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Películas magnéticas delgadas con anisotropía perpendicular: fabricación y estudio de paredes de dominios / Magnetic thin films with perpendicular anisotropy: fabrication and study of domain walls

Cortés Burgos, María J. (2022) Películas magnéticas delgadas con anisotropía perpendicular: fabricación y estudio de paredes de dominios / Magnetic thin films with perpendicular anisotropy: fabrication and study of domain walls. Tesis Doctoral en Física, Universidad Nacional de Cuyo, Instituto Balseiro.

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Resumen en español

La anisotropía magnética perpendicular (PMA) dominante es una característica que se presenta en películas delgadas o sistemas multicapa magnéticos, y resulta de gran interés para una amplia variedad de aplicaciones en el área del almacenamiento de información debido a su amplio potencial para el diseño y fabricación de dispositivos espintrónicos de nueva generación. Hoy en día, éstos representan una promesa para el desarrollo de memorias magnéticas de alta velocidad de conmutación y baja energía de procesamiento. Las paredes de dominios (DWs) magnéticas, es decir, la zona de transición entre dos dominios magnéticos, y particularmente su dinámica, han sido de continuo estudio debido a su rol fundamental en la comprensión de los mecanismos de inversión de la magnetización. La comprensión y cuantificación de distintos parámetros asociados a la naturaleza de esta dinámica, como la velocidad de propagación y rugosidad de DWs, es crucial para definir el potencial de un material en el desarrollo de dispositivos espintrónicos. En este trabajo, se presenta un estudio detallado de la optimización de parámetros de fabricación de sistemas magnéticos a base de películas delgadas tanto de metales como de óxidos magnéticos mediante el método de sputtering DC, apuntando a inducir una PMA dominante en muestras de Pt/Co/Pt y La_0.75Sr_0.25MnO_3 (LSMO). Optimizando la fabricación de muestras, se logró tener un buen control en la reproducibilidad de películas de Pt/Co(< 1 nm)/Pt con PMA dominante. Por otro lado, si bien no se logró fabricar películas de LSMO con PMA dominante, controlando la anisotropía magnética inducida por tensiones en la interfaz película/substrato, se ha logrado obtener muestras que exhiben alguna componente de PMA. Se ha llevado a cabo un estudio sistemático de la dinámica de propagación y de la rugosidad de DWs magnéticas desplazadas con campo magnético en el régimen de creep a temperatura ambiente en películas de Pt/Co/Pt con PMA dominante mediante microscopia de Efecto Kerr Magneto-Óptico polar. Para realizar un análisis estadístico de las DWs observadas, se parametrizó cada interfaz con una función 𝑢(𝑥). La influencia del campo en la rugosidad de las DWs se estudió mediante la función de correlación de fluctuaciones 𝐵(𝑟)=〈[𝑢(𝑥+𝑟)−𝑢(𝑥)]"2〉 de un conjunto de interfaces 𝑢(𝑥), obtenidas bajo las mismas condiciones experimentales. Del comportamiento tipo ley de potencias de la función de correlación 𝐵(𝑟)=𝐵0𝑟"2𝜁, se obtuvieron para cada campo 𝐻, el exponente de rugosidad 𝜁 y la amplitud 𝐵_0. Se observó que el exponente de rugosidad es independiente de 𝐻, mientras que, por otro lado, la amplitud de rugosidad depende considerablemente del campo, tal que disminuye al aumentar la intensidad de 𝐻. A partir de los resultados experimentales, se propone una interpretación teórica de los mismos mediante la existencia de un crossover de regímenes, tal que el exponente de rugosidad se puede definir como un exponente efectivo, descrito por los exponentes de rugosidad de los regímenes de depinning y térmico, los cuales están asociados a distintas escalas de longitud.

Resumen en inglés

Perpendicular magnetic anisotropy (PMA) can be observed in magnetic thin films or magnetic multilayered systems. Materials presenting PMA are of great interest for a wide variety of applications in the area of information storage, due to its potential for design and fabrication of new generation spintronic devices. Nowadays, such devices are regarded as promising for the development of magnetic memories with high switching speed and low processing power consumption. Magnetic domain walls (DWs), that is, the transition region between two magnetic domains, have been continuously studied due to their fundamental role in magnetization inversion processes. Of particular interest is the dynamics of DWs driven by external stimuli. The understanding and quantification of different parameters associated with the nature of this dynamics, such as the propagation velocity and the roughness of DWs, is crucial to evaluate the potential of a material in the development of spintronics devices. In this work, we present a detailed study of the optimization of manufacturing parameters using the DC sputtering method of two type of thin magnetic systems based on magnetic metals and oxides. The goal was to induce a dominant PMA in Pt/Co/ Pt and La_0.75Sr_0.25MnO_3 (LSMO) systems. By optimizing the fabrication process, it was possible to have a good control in the reproducibility of Pt/Co(< 1 nm)/Pt films with dominant PMA. On the other hand, although we did not succeed in obtaining LSMO films with dominant PMA, by controlling the magnetic anisotropy induced by stresses at the film/substrate interface, it was possible to obtain samples that exhibit a PMA component. A systematic study of the propagation dynamics and the roughness of magnetic DWs, displaced by magnetic fields in the creep regime at room temperature was carried out using polar Magneto-Optical Kerr Effect microscopy. For this study, Pt/Co/Pt films with dominant PMA were used. To perform a statistical analysis of the observed DWs, each interface was parameterized with a function 𝑢(𝑥). The influence of the magnetic field on the roughness of the DWs was studied using the fluctuation correlation function 𝐵(𝑟)=〈[𝑢(𝑥+𝑟)−𝑢(𝑥)]"2〉 of a set of interfaces 𝑢(𝑥), obtained under the same experimental conditions. From the power-law behavior of the correlation function, 𝐵(𝑟)=𝐵0𝑟"2𝜁, the roughness exponent 𝜁 and the amplitude 𝐵_0 were obtained for each field 𝐻. It was observed that the roughness exponent is independent of 𝐻, while, on the other hand, the roughness amplitude considerably depends on the field, such that it decreases with increasing intensity of 𝐻. A theoretical interpretation of the experimental results is proposed by considering the existence of crossover length scales, such that the observed roughness exponent can be defined as an effective exponent, depending on the roughness exponents theoretically predicted for the depinning and thermal regimes.

Tipo de objeto:	Tesis (Tesis Doctoral en Física)
Palabras Clave:	Anisotrypy; Anisotropía; Thin films; Capas finas; [Magnetic thin films; Películas magnéticas delgadas; Perpendicular magnetic anisotropy; Anisotropía perpendicular ; Magnetic domain walls; Paredes de dominios magnéticas ; Dinamic of interfaces; Dinámica de interface]
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Materias:	Ingeniería > Ciencia de los materiales
Divisiones:	Gcia. de área de Investigación y aplicaciones no nucleares > Gcia. de Física > Ciencias de materiales > Resonancias magnéticas
Código ID:	1095
Depositado Por:	Tamara Cárcamo
Depositado En:	17 Aug 2022 15:30
Última Modificación:	17 Aug 2022 15:30

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