Ferromagnet–superconductor hybrids

By I. Lyuksyutov, V. Pokrovsky. 2004

292 citations recorded by the source corpus.

The new class of phenomena described in this review is based on the interaction between spatially separated, but closely located ferromagnets and superconductors, the so-called ferromagnet–superconductor hybrids (FSH). Typical FSH are: coupled uniform and textured ferromagnetic and superconducting films, magnetic dots over a superconducting film, magnetic nanowires in a superconducting matrix, etc. The interaction is provided by the magnetic field generated by magnetic textures and supercurrents. The magnetic flux from magnetic structures or topological defects can pin vortices or create them, changing the transport properties and transition temperature of the superconductor. On the other hand, the magnetic field from supercurrents (vortices) strongly interacts with the magnetic subsystem, leading to formation of coupled magnetic–superconducting topological defects.  Each time the Nambu and spin matrices are written together we mean the direct product. The proximity of ferromagnetic layer dramatically changes the properties of the superconducting film. The exchange field in ferromagnets not only suppresses the Cooper-pair wavefunction, but also leads to its oscillations, which in turn leads to oscillations of observable values: the transition temperature and Josephson current. In particular, in the ground state of the Josephson junction the relative phase of two superconductors separated by a layer of ferromagnetic metal is equal to π instead of the usual zero (the so-called π-junction). Such a junction carries a spontaneous supercurrent and possesses other unusual properties. Theory predicts that rotation of magnetization transforms s-pairing into p-pairing. The latter is not suppressed by the exchange field and serves as a carrier of long-range interaction between superconductors.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/06aa8b3667bc397d7cdcfba034289652f85dd591

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In Condensed Matter Physics

1. F. Bergeret
2. A. Volkov
3. G. Khaliullin
4. Bernhard Keimer
5. K. Efetov
6. J. Linder
7. J. Knolle
8. I. Kimchi

In Electronic, Optical and Magnetic Materials

1. F. Bergeret
2. A. Volkov
3. G. Khaliullin
4. Bernhard Keimer
5. K. Efetov
6. J. Knolle
7. I. Kimchi

In Materials Chemistry

1. Bernhard Keimer
2. K. Efetov

Citations in the corpus

• Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids (2009, background): “c superconductors interact with magnetic textures mainly via stray magnetic fields: blue bars correspond to the experimental papers, while white bars refer to pure theoretical contributions. Pokrovsky [33] addressed the physical implications of both electromagnetic coupling and exchange interaction i”
• Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures (2005, background): “roach in the theory of superconductivity. We should mention that several review articles on S/F related topics have been published recently (Buzdin, 2005a; Golubov et al., 2004; Izyumov et al., 2002; Lyuksyutov and Pokrovsky, 2004). In these reviews various properties of the S/F structures are discu”
• Magnetism at the interface between ferromagnetic and superconducting oxides (2006, background): “In particular, experiments on trilayer sandwiches comprising elemental singlet superconductors and ferromagnets have revealed a sign alternation of the superconducting phase in adjacent layers, as well as hints of an oscillatory dependence of the superconducting transition temperature on the ferroma”