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The coexistence of superconductivity and ferromagnetism is a long-standingissue in the realm of unconventional superconductivity due to the antagonisticnature of these two ordered states. Experimentally identifying andcharacterizing novel heterointerface superconductors that coexist withmagnetism is challenging. Here, we report the experimental observation oflong-range ferromagnetic order at the verge of two-dimensionalsuperconductivity at KTaO$_3$ heterointerfaces. Remarkably, we observe in-planemagnetization hysteresis loop persisting to above room temperature with directcurrent superconducting quantum interference device measurements. Furthermore,both the first-principles calculations and the x-ray magnetic circulardichroism measurements reveal that the observed robust ferromagnetism isattributed to the presence of oxygen vacancies that localize electrons innearby Ta 5$d$ states. Our findings not only indicate KTaO$_3$ heterointerfacesas unconventional superconductors with time-reversal symmetry breaking, butalso inject a new momentum to the study of the delicate interplay betweensuperconductivity and magnetism boosted by strong spin-orbit coupling inherentto the heavy Ta in 5$d$ orbitals of KTaO$_3$ heterointerfaces.

Signature of the coexistence of ferromagnetism and superconductivity at KTaO$_3$ heterointerfaces