Ramírez Chamorro, Gerardo A. (2020) Crecimiento y caracterización de películas delgadas de la aleación magnetostrictiva Fe_1-xGa_x: correlación entre la textura cristalina y sus propiedades magnéticas / Growth and characterization of then films of the Fe_1-xGa_x magnetostrictive alloy: correlation between cristalline texture and its magnetic properties. Tesis Doctoral en Física, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
La optimización de los dispositivos electrónicos es una de las mayores premisas de la industria tecnológica, apuntando por un lado al aumento de las velocidades de almacenamiento y por otro a una disminución de los consumos de energía. Recientemente se ha prestado especial interés a los dispositivos espintrónicos en los cuales es posible controlar de manera simultánea la carga y el espín de los electrones. Debido a la miniaturización, la aplicación de campos externos para modificar el estado de la magnetización no es posible. Por lo tanto, es necesaria la utilización de métodos alternativos. Uno de ellos es aprovechar el acople magneto-elástico. Para poder emplear este método necesitamos materiales con alta constante de magnetostricción. Un material muy prometedor es la aleación hierro-galio Fe_1-xGa_x (Galfenol) debido a su alta magnetostricción (~ 400 ppm), gran ductilidad, alta temperatura de Curie, bajo campo de saturación, baja coercitividad y modesto costo en relación a aleaciones magnetostrictivas en base a tierras raras como terfenol-D (Tb_xDy_1-xFe_2). Las propiedades magneticas de las aleaciones de Fe-Ga en películas delgadas dependen fuertemente de la microestructura y en particular de la textura cristalográfica inducida durante el proceso de crecimiento. Puede ser influenciada por distintos parámetros como: tiempo de depósito, presión de argón, tipo y temperatura de sustrato, distancia blanco-sustrato, potencia de bombardeo o tratamientos térmicos post-crecimiento. De manera muy especial, la razón de concentraciones en la aleación afecta de manera significativa la estructura del material y modifica radicalmente su comportamiento magnetostrictivo. En este trabajo se fabricaron diferentes series de películas delgadas de la aleación Fe_1-xGa_x en diferentes condiciones de crecimiento y se estudió el comportamiento magnetostrictivo de las muestras con distintas técnicas que nos entregan información de la composición química, estructura y comportamiento magnético. Primero se realizó un estudio de las muestras fabricadas mediante la técnica de pulverizaci ón catódica, analizando efectos de tipo de sustrato y temperatura de recocido, buscando la formación de distintos tipos de textura cristalográfica en el material que afectan sus propiedades magnéticas. Ampliando el estudio del comportamiento magnético de la aleación se estudió la influencia de la presión de pulverización, nuevamente a partir de detallados estudios de textura cristalográfica y tensiones residuales, donde a partir de modelos energéticos se pudieron predecir satisfactoriamente los resultados experimentales de resonancia ferromagnética. Se prestó especial interés en el diseño y armado de un equipo para la medición de constantes magneto-elásticas para películas delgadas por la técnica de deflexión de cantilever que posibilitó realizar los estudios de muestras donde además de la variación de la concentración de galio se modificó el tipo y temperatura de sustrato. Una comprensi ón detallada de sus propiedades magneto-elásticas resulta imprecindible pensando en futuras aplicaciones en dispositivos donde la magnetostricción de los materiales se pueda modificar según las necesidades mediante el control de su microestructura a través de parámetros en el crecimiento.
Resumen en inglés
The optimization of electronic devices is one of the major premises of the technology industry, pointing one hand to increase storage speeds and on the other to a decrease in energy consumption. Recently, special attention has been given to spintronic devices in which it is possible to simultaneously control the charge and the spin of electrons. Due to miniaturization, the application of external fields to modify the state of magnetization is not possible. Therefore, the use of alternative methods is necessary. One of them is to use the magneto-elastic coupling. In order to use this method we need to use materials with high magnetostriction constant. A very promising material is the iron-gallium alloy Fe_1-xGa_x (Galfenol) due to its high magnetostriction (~ 400 ppm), ductility and Curie temperature, low coercivity and modest price with respect to magnetostrictive alloys based on rare earths such as terphenol-D (Tb_xDy_1-xFe_2). The magnetic properties of Fe-Ga alloys thin films depend strongly on the microstructure, and in particular on the crystallographic texture that is induced during the growth process and can be influenced by different parameters such as: deposition time, argon pressure, substrate type and temperature, target-substrate distance, sputtering power or annealing treatments. In a very special way, the composition rate in the alloy changes significantly the structure of the material and affects radically its magnetostrictive behavior. In this work, Fe_1-xGa_x thin films were grown under different growth conditions and the magnetostrictive behavior of the samples was studied, based on the information obtained from different techniques that give us information about the chemical composition, structure and magnetic behavior. Firstly, an exploration of the sputtered thin films properties was carried out, studying the effects of substrate type and annealing temperature, exploring the formation of different types of crystallographic texture in the material that affect their magnetic properties. Extending the study of the magnetic behavior of the alloy, the influence of argon pressure during the grown process was studied, again from detailed studies of crystallographic texture and residual stresses and the experimental results of ferromagnetic resonance could be satisfactorily predicted from magnetocrystalline energy models. Special interest was given in the design and assembly of a device for the measure ment of magnetoelastic coupling constants for thin films by the cantilever deflection technique, that allows the study of a sample where, in addition to the variation of the gallium concentration, we varied the type and temperature of the substrate. A deeper understanding of its magneto-elastic properties is essential when considering future applications in devices where the magnetostriction of the materials can be modified according to the needs by controlling its microstructure through growth parameters.
| Tipo de objeto: | Tesis (Tesis Doctoral en Física) |
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| Palabras Clave: | Magnetostriction; Magnetoestricción; Residual stresses; Tensión residual; Ferromagnetic resonance; Resonancia ferromagnética; Thin films; Capas finas; [Magnetic anisotropies; Anisotropías magnéticas; Crystallographic texture; Textura cristalográfica] |
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| Materias: | Física > Magnetismo |
| Divisiones: | Gcia. de área de Investigación y aplicaciones no nucleares > Gcia. de Física > Ciencias de materiales > Resonancias magnéticas |
| Código ID: | 984 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 04 Oct 2021 16:02 |
| Última Modificación: | 07 Oct 2021 16:02 |
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