Cryptoferromagnetic state in CuNi/Nb bilayer
Magnetic properties of superconductors (S) and ferromagnets (FM) are opposite to each other, magnetic field freely penetrate in the FM, while S try to expel it. Ferromagnetism aligns electrons spins parallel, while superconductivity - antiparallel (Cooper pairs), so that both phenomena are antagonistic by nature. One can however find conditions where these antagonists can coexist. One such possibility is called cryptoferromagnetic (CFM) state. One of candidate for observation of CFM phase is CuNi/Nb system, because CuNi is weak FM, with Curie temperature about 150 K for thin film. The most direct method for detecting CFM phase transition is Grazing Incidence Small Angle Neutron Scattering (GISANS), which make possible to detect inhomogeneites such as small CFM domains.
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ZHAKETOV Vladimir; DEVISHVILI Anton; GUASCO Laura; KHAYDUKOV Yury; Gideok Kim and RADU. (2019). Cryptoferromagnetic state in CuNi/Nb bilayer. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-269
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