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Berëzovskiy, Russia

Bazilevskii A.A.,NPO Spetzneftgas | Korzunin G.S.,RAS Institute of Metal Physics | Matvienko A.F.,ZAO NPO Spektr
Russian Journal of Nondestructive Testing | Year: 2013

An analysis of the results of the diagnostics of the pipe state in gas mains was performed based on the data of intrapipe magnetic nondestructive testing of gas mains in order to evaluate the danger of the detected flaws and verify the accomplishment of a regular (3-5 year) intrapipe inspection. © 2013 Pleiades Publishing, Ltd. Source


Yartseva N.S.,Russian Academy of Sciences | Yartsev S.V.,ZAO NPO Spektr | Demangeat C.,University of Strasbourg
Solid State Communications | Year: 2015

Effect of surface orientation of nonmagnetic bed material on magnetic properties of the peculiar magnetic adatoms groups (MAGs) is found by simulation. Here we present the results of periodic Anderson model calculations for MAGs on V. The MAGs are formed of the Fe adatoms arranged in triangles, ovals, or short chains and placed over V substrate with (001) or (110) surface orientation. It is shown that magnetism of the Fe-MAGs on V(001) surface can be totally suppressed by the V surroundings, whereas the V(110) surface orientation results in magnetization of the Fe-MAGs and onset of noncollinear atomic moments distribution. Noncollinearity strictly depends on symmetry of the Fe-MAG. © 2015 Elsevier Ltd. All rights reserved. Source


Yartseva N.S.,RAS Institute of Metal Physics | Yartsev S.V.,ZAO NPO Spektr | Demangeat C.,University of Strasbourg
Journal of Magnetism and Magnetic Materials | Year: 2014

Magnetic moments distribution in Fe3Crn superlattice series with fixed middle Fe monolayer and number of Cr monolayers (MLs) n from 1 to 45 is computed in the framework of collinear and noncollinear Periodic Anderson model. The superlattices are composed of layers in (0 0 1) and (1 1 0) plane with ideal interface. The total energy shows that noncollinear orientation of the magnetic moments remains the ground state for all superlattices with Cr thickness above 5 MLs. Distribution of the magnetic moments for Fe/Cr(0 0 1) superlattices depends on parity of the Cr MLs. For odd numbers Cr magnetic moments are canted and symmetrically distributed between the neighboring Fe slabs. The values of Cr moments are enhanced at the interface and weakened to the bulk in the middle. For even numbers of Cr MLs quasi-helicoidal magnetic moments distribution consisting of two interleaved spirals is found. The moments are screwing sequentially from Fe/Cr interface to perpendicular orientation, keeping the angles and moments for some successive MLs, and then continue screwing towards the next interface. In Fe/Cr(1 1 0) superlattices the magnetic moments of two nonequivalent atoms in the monolayer are canted to each other near Fe/Cr interface and then swing the direction on perpendicular to the fixed Fe moments. © 2014 Elsevier B.V. Source


Yartseva N.S.,RAS Institute of Metal Physics | Parlebas J.C.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Mokrani A.,Jean Rouxel Institute | Yartsev S.V.,ZAO NPO Spektr | Demangeat C.,University of Strasbourg
Solid State Communications | Year: 2011

The non-collinear magnetic moment distribution at the Cr/Fe(110) interface of an Fe(110) thin film covered by a Cr monolayer is revealed by means of periodic Anderson model calculations. It is shown that the Cr surface has two magnetically non-equivalent sites with magnetic moments canted to each other. The Fe atoms in the subsurface monolayer also acquire two magnetically non-equivalent sites with magnetic moments canted to each other. Non-collinearity is shown to be a ground state for the Cr/Fe(110) multilayer. © 2011 Elsevier Ltd. All rights reserved. Source


Yartseva N.S.,RAS Institute of Metal Physics | Yartsev S.V.,ZAO NPO Spektr | Parlebas J.-C.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Demangeat C.,University of Strasbourg
European Physical Journal B | Year: 2013

Formation of noncollinear distribution of the magnetic moments in Fe/Cr(001) and Fe/Cr(110) superlattices with ferromagnetic coupling of the Fe slabs having abrupt interfaces are considered in noncollinear Anderson model approach. Self-consistent calculations for variable Cr spacer thickness from 1 to 9 monolayers are carried out using a total-energy minimization for arbitrary orientations of the Fe and Cr magnetic moments in a given plane. It is found that the Fe/Cr(001) superlattices with Cr spacer from 6 to 9 monolayers decrease their total energy for a quasi-helicoidal distribution of the magnetic moments which consists in two interleaved spirals. Magnetic moments distribution in the Fe/Cr(110) superlattices decrease their total energy for noncollinear ordering in the Cr spacer with number of monolayers from 5 to 9. The moments of atoms at the interfacial Cr layers are canted to each other with the values reduced to 0.15-0.17 μ B, whereas the Cr moments in the intermediate monolayers drastically reduce their values to 0.04-0.06 μ B having an opposite orientation of the moments with a polarization plane perpendicular to the Fe slabs. © 2013 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source

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