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Nuclear resonant reflectivity with standing waves for the investigation of a thin Fe layer buried inside a superconducting Si/[Mo/Si]45/Fe/Nb multilayer |
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| Authors: | MA Andreeva NG Monina B Lindgren S Kamali-M SN Vdovichev VG Semenov R Rüffer |
| Affiliation: | a Faculty of Physics, M.V. Lomonosov Moscow State University, 119992 Moscow, Russia b Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden c Institute of Chemistry, University of Bialystok, 15 399 Bialystok, Poland d Institute for Physics of Microstructures RAS, 603600 Nizhny Novgorod, Russia e Institute of Chemistry, St. Petersburg State University, 199164 St. Petersburg, Russia f European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France |
| Abstract: | A special multilayer sample Si/Mo/Si]45/57Fe/Nb has been prepared for the depth selective investigations of the hyperfine fields in thin iron layer at low temperatures above and below the superconducting transition in the top Nb layer (Tc ∼ 8 K) by means of the nuclear resonant reflectivity with standing waves. The periodic multilayer Mo/Si]45 below the iron layer in our sample was used as “a standing wave generator”. A weak magnetic hyperfine splitting in the 57Fe layer was detected just at low temperature. A slight variation of the nuclear resonant reflectivity time spectra measured above and below Tc was observed. At first it was supposed that this change of the spectrum shape is caused by the spatial modulation of ferromagnetic domains in the 57Fe layer caused by a proximity effect. A closer analysis, however, reveals that the spectrum variations are due to just the changes of the relative weights of the magnetic and paramagnetic phases in 57Fe layer. |
| Keywords: | 61 10 Kw 76 80 +y 75 70 &minus i 74 50 +r |
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