Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Surface and Interface Magnetism II (jointly with O)
MA 34.4: Vortrag
Donnerstag, 14. März 2013, 11:15–11:30, H33
Inverse proximity effects in superconductor/ferromagnet bilayer explored by polarized neutron reflectometry — •Yury Khaydukov1, Bela Nagy2, Jung-Hwa Kim1, Thomas Keller1, Laszlo Bottyan2, and Bernhard Keimer1 — 1Max-Planck Institute for Solid State Research, Stuttgart, Germany — 2Wigner Research Centre for Physics, Budapest, Hungary
The inverse proximity effect, i.e. the appearance of magnetic correlations in the superconductor (S) close to the interface with a ferromagnet (F) was first considered theoretically in early 2000s. The origin of this effect is the exchange coupling of free (itinerant) electrons near the S/F interface. The spin up electron of a Cooper pair would prefer to be located in ferromagnetic region while spin down electrons would remain in the superconducting region This leads to the development of a magnetic sublayer within the S layer close to the interface with its magnetization antiparallel to the magnetization of free electrons of F layer Me. Thickness of the sublayer is comparable with the superconducting coherence length, ξ. We studied the effect using different methods including transport measurements, SQUID magnetometry etc. However, the main method which allowed us to get the information about the thickness of proximity induced magnetic sublayer was Polarized Neutron Reflectometry . Dependence of this effect (sign and size) on the temperature, coherence length of the S layer ξ, exchange coupling strength of the F layer will be discussed in details.