253 research outputs found
МОДЕРНІЗАЦІЯ ОПЕРАЦІЙ РЕФІНАНСУВАННЯ БАНКІВ ЯК ЧИННИК СТАБІЛІЗАЦІЇ ФІНАНСОВО-КРЕДИТНОЇ СФЕРИ. (THE MODERNIZATION OF REFINANCING BANKS AS A FACTOR THE STABILIZATION OF THE FINANCIAL AND CREDIT SECTOR).
У статті розглянуто проблемні питання рефінансування починаючи з 2008 р. до теперішнього часу. На основі проведеного дослідження сучасного стану рефінансування запропоновано механізм рефінансування банківських
установ без використання коштів НБУ, який можна застосовувати для всіх проблемних банків. Такий підхід допо може прискорити здійснення заходів щодо рефінансування та уникнути відволікання коштів із реального сектора
економіки, а також гарантуватиме рефінансування всім проблемним банкам за рахунок створення для кожного з
них окремого санаційного фонду.
(In the article deals with the problematic issue of refinancing from 2008 to the present. Based on the current state of research of the mechanism of refinancing refinance banks without use of the NBU, which can be used for all problem banks.
This approach will help accelerate the implementation of measures on refinance and avoid diversion of funds from the real economy and ensure all refinancing troubled banks by creating for each individual sanation fund.
Symmetry Violation in a Superconducting Film with a Square Array of Ferromagnetic Dots
We study the equilibrium state of a superconducting film covered with a
regular square array of perpendicularly magnetized magnetic dots. The dots
induce vortices in the film directly under them and antivortices between the
dots. We show that the symmetry of the dot array is spontaneously violated by
the vortices. The positions of the vortices and the antivortices depend on the
magnetization and the size of the dots.Comment: 6 pages, 3 figure
Tunable pinning in superconducting films with magnetic micro-loops
We study the flux pinning properties of superconductor/magnetic micro-rings
lattice hybrid structures. The used open triangular micromagnets represent an
eight-fold degree of freedom system, with six polarized and two flux-closure
possible states. By conveniently choosing the magnetic state of the underlying
rings it is possible to induce different pinning potentials. We show that the
magnetic vortex state with minimum stray field produces a weaker pinning in
comparison with the polarized states
Broadband probing magnetization dynamics of the coupled vortex state permalloy layers in nanopillars
Broadband magnetization response of coupled vortex state magnetic dots in
layered nanopillars was explored as a function of in-plane magnetic field and
interlayer separation. For dipolarly coupled circular Py(25 nm)/Cu(20 nm)/Py(25
nm) nanopillars of 600 nm diameter, a small in-plane field splits the
eigenfrequencies of azimuthal spin wave modes inducing an abrupt transition
between in-phase and out-of-phase kinds of the low-lying coupled spin wave
modes. The critical field for this splitting is determined by antiparallel
chiralities of the vortices in the layers. Qualitatively similar (although more
gradual) changes occur also in the exchange coupled Py(25 nm)/Cu(1 nm)/Py(25
nm) tri-layer nanopillars. These findings are in qualitative agreement with
micromagnetic dynamic simulations
Novel pinning phenomena in a superconducting film with a square lattice of artificial pinning centers
We study the transport properties of a superconducting Nb film with a square
lattice of artificial pinning centers (APCs) as a function of dc current, at a
temperature close to the superconducting transition temperature of the film. We
find that, at low dc currents, the differential resistance of the film shows
the standard matching field anomaly, that is, the differential resistance has a
local minimum at magnetic fields corresponding to an integer number of flux
lines per APC. However, at higher dc currents, the differential resistance at
each matching field turns to a local maximum, which is exactly opposite to the
low current behavior. This novel effect might indicate that the flux lines in
the APC system change their flow mode as the dc current is increased.Comment: 10 pages, 4 figure
Ratchet Effects for Vortices in Superconductors with Periodic Pinning Arrays
Using numerical simulations we show that novel transport phenomena can occur
for vortices moving in periodic pinning arrays when two external perpendicular
ac drives are applied. In particular, we find a ratchet effect where the
vortices can have a net dc drift even in the absence of a dc drive. This
ratchet effect can occur for ac drives which create orbits that break one or
more reflection symmetries.Comment: 4 pages, 4 postscript figures; Proceedings of Third European
Conference on Vortex Matter in Superconductor
Magnetic dipole induced guided vortex motion
We present evidence of magnetically controlled guided vortex motion in a
hybrid superconductor/ferromagnet nanosystem consisting of an Al film on top of
a square array of permalloy square rings. When the rings are magnetized with an
in-plane external field H, an array of point-like dipoles with moments
antiparallel to H, is formed. The resulting magnetic template generates a
strongly anisotropic pinning potential landscape for vortices in the
superconducting layer. Transport measurements show that this anisotropy is able
to confine the flux motion along the high symmetry axes of the square lattice
of dipoles. This guided vortex motion can be either re-routed by 90 degrees by
simply changing the dipole orientation or even strongly suppressed by inducing
a flux-closure magnetic state with very low stray fields in the rings.Comment: 5 pages, 3 figure
Analysis of magnetoresistance in arrays of connected nano-rings
We study the anisotropic magnetoresistance (AME) of a 2D periodic square array of connected permalloy rings with periodicity of 1m combining experimental and computational techniques. The computational models consists of two parts: 1) the computation of the magnetization and 2) the computation of the current density. For 1), we use standard micromagnetic methods. For 2), we start from a potential difference applied across the sample, compute the resulting electric potential , and subsequently the corresponding current density based on a uniform conductiviy. We take into account the backreaction of the magnetoresistive effects onto the current density by self-consistently computing the current density and conductivity until they converge. We compare the experimentally measured AMR insight into the characteristics of the AMR data. Finally, we demonstrate the importance of taking into account the spatial variation of the current density when computing the AMR
Domain wall displacement in Py square ring for single nanometric magnetic bead detection
A new approach based on the domain wall displacement in confined
ferromagnetic nanostructures for attracting and sensing a single nanometric
magnetic particles is presented. We modeled and experimentally demonstrated the
viability of the approach using an anisotropic magnetoresistance device made by
a micron-size square ring of Permalloy designed for application in magnetic
storage. This detection concept can be suitable to biomolecular recognition,
and in particular to single molecule detection.Comment: 8pages, 3figure
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