Thermomagnetic history effects across the first order magneto-structural transition in the giant magnetocaloric Fe-Rh alloy |
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Authors: | M Manekar S B Roy |
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Institution: | (1) Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504 CNRS -ULP), BP 43, 23 rue du Loess, 67034 Strasbourg Cedex 2, France |
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Abstract: | We investigate the electronic structure of
Sr2FeMoO6/SrTiO3 (SFMO/STO) multilayers using the
ab initio Full Potential Linearized Augmented Plane Wave
method in order to study their properties within the GGA and GGA+U methods. We examin more especially the role of the interface
on the magnetic and transport properties of these multilayers taking into account a possible Fe deficiency at the interface
and we show that bulk behaviour is rapidly recovered due to the strong localization of
the interfacial perturbation. For perfect interfaces, the whole structure is found half-metallic within the GGA+U method;
the situation
being ambiguous within the GGA method where SFMO is at the limit of being half-metallic depending on the structural deformation
induced by the STO layer. This leads us to the conclusion that such a system could be used as injection electrode and tunnel
barrier in magnetic tunnel junctions with a fully spin polarized injected current.
For Fe deficient interfaces, we show that the interfacial densities of states are nearly unpolarized showing that this kind
of
imperfection has potentially a strong impact on the properties
of the multilayers. |
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Keywords: | 71 20 -b Electron density of states and band structure of crystalline solids 71 55 Ak Metals semimetals and alloys 75 47 -m Magnetotransport phenomena materials for magnetotransport |
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