Magnetism does not favour superconductivity in general. However, their coexistence is observed in a few unconventional superconductors, e.g. Fe-based and heavy fermion systems. In the infinite‑layer nickelate (Sm/Eu/Ca)NiO₂ (SECNO) system, field-reentrant superconductivity due to Jaccarino–Peter compensation induced by Eu²⁺ moments is recently reported. In this talk, I will present the observation of a butterfly‑shaped hysteretic superconducting transition in SECNO at ultralow temperatures, where magnetotransport measurements show strong field‑history dependence with a coercive field exceeding 1 T. The hysteretic behavior in magnetoresistance is also observed outside the superconducting regime, suggesting a potential ferromagnetic ground state across the SECNO series. To study the magnetic state in this system, we use low‑energy muon spin rotation (LE‑μSR) and polarized neutron reflectometry (PNR) to probe the magnetization and its spatial distribution. These measurements show that increasing Eu concentration leads to a more spatially homogeneous magnetic response but a reduced net magnetization. While the origin of the hysteretic ferromagnetic‑like ground state remains uncertain, SECNO emerges as a system in which superconductivity and ferromagnetism coexist, offering a new avenue for explorations.