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Estudo sistematico das propriedades termodinâmicas e criticalidade de filmes finos e super-redes magnéticas.
(Universidade Federal de São Carlos, 2004-12-10)
In this work we will study through the differential operator technique the surface
effect in anisotropic spin ½ quantum Heisenberg model, through theory of effective field
(EFT), of a two-spins cluster, in case of simple ...
Dispersão dielétrica em materiais ferroelétricos.
(Universidade Federal de São Carlos, 2004-12-13)
In the last decades, the high frequency dielectric response has been one of
the most studied issues in the ferroelectricity area. The main dielectric
characteristic is the strong dependence of the dielectric parameters ...
Magnetorresistência túnel ressonante e acoplamento magnético em heteroestruturas epitaxiais.
(Universidade Federal de São Carlos, 2004-10-29)
In the context of spin electronics, this doctorate thesis presents an
experimental study of spin polarized transport in epitaxial heterostructures as planar
magnetic tunnel junctions formed by semiconductors and metallic ...
Espectroscopia Mössbauer aplicada ao estudo da liga aço baixo carbono-Al nitretada.
(Universidade Federal de São Carlos, 2005-03-18)
We presented in this work a study of the influence of the thickness of Al thin film
deposited in substratum of low carbon steel. Alloys of steel low carbon and
aluminum are used broadly in automobile and aerospace industries. ...
Estrutura dos diagramas de fases de um modelo de filmes finos via métodos de Monte Carlo
(Universidade Federal de São Carlos, 2010-12-17)
Multilayer systems consisting of magnetic layers of heterostructures can have a variety of magnetic phases - those dependent on factors such as the exchange parameters, the geometry of the material, the temperature T to ...
Caracterização magnética do compósito multiferróico (1-x)Pb(Mg1/3Nb2/3)-xPbTiO3/NiFe2O4
(Universidade Federal de São Carlos, 2010-03-22)
In this work we studied the magnetic properties of nickel ferrite and the (1-x)Pb(Mg1/3Nb2/3)-xPbTiO3/NiFe2O4 (PMN-PT/NFO) multifferroic composite syntherized in different temperatures. The magnetization, magnetostriction ...
Monitoramento de propriedades de condensados de Bose-Einstein interagindo não ressonantemente com campos óticos via detecção contínua de fotóns
(Universidade Federal de São Carlos, 2006-03-13)
In this work we consider an of - resonant interaction between optical fields and a Bose - Einstein condensation. We used a continuous photo detection model to study the efects of the counting of k photons of the optical ...
Propriedades estáticas e dinâmicas de portadores em heteroestruturas semicondutoras.
(Universidade Federal de São Carlos, 2002-10-30)
We have studied the dynamic and the stationary properties of carriers in semiconductor
heterostructures submitted to electric fields AC and DC and to magnetic fields
within the effective-mass approximation based on ...
Estudo do efeito da correlação do alvo no espalhamento de elétrons por moléculas pequenas na faixa de energias baixas e intermediária.
(Universidade Federal de São Carlos, 2004-03-26)
In this present work, we have carried out a theoretical investigation on the
influence of the target electronic correlation on electron elastic scattering by molecules.
Calculated differential, integral and momentum-transfer ...
Processos de relaxação em sistemas quânticos e álgebra de operadores não-lineares
(Universidade Federal de São Carlos, 2006-02-24)
On this thesis some aspects of relaxation processes and decoherence processes using deformed
algebras of the harmonic oscillator, particularly the generalized deformed algebra (GDA algebra)
and Kerr algebra were studied.Two ...