ИСТИНА

The contact of superconducting (S) and ferromagnetic (F) materials leads to various interesting interactions called proximity effects. Heterostructures of thin alternating S and F layers are the best platform for such studies. The influence of magnetism on superconductivity is manifested in the phase change of the superconducting wave function (”π-phase superconductivity”) and spin-triplet Cooper pairing. The effect of superconductivity on the magnetic state is less studied. Structures with niobium and rare-earth metals (RE) can be promising systems for such researches. The advantage of such systems is the high transparency of the interface, which simplifies penetration of superconducting correlations in F system. REs also have weak ferromagnetism, which equalize energies of both interactions and facilitates the effect of proximity. In this work, holmium and dysprosium, which have a helimagnetic noncollinear structure, were used as REs. We demonstrated changes in their magnetic ordering under the influence of superconductivity using polarized neutron reflectometry.