Blatter, Gastn (2023) Efecto de la proximidad con metales no magnticos y materiales ferromagnticos en la inestabilidad de Larkin-Ovchinnikov en sistemas superconductores desordenados / Effect of proximity to non-magnetic metals and ferromagnetic materials on the Larkin-Ovchinnikov instability in disordered superconductor systems. Maestra en Ciencias Fsicas, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en espaol
Conocer las velocidades lmites alcanzables por los vrtices superconductores en la disipacin es de utilidad por varias razones. Primero, es til para realizar una medici n indirecta del tiempo de relajacin de cuasipartculas, parmetro necesario para el diseo y fabricacin de detectores de fotones nicos basados en nanoalambres superconductores (SNSPD). Cuanto mayor sea la velocidad alcanzada por los vrtices, ms pequeo es dicho tiempo y por lo tanto mayor resolucin puede tener un detector. A su vez, es interesante dado que cuando las velocidades alcanzadas son de caracter supersnico, aparece nueva fsica emergente asociada a radiacin Cherenkov y ondas de espn en hbridos superconductor/ferromagneto. Se conoce que hay diversos factores que impactan en las velocidades alcanzables. Por mencionar algunos, se tiene el efecto de la rugosidad de las lminas superconductoras y los efectos de proximidad con capas magnticas. Esto motiv la fabricacin de bicapas superconductor/ferromagneto, y bicapas superconductor/metal no magntico para investigar en mayor detalle estos efectos. Como material superconductor se escogi el nitruro de molibdeno (Mo2N), que se caracteriza por su posibilidad de ser crecido a temperatura ambiente y amorfo, con una temperatura crtica de hasta 8 K. Como materiales magnticos se seleccionaron FePt, Co y Fe_20Ni_80. El criterio seguido fue la diversidad en la estructura de dominios de estos sistemas. En cuanto a los materiales metlicos, se utilizaron Al, W y Pt, con un criterio basado en tener diferentes conductividades elctricas/trmicas. Las bicapas fueron fabricadas mediante la tcnica de sputtering, y posteriormente caracterizadas mediante las tcnicas DRX, AFM, MFM, magnetometra SQUID y transporte elctrico. Se construyeron microcircuitos sobre las muestras utilizando las tcnicas de litografa ptica y comido inico. Los resultados obtenidos muestran en primer lugar que para todas las bicapas, las velocidades alcanzadas son mayores que para una monocapa de Mo_2N. En el caso de las bicapas superconductor/metal no magntico, esto se asoci a la capacidad de las muestras en transportar calor, disminuyendo as el efecto de los calentamientos locales que pueden ser destructivos para la dinmica de vrtices. En el caso de las bicapas superconductor/ ferromagneto, se observaron incrementos aun mayores, asociados a efectos de proximidad magnticos. Se observ adems que cuando el sistema magntico tiene una estructura de dominios en forma de stripes, los incrementos de velocidad estn prexi sentes nicamente si los mismos estn alineados con el flujo de vrtices. De lo contario, se encontr una cada drstica de velocidades, para bajos valores de campo magntico. Para campos magnticos moderados y altos, las velocidades medidas son iguales a las del resto de las bicapas superconductor/ferromagneto.
Resumen en ingls
Knowing the critical velocity reachable by superconducting vortices in the flux-flow state is valuable for several reasons. First, it is useful to perform an indirect measurement of the quasiparticle relaxation time, a necessary parameter for the design and construction of Superconducting Nanowire Single Photon Detectors (SNSPD). As the critical velocity increases, this time is reduced, resulting in improved detector resolution. Additionally, it is interesting because new physics emerges when vortex velocities become supersonic, including Cherenkov radiation and spin waves in superconductor/ ferromagnetic hybrids. There are various factors known to influence achievable velocities. Notably, the roughness of superconducting films and the proximity effects with magnetic layers play crucial roles. This led to the production of superconductor/ferromagnetic and superconductor/non-magnetic metal bilayers to delve deeper into these effects. Molybdenum nitride (Mo2N) was chosen as the superconducting material due to its ability to be grown at room temperature in an amorphous state, boasting a critical temperature of up to 8 K. Magnetic materials such as FePt, Co, and Fe_20Ni_80 were selected based on the diversity of their magnetic domain structures. In the realm of metallic materials, Al, W, and Pt were chosen for their distinct thermal and electrical conductivities. The bilayers were fabricated using the sputtering technique and subsequently characterized through X-ray diffraction (XRD), atomic force microscopy (AFM), magnetic force microscopy (MFM), SQUID magnetometry, and electrical transport measurements. Microcircuits were constructed on the samples using optical lithography and ion beam techniques. The results obtained indicate, firstly, that for all bilayers, velocities achieved surpass those of a monolayer of Mo_2N. In the case of superconductor/non-magnetic metal bilayers, this enhancement is attributed to the samples’ ability to efficiently transport heat, thereby mitigating the adverse effects of local heating that could be detrimental to vortex dynamics. Notably, in the superconductor/ferromagnetic bilayers, even greater velocity increases were observed, primarily attributed to magnetic proximity effects. It was further noted that when the magnetic system exhibits a domain structure in the form of stripes, velocity increments are evident only when these stripes align with the vortex flow. Conversely, a significant drop in velocities was observed for low values of the applied magnetic field when the stripes were misaligned. However, for moderate to high magnetic fields, the measured velocities aligned with those of the other superconductor/ferromagnetic bilayers.
| Tipo de objeto: | Tesis (Maestra en Ciencias Fsicas) |
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| Palabras Clave: | Superconductivity; Superconductividad; Ferromagnetism; Ferromagnetismo; Vortices; Metals; Metales; [Bilayers; Bicapas; Larkin Ovchinnikov] |
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| Materias: | Fsica > Materia condensada |
| Divisiones: | Gcia. de rea de Investigacin y aplicaciones no nucleares > Gcia. de Fsica > Materia condensada > Bajas temperaturas |
| Cdigo ID: | 1236 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 23 Abr 2024 14:35 |
| ltima Modificacin: | 23 Abr 2024 14:37 |
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