Magnetoelastic Interaction
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Efeito magnetocalórico em sistemas ferrimagnéticos / Magnetocaloric effect in ferrimagnetic systems
Nesta tese, o efeito magnetocalórico é estudado teoricamente partindo de um hamiltoniano modelo que leva em conta uma rede magnética formada por diversas sub-redes magnéticas acopladas. No hamiltoniano são consideradas as interações de troca, Zeeman e magnetoelástica. Primeiramente, o hamiltoniano é apresentado em sua forma generalizada para R sub-r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/09/2011
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2. Anisotropias magnéticas em filmes finos de Co: Uma análise por magnetometria de torque / Magnetic anisotropies in Co thin films:An analysis by torque magnetometry
By studying the magnetic behavior of materials a very important parameter to be analyzed are the constants of anisotropy. They can be associated with an effective anisotropy energy or to a more specific one as, for example, the magnetocrystalline. During the thin films deposition by magnetron sputtering, an uniaxial effective anisotropy can be induced due to
Publicado em: 2010
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3. Magnetic and barocaloric effect in physical systems with two energy levels / Efeitos magnetocalórico e barocalórico em sistemas físicos com dois níveis de energia
In this work we study the theoretical aspects of the magnetocaloric and barocaloric effect in simple physical systems with two and four energy levels. In order to do that, we used a Hamiltonian that consider local magnetic moments interacting among them and with an external magnetic field.We include in the Hamiltonian the magnetoelastic interaction, and an e
Publicado em: 2008
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4. The study of the magnetocaloric effect in compounds of MnAs1-xAx, A = P, Sb, Te e Mn1-xFexAs / Estudo do efeito magnetocalorico em compostos de MnAs1-xAx, A = P, Sb, Te e Mn1-xFexAs
In this work we describe the obtaining processes of the MnAs1-x Ax (A= Te, P, Sb) and Mn1-xFexAs series for several concentrations. We divided this work in two stages: in the first one the samples were obtained using a high pressure furnace and in the second one using a resistive furnaces with the samples sealed in quartz tubes. The first stage, can be split
Publicado em: 2006