252 research outputs found
Influence of s-d scattering on the electron density of states in ferromagnet/superconductor bilayer
We study the dependence of the electronic density of states (DOS) on the
distance from the boundary for a ferromagnet/superconductor bilayer. We
calculate the electron density of states in such structure taking into account
the two-band model of the ferromagnet (FM) with conducting s and localized d
electrons and a simple s-wave superconductor (SC). It is demonstrated that due
to the electron s-d scattering in the ferromagnetic layer in the third order of
s-d scattering parameter the oscillation of the density of states has larger
period and more drastic decrease in comparison with the oscillation period for
the electron density of states in the zero order.Comment: 5 pages, 3 figure
Proximity effect in atomic-scaled hybrid superconductor/ferromagnet structures: crucial role of electron spectra
We study the influence of the configuration of the majority and minority spin
subbands of electron spectra on the properties of atomic-scaled
superconductor-ferromagnet S-F-S and F-S-F hybrid structures. At low
temperatures, the S/F/S junction is either a 0 or junction depending on the
energy shift between S and F materials and the anisotropy of the Fermi
surfaces. We found that the spin switch effect in F/S/F system can be reversed
if the minority spin electron spectra in F metal is of the hole-like type
Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
We report magnetic and electrical measurements of Nb Josephson junctions with
strongly ferromagnetic barriers of Co, Ni and Ni80Fe20 (Py). All these
materials show multiple oscillations of critical current with barrier thickness
implying repeated 0-pi phase-transitions in the superconducting order
parameter. We show in particular that the Co barrier devices can be accurately
modelled using existing clean limit theories and so that, despite the high
exchange energy (309 meV), the large IcRN value in the pi-state means Co
barriers are ideally suited to the practical development of superconducting
pi-shift devices.Comment: 4 pages 3 figures 1 table. Revised version as accepted for
publication. To appear in Physical Review Letter
Development of communicative competence as an object of foreign language teaching
The article deals with one of the most important objects of education, that is the communicative competence development of students. This competence is essential in the process of foreign language learning Its development is supposed to be foreign language acquisition and its using in a situation of communicationye
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