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The magnetic correlations at the superconductor/ferromagnet (S/F) interfacesplay a crucial role in realizing dissipation-less spin-based logic and memorytechnologies, such as triplet-supercurrent spin-valves and "{\pi}" Josephsonjunctions. Here we report the coexistence of an induced large magnetic momentand a crypto ferromagnetic state at high-quality nitride S/F interfaces. Usingpolarized neutron reflectometry and d. c. SQUID measurements, we quantitativelydetermined the magnetization profile of S/F bilayer and confirmed the inducedmagnetic moment in the adjacent superconductor only exists below TC.Interestingly, the direction of the induced moment in the superconductors wasunexpectedly parallel to that in the ferromagnet, which contrasts with earlierfindings in S/F heterostructures based on metals or oxides. Thefirst-principles calculations verify the observed unusual interfacial spintexture is caused by the Heisenberg direct exchange coupling through d orbitaloverlapping and severe charge transfer across the interfaces. Our workestablishes an incisive experimental probe for understanding the magneticproximity behavior at S/F interfaces and provides a prototype epitaxialbuilding block for superconducting spintronics.

Syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides