37 research outputs found
Domain wall effects in ferromagnet-superconductor structures
We investigate how domain structure of the ferromagnet in
superconductor-ferromagnet heterostructures may change their transport
properties. We calculate the distribution of current in the superconductor
induced by magnetic field of Bloch domain walls, find the ``lower critical''
magnetization of the ferromagnet that provides vortices in the superconductor
Critical temperature of superconductor/ferromagnet bilayers
Superconductor/ferromagnet bilayers are known to exhibit nontrivial
dependence of the critical temperature T_c on the thickness d_f of the
ferromagnetic layer. We develop a general method for investigation of T_c as a
function of the bilayer's parameters. It is shown that interference of
quasiparticles makes T_c(d_f) a nonmonotonic function. The results are in good
agreement with experiment. Our method also applies to multilayered structures.Comment: 4 pages, 2 EPS figures; the style file jetpl.cls is included. Version
2: typos correcte
Proximity effects in superconductor-ferromagnet heterostructures
The very special characteristic of the proximity effect in
superconductor-ferromagnet systems is the damped oscillatory behavior of the
Cooper pair wave function in a ferromagnet. In some sense, this is analogous to
the inhomogeneous superconductivity, predicted long time ago by Larkin and
Ovchinnikov (1964), and Fulde and Ferrell (1964), and constantly searched since
that. After the qualitative analysis of the peculiarities of the proximity
effect in the presence of the exchange field, the author provides a unified
description of the properties of the superconductor-ferromagnet
heterostructures. Special attention is paid to the striking non-monotonous
dependance of the critical temperature of the multilayers and bilayers on the
ferromagnetic layer thickness and conditions of the realization of the "Pi"-
Josephson junctions. The recent progress in the preparation of the high quality
hybrid systems permitted to observe on experiments many interesting effects,
which are also discussed in the article. Finally, the author analyzes the
phenomenon of the domain-wall superconductivity and the influence of
superconductivity on the magnetic structure in superconductor-ferromagnet
bilayers.Comment: Submitted to Reviews of Modern Physic
Erratum: Nonmonotonic behavior of the superconducting transition temperature in bimetallic ferromagnet-superconductor structures [JETP 86, 930–942 (May 1998)]
Multicritical behavior of the phase diagrams of ferromagnet/superconductor layered structures
Theory of magnetic-breakdown oscillations of the galvanomagnetic properties of aluminum taking account of the spin of the conduction electrons
Borderline papillary serous tumor of the ovary: the authors’ observation and a concise review of literature
The paper presents a case of borderline papillary serous cystadenoma in a 34-year-old female patient, by describing the magnetic resonance image of borderline ovarian tumors in detail and reviewing the data available in the literature on the specific features of their imaging and diagnosis