LSMOmultilayers. In addition, we observe different depth distribution of the RIXSexcitations. The magnetic excitations are found to arise from the LSCO/LSMOinterfaces, and there is also a suggestion that one of the dd excitations comesfrom the interfaces. SW-RIXS measurements of correlated-oxide and othermultilayer heterostructures should provide unique layer-resolved insightsconcerning their orbital and magnetic excitations, as well as a challenge forRIXS theory to specifically deal with interface effects.

Depth-resolved resonant inelastic x-ray scattering at a superconductor/half-metallic ferromagnet interface through standing-wave excitation