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SrRuO$_3$ (SRO113) is an important material for device physics particularlyas one of the best metallic oxide electrodes for ferroelectric devices. Thisoxide has moderate electron correlations with novel properties includingferromagnetic ordering, which can be utilized in future to spintronics andsuperconducting spintronics devices. Recently, we observed strongly enhancedmagnetization of SRO113 thin films grown on single crystals of the spin-tripletsuperconductor Sr$_2$RuO$_4$ (SRO214). To clarify the origin of such anenhancement, we conducted systematic investigations of magnetic properties ofSRO113 films deposited on a variety of oxide substrates. We carefullysubtracted the substrate contributions and found that the enhanced 2magnetization occurs only for SRO113/SRO214 films. We further found thatneither strain nor metallicity of the substrate plays any significant roles inthe enhancement. The X-ray magnetic circular dichroism reveals that thesubstrate-induced strain does not switch the Ru4+ state from the low-spin tohigh-spin states. The film-thickness dependence of the magnetization ofSRO113/SRO214 films strongly suggest that the additional magnetization arisesdue to the induction of magnetic moment into the SRO214 substrate over 20-nmdepth. Our results imply new magnetic functionality that can trigger studiessearching for yet unknown physical phenomena in magnetic ruthenates.

Induced ferromagnetic moment at the interface between epitaxial SrRuO$_3$ film and Sr$_2$RuO$_4$ single crystal