Inhomogeneous Current Distribution in a Bimetal Ferromagnet/Superconductor Film in a Longitudinal Magnetic Field

2009 ◽  
Vol 152-153 ◽  
pp. 462-465 ◽  
Author(s):  
Maxim Avdeev ◽  
Mansur G. Khusainov ◽  
Yurii N. Proshin ◽  
Sergey Tsarevskii
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Current Distribution ◽  
Proximity Effect ◽  
Longitudinal Magnetic Field ◽  
Dirty Limit ◽  
Distribution Versus ◽  
Superconductor Film ◽  
Interface Transparency ◽  
Superconducting Current

The proximity effect of the ferromagnetic metal/superconductor (FM/S) bilayers in а external longitudinal magnetic field is considered in the dirty limit. The critical temperature and the superconducting current distribution versus applied magnetic field’s magnitude, film’s thicknesses and a transparency of the contact is calculated, with taking into account аn umklapp processes possibility on the interface of the FM/S contact. It is shown that superconducting current is strictly inhomogeneous and asymmetrical. It is shown also that the current inhomogeneity depends heavily from the FM/S interface transparency.

Proximity Effect as a Probe of Electronic Correlations and Exchange Field in Dirty Ferromagnet/Superconductor Nanostructures

2009 ◽  
Vol 152-153 ◽  
pp. 457-461
Author(s):  
Larisa A. Terentieva ◽  
Elena L. Parfenova ◽  
Mansur G. Khusainov ◽  
Yurii N. Proshin
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Proximity Effect ◽  
Order Parameter ◽  
Weak Magnetic Field ◽  
Exchange Field ◽  
Electronic Correlations ◽  
Electron Repulsion ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

We investigate the interplay between the BCS and 2D Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) states in the dirty thin ferromagnetic metal/superconductor (FM/S) nanostructures. For the FM/S bilayers we have derived the dependencies of critical temperature on the FM layer exchange field, electronic correlations and thickness. Moreover, in the corresponding FM/S/FM trilayers we predict two new π phase superconducting states with electron-electron repulsion in the FM layers. The 2D modulated LOFF states are possible in such trilayers only in presence of a weak magnetic field and at suitable parameters of the FM and S layers. On this base we originally propose the method of proximity effect probe the magnitude and sign of the electronic correlations, the order parameter symmetry and exchange fields in various FM layers.

scholarly journals TRANSPORT AND TRIPLET SUPERCONDUCTING CONDENSATE IN MESOSCOPIC FERROMAGNET-SUPERCONDUCTOR STRUCTURES

2002 ◽  
Vol 16 (10) ◽  
pp. 1459-1478 ◽  
Author(s):  
F. S. BERGERET ◽  
V. V. PAVLOVSKII ◽  
A. F. VOLKOV ◽  
K. B. EFETOV
Keyword(s):  
Critical Temperature ◽  
Normal State ◽  
Proximity Effect ◽  
Exchange Field ◽  
Local Inhomogeneity ◽  
Dirty Limit ◽  
Mesoscopic Structure ◽  
Superconducting Condensate

We calculate the conductance of a superconductor/ferromagnet (S/F) mesoscopic structure in the dirty limit. First we assume that the ferromagnet exhibits a homogeneous magnetization and consider the case that the penetration of the condensate into the F wire is negligible and the case in which the proximity effect is taken into account. It is shown that if the exchange field is large enough, the conductance below the critical temperature T c , is always smaller than the conductance in the normal state. At last, we calculate the conductance for a F/S structure with a local inhomogeneity of the magnetization in the ferromagnet. We demonstrate that a triplet component of the condensate is induced in the F wire. This leads to a increase of the conductance below T c .

Proximity Effect for Asymmetrical Three-Layered FS Structures in External Magnetic Field

2012 ◽  
Vol 190 ◽  
pp. 387-390
Author(s):  
Maxim Avdeev ◽  
Yurii N. Proshin ◽  
Mansur G. Khusainov ◽  
Sergey Tsarevskii
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
External Magnetic Field ◽  
Boundary Value Problem ◽  
Proximity Effect ◽  
Boundary Value ◽  
Netic Field

We study asymmetrical three-layers F1F2S and F1SF2 structures in an external parallelmag-netic field. Assuming that all F and S layers are dirty, we solve the boundary value problem for theUsadel function. We calculate the critical temperature of in the F1F2S and F1SF2 systems as functionof the F layers thicknesses and external magnetic field.

Superconducting Probe of Electronic Correlations and Exchange Field Based on the Proximity Effect in F/S Nanostructures

2012 ◽  
Vol 190 ◽  
pp. 413-416
Author(s):  
M. G. Khusainov ◽  
M. M. Khusainov ◽  
Y. N. Proshin
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Proximity Effect ◽  
Order Parameter ◽  
Weak Magnetic Field ◽  
Exchange Field ◽  
Electron Correlations ◽  
Coupling Constant ◽  
Short Period ◽  
Probe Spectroscopy

The proximity effect and competition between the BCS and LOFF states are studied in the Cooper limit for thin F/S and F/S/F nanostructures, where F is a ferromagnet and S is a superconductor. The dependences of the critical temperature Tc on the exchange field I, electron correlations λf, and the thickness df of the F layer are derived for F/S bilayers and F/S/F trilayers. Two new π-phase superconducting states with electronelectron repulsion in the F layers of F/S/F trilayers are predicted. A 2D LOFF state in F/S/F trilayers is possible only in the presence of a weak magnetic field and the appropriate parameters of the F and S layers. The absence of the suppression of 3D superconductivity in short-period Gd/La superlattices is explained and the electronelectron coupling constant in gadolinium is predicted. A method of superconducting probe spectroscopy based on the proximity effect is proposed for determining the symmetry of the order parameter, the magnitude and sign of electron correlations, and the exchange field in various nanomagnets F.

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