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Materiais e técnicas para nanoestruturas magnetoelétricas compósitas
(Universidade Federal de Santa Maria, 2014-12-19)
Hybrid nanostructures which integrate two or more technologically interesting physical properties are
fundamental for developing new generations of electronic devices. Exhibiting at least two coupled ferroic orders,
multiferroics ...
Estudo de primeiros princípios da estabilidade e funcionalização da superfície e nanofitas de carbeto de silício
(Universidade Federal de Santa Maria, 2014-10-24)
We use first principles calculations based upon the density functional theory to
investigate the stability, geometry, electronic and magnetic properties of cibic silicon
carbide (SiC) surfaces aligned along the (001) ...
Estudo da anisotropia unidirecional e da histerese rotacional em sistemas com exchange bias
(Universidade Federal de Santa Maria, 2014-08-18)
The exchange bias (EB) phenomen occurs due to the coupling between ferromagnetic and
antiferromagnetic material and the main characteristics are the rise of unidirectional anisotropy
and the rotational hysteresis in torque ...
Simulação ab initio de nanotubos de carbono funcionalizados via adsorção e deformação estrutural
(Universidade Federal de Santa Maria, 2014-08-29)
In this thesis the behavior of functionalized carbon nanotubes via chemical and physical
adsorption and estrural deformation is studied through ab initio calculations based
on the DFT formalism, using the SIESTA program. ...
Cálculos de primeiros princípios em isolantes topológicos: HgTe/CdTe
(Universidade Federal de Santa Maria, 2014-12-15)
The observation of the quantum spin Hall effect in the HgTe/CdTe heterostructure triggered
the study of materials exhibiting a spin polarized electronic current at their surfaces/
interfaces. These states are topologically ...
Avaliação do "magnetron sputtering" como técnica para obtenção de MgB2
(Universidade Federal de Santa Maria, 2014-08-26)
In this work a survey of the potentialities and limitations of magnetron sputtering as a
tool for the production of MgB2 superconductors thin films has been made. Instead of the usual
approaches, like co-deposition onto ...
Estudo de impureza de európio em PbSe e PbTe. Uma investigação de primeiros princípios
(Universidade Federal de Santa Maria, 2014-01-30)
In this work properties were studied the structural, electronic and magnetic semiconductors
PbSe and PbTe doped with europium (Eu) in the crystalline phase. The
investigation is performed within the density functional ...
Caracterização de filmes finos magnéticos em altas frequências
(Universidade Federal de Santa Maria, 2014-08-29)
In order to determine the complex permeability of ferromagnetic samples in the GHz
range, measurement techniques with transmission lines are most appropriate. These techniques
use the modification of the scattering ...
Conjunto de testes de garantia de qualidade de um software para planejamento radioterápico
(Universidade Federal de Santa Maria, 2014-05-29)
Radiotherapy can be highlighted as one possible treatment of cancer. From this point of view, the planning system for radiotherapic treatment is crucial. In order to check the software for the computerized planning of the ...
Estudo computacional da condutividade térmica de nanofios de Si
(Universidade Federal de Santa Maria, 2014-05-15)
In this work the thermal conductivity κ of Si nanowires using molecular dynamics simulations is calculated using the Müller-Plathe method. We show that at 500 K, κ for crystaline Si is 121; 557 W/mK, while for nanowires, ...