Barturen, Mariana (2014) Anisotropía magnética y acople magneto-elástico en películas delgadas de Fe_1-xGa_x crecidas epitaxialmente sobre ZnSe/GaAs(001). / Magnetic anisotropy and magneto-elastic coupling in Fe_1-xGa_x thin films grown epitaxially over ZnSe/GaAs(001). Tesis Doctoral en Física, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En la evolución de la investigación acerca de materiales magnetostrictivos, el descubrimiento de la aleación Fe_1-xGa_x fue un punto donde se alcanzó un compromiso muy conveniente entre los requerimientos de tener elevada magnetostricción a temperatura ambiente (del orden de 10"4), campos de manipulación bajos (menores a 300 Oe), hist éresis pequeña, gran ductilidad y bajo costo (por el hecho de no poseer tierras raras) [1]. Estas características inspiraron gran número de trabajos tanto teóricos como experimentales destinados a entender, entre otras cuestiones, la influencia de la estructura atómica en la magnetostricción. En esta tesis hemos introducido el estudio de esta aleación crecida como película delgada. Las facilidades del Instituto de Nanociencia de París nos permitieron contar con films crecidos por MBE de espesores nanométricos y monocristalinos. Nuestro trabajo fue de índole experimental y consistió en realizar una caracterizaci ón magnética que incluyó el estudio de las anisotropías magnéticas, los coeficientes de acople-magneto-elástico y los dominios magnéticos. Para este trabajo se utilizaron principalmente las técnicas de resonancia ferromagnética, medición del acople magnetoel ástico por deflexión de cantilever y microscopía de fuerza magnética. Las anisotropías se estudiaron en función del espesor, concentración y estructura atómica lográndose una extensiva descripción del sistema. Se observó que los films conservan muchas de las características del material masivo pero al mismo tiempo presentan otras que los hacen diferentes. En particular, se detectó la presencia de una fuerte anisotropía fuera del plano (del orden de diez veces mayor a la anisotropía dentro del plano) que tiene una contribución magnetocristalina, una magneto-elástica y otra de origen desconocido para la cual presentamos la propuesta de una anisotropía en la distribución de los pares de Ga (más pares de Ga fuera del plano que dentro del mismo). Esta última contribución pudo ser modelada proponiendo una adaptación del modelo fenomenológico de Cullen [2]. Como consecuencia de esta anisotropía fuera del plano aparecen, para espesores adecuados, dominios magnéticos en forma de tiras o stripes cuya presencia no había sido detectada antes de esta tesis. Estos dominios pueden rotar en la dirección del campo magnético de saturación aplicado.
Resumen en inglés
In the evolution of research concerning magnetostrictive materials, the discovery of the Fe_1-xGa_x alloy was a point where a very suitable compromise was reached between the requirements of having an elevated magnetostriction at a room temperature (in the order of 10"4), low manipulation fields (lower than 300 Oe), small hysteresis, great ductility and low cost (due to the fact of not possessing rare earths) [1]. These characteristics inspired a great amount of publications, both theoretical and experimental destined to understand, among other issues, the influence of the atomic structure in magnetostriction. In this thesis we have introduced the study of this alloy grown as thin film. The facilities of Institute of Nanoscience of Paris allowed us to count on monocrystalline films of nanometric thicknesses grown by MBE. Our work was of experimental nature and consisted in a magnetic characterization that included the study of magnetic anisotropies, magneto-elastic coupling coefficients and magnetic domains. For this work we principally used three techniques: ferromagnetic resonance, magnetoelastic coupling measurement by cantilever deffection and magnetic force microscopy. Anisotropies were studied as a function of thickness, concentration and atomic structure, achieving an extensive description of the system. It was observed that the films conserved many of the bulk material characteristics, but at the same time they present some singularities that make them diffeerent. Particularly, a strong out of plane anisotropy was detected (ten times larger than the in-plane anisotropy), which has a magnetocrystalline contribution, a magnetoelastic contribution and another one of unknown origin. To explain this last term we put forward the hypothesis of an anisotropic distribution of Ga pairs (more Ga pairs out of plane than in plane). This last contribution could be modeled by adapting Cullen's phenomenological model [2]. As a consequence of this out of plane anisotropy, magnetic domains with stripe pattern appear, for appropriate thicknesses. This configuration was detected for the first time during this thesis in this system. These domains can rotate in the direction of the saturation applied magnetic field.
| Tipo de objeto: | Tesis (Tesis Doctoral en Física) |
|---|---|
| Información Adicional: | Área Temática: Magnetismo en películas delgadas. |
| Palabras Clave: | Magnetostriction; Magnestricción; Anisotropy; Anisotropía; [Galfenol; Fega; Stripes; Magneto-elastic coupling; Acople magneto-elástico] |
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| Materias: | Física |
| Divisiones: | Gcia. de área de Investigación y aplicaciones no nucleares > Gcia. de Física > Ciencias de materiales > Resonancias magnéticas |
| Código ID: | 612 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 14 Jun 2017 11:55 |
| Última Modificación: | 14 Jun 2017 11:55 |
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