Efeitos de deformações controladas em fitas amorfas magnetostrictivas estudados por Espectroscopia Mössbauer do 57Fe
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Data
2011-09-30
Autores
Loyola, Gustavo Viali
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Universidade Federal do Espírito Santo
Resumo
In this work, we have study the effect of magnetization reorientation induced by stress (curvature) in , Al x/ Metglas, bilayers, where is the Fe78B13Si9 magnetostrictive amorphous ribbon (Metglas 2605S2), is the material deposited layer and its thickness (~microns). Additionally we estimated the ribbon anisotropies, out-of-plane, from the Mössbauer experiments as a function of the applied magnetic field in Ni x/ FINEMET/Ni x , trilayers, where is the Fe73.5Cu1Nb3Si13.5B9 magnetostrictive amorphous ribbon, is the material deposited layer. We induced stress by coupling of different materials and we study the effect of the magnetic reorientation by Mössbauer spectroscopy, since the relative absorption line intensities of a magnetic phase, measured by Mössbauer spectroscopy, mainly depend on the angle between incident gamma rays and the sample magnetization directions. We held Mössbauer measurements with the gamma rays direction has been set perpendicular to the ribbons planes; consequently we obtained information the average distribution of magnetization in the ribbons. The main results we conclude that: there is a line stress null which moves according to the curvature result in making non-zero mean stress; the magnetic reorientation occurs mainly due curvature effect; 95% of the fraction with perpendicular anisotropy to FINEMET magnetostrictive amorphous ribbon has values from 0 to 3kJ m 3 ; about 5% anisotropies has more than 12kJ m 3 associated with defects and irregularities from de production process; perpendicular bulk increased substantially due to stress-induced deposited of Ni layer.
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Magnetic Materials , Condensed Matter , Materiais Magnéticos , Matéria Condensada
Citação
LOYOLA, Gustavo Viali. Efeitos de deformações controladas em fitas amorfas magnetostrictivas estudados por Espectroscopia Mössbauer do 57Fe. 2011. 98 f. Dissertação (Mestrado em Física) – Programa de Pós-Graduação em Física, Universidade Federal do Espírito Santo, Centro de Ciências Exatas e da Terra, Vitória, 2015.