A. Buzdin

Domain-wall superconductivity in hybrid superconductor-ferromagnet structures

On the basis of a phenomenological Ginzburg-Landau approach we investigate the problem of order parameter nucleation in hybrid superconductor-ferromagnet systems with a domain structure in an applied external magnetic field. Both isolated domain boundaries and periodic domain structures in ferromagnetic layers are considered. We study the interplay between superconductivity localized at the domain walls and far from the walls and show that such an interplay determines a peculiar field dependence of the critical temperature

Properties of superconductor/ferromagnet structures with spin-dependent scattering

{T}_{c}.

Electromagnetic pinning of vortices on different types of defects

For a periodic domain structure the behavior of the upper critical field of superconductivity nucleation near

Josephson coupling through ferromagnetic heterojunctions with noncollinear magnetizations

{T}_{c}

Types of Fulde-Ferrell-Larkin-Ovchinnikov states induced by anisotropy effects

is strongly influenced by the overlapping of the superconducting nuclei localized over different domains.

Theory of interplay of nuclear magnetism and superconductivity in AuIn{sub 2}

We investigate superconductor/ferromagnet (S/F) hybrid structures in the dirty limit, described by the Usadel equations. More precisely, the oscillations of the critical temperature and critical current with the thickness of the ferromagnetic layers are studied. We show that spin-flip and spin-orbit scattering lead to the decrease of the decay length and the increase of the oscillation period. The critical current decay is more sensitive to these pair-breaking mechanisms than that of the critical temperature. These two scattering mechanisms should be taken into account to get a better agreement between experimental results and theoretical descriptions. We also study the influence of the interface transparency on the properties of S/F structures.

Strong coupling superconductivity in heavy fermion systems

We consider the general case of vortex interaction with elliptic hollow cylinder at a distances smaller than the London penetration depth. For the first time, the analytical solution of this problem is obtained, which permits us to treat the case of a vortex near the insulating strip of finite length inside the superconductor. Our results are applicable to superconducting films with regular arrays of defects like elliptic holes (antidots) or segments (antisegments). It turns out that the interaction is basically governed by the largest dimension of the defect. We analyze how the collection of defects weakens the intervortex interaction and makes it anisotropic. The solution of the problem of vortex interaction with a cylindrical hole in anisotropic superconductor is obtained as well. Finally, we demonstrate how the surface defects suppress the field of the vortex entrance. This effect is very important for layered superconductors.

Field dependence study of the reversible magnetization in heavy ions irradiated thallium based single crystals

We study the Josephson effect in clean heterojunctions that consist of superconductors connected through two metallic ferromagnets with insulating interfaces. We solve the scattering problem based on the Bogoliubov-de Gennes equation for arbitrary relative orientation of in-plane magnetizations, transparency of interfaces, and mismatch of Fermi wave vectors. Both spin-singlet and -triplet superconducting correlations are taken into account, and the Josephson current is calculated as a function of thickness of ferromagnetic layers and of the angle

Properties of Vortex States Induced by Proximity Effect in Hybrid Ferromagnet-Superconductor Systems

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Josephson Coupling Through Ferromagnetic Bilayer With Non‐collinear Magnetizations

between their magnetizations. For relatively weak ferromagnets, we find that the critical Josephson current