Proximity effects:
Superconductivity is a state of matter when electrons are paired together. In a conventional superconductor, phonon interactions pair electrons together with opposite spin.
Magnetism is another state of matter when electrons localized to nuclei or molecules in a system manipulate the spin of an electron.
When superconductivity and magnetism are placed in proximity to each other, the paired spins of the superconducting state act in competition to the spin-alignment of a ferromagnetic magnet, an interesting competition of effects can appear.
A review paper is here:
A. Bill, J. de Rojas, T.E. Baker, and A. Richie-Halford, "Properties of magnetic-superconducting proximity systems" J. Super Novel Mag. 25, 27 (2012) [online] [pdf] [bibtex]
For some other papers where these ideas are explored:
T.E. Baker and A. Bill, "Role of canting and depleted-triplet minima in superconducting-spin valve structures" Phys. Rev. B 97, 214520 (2018) [online] [arxiv:1802.08196] [pdf] [bibtex]
T.E. Baker, A. Richie-Halford, and A. Bill, "Classification of pair correlations and 0-π transitions in superconducting-magnetic hybrid structures" Phys. Rev. B 94, 104518 (2016) [online] [arxiv:1606.05567] [pdf] [bibtex]
T.E. Baker and A. Bill, "Effects from magnetic boundary conditions in superconducting-magnetic proximity effects" AIP Advances 6, 055811 (2016) [online] [pdf] [bibtex]
T.E. Baker, A. Richie-Halford, O.E. Icreverzi, and A. Bill, "Cascading proximity effects in rotating magnetizations" Europhys. Lett. 107, 17001 (2014) [online] [arxiv:1403.4149] [pdf] [bibtex]
M.Sc. thesis, Superconducting--Magnetic Proximity Systems and Mathematical Analogies to Classical Mechanics (2012) [online] [pdf] [bibtex]
T.E. Baker, A. Richie-Halford, and A. Bill, "Long range triplet Josephson currents and the 0-π transition in tunable domain walls" 16, 093048 (2014) [Video abstract] [online] [arxiv:1310.6580] [pdf] [bibtex]
T.E. Baker, O.E. Icreverzi, and A. Bill, "Classical mechanical analogies in wide dirty SFS junctions" J. Super. Novel Mag. 25, 7 (2012) [online] [pdf] [bibtex]