Fabrication and characterization of cobalt microbars

Magnetic materials have been widely used in applications such as data storage, magnetic tunnel junctions and spin valve structures. In the present work, we explore the magnetic properties of various millimeter size arrays of magnetic microbars. For this study, we focused on Cobalt microbars fabricat...

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Detalles Bibliográficos
Autor: Useche Reyes, Diego Hernando
Tipo de recurso: tesis de maestría
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:Colombia
Institución:Universidad de los Andes
Repositorio:Séneca: repositorio Uniandes
Idioma:inglés
OAI Identifier:oai:repositorio.uniandes.edu.co:1992/61530
Acceso en línea:http://hdl.handle.net/1992/61530
Access Level:acceso abierto
Palabra clave:Magnetismo
Materiales magnéticos
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spelling Fabrication and characterization of cobalt microbarsUseche Reyes, Diego HernandoMagnetismoMateriales magnéticosMagnetic materials have been widely used in applications such as data storage, magnetic tunnel junctions and spin valve structures. In the present work, we explore the magnetic properties of various millimeter size arrays of magnetic microbars. For this study, we focused on Cobalt microbars fabricated using photolithography, thermal evaporation, sputtering and electron gun techniques. Magnetization measurements as a function of angle were performed on microbars samples which dier slightly in their dimensions. The measurements were carried out using vibrating sample magnetometry (VSM). Also, computer simulations in OOMMF were done to simulate the experimental outcomes. As results, when the applied eld was parallel to the microbars the maximum coercivity was found and decreased slightly as the eld rotated towards the perpendicular direction. It was also found a sheared hysteresis loop in three of the samples.Los materiales magnéticos han sido ampliamente usados en aplicaciones como almacenamiento de datos, junturas túnel, y válvulas de spin. En este trabajo exploramos las propiedades magnéticas de varias muestras de microbarras de cobalto. Las microbarras magnéticas fueron fabricadas con los métodos de fotolitografía, evaporación térmica, sputtering, y cañón de electrones. Así mismo, realizamos mediciones de la magnetización de las muestras usando el VSM (vibrating sample magnetometer). Además, se realizaron simulaciones computacionales en OOMMF para explicar los resultados experimentales. Como resultados generales, cuando el campo magnético estaba paralelo a las barras se encontró máxima coercividad, y esta disminuía al rotar el campo en la dirección perpendicular. También, se encontraron unos pasos en los ciclos de histéresis para tres muestras cuando el campo es paralelo a las barras.--Tomado del Formato de Documento de Grado.Magíster en FísicaMaestríaUniversidad de los AndesMaestría en Ciencias - FísicaFacultad de CienciasDepartamento de FísicaPatiño Zapata, Edgar JavierColauto, FabianoRamírez Rojas, Juan Gabriel2017Trabajo de grado - Maestríainfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_bdcchttp://purl.org/coar/version/c_ab4af688f83e57aaTexthttp://purl.org/redcol/resource_type/TM60 hojasapplication/pdfapplication/pdfhttp://hdl.handle.net/1992/61530instname:Universidad de los Andesreponame:Repositorio Institucional Sénecarepourl:https://repositorio.uniandes.edu.co/795239-1001engAl consultar y hacer uso de este recurso, está aceptando las condiciones de uso establecidas por los autores.http://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2reponame:Séneca: repositorio Uniandesinstname:Universidad de los Andesinstacron:Universidad de los Andes2024-12-04T16:43:16Z
dc.title.none.fl_str_mv Fabrication and characterization of cobalt microbars
title Fabrication and characterization of cobalt microbars
spellingShingle Fabrication and characterization of cobalt microbars
Useche Reyes, Diego Hernando
Magnetismo
Materiales magnéticos
title_short Fabrication and characterization of cobalt microbars
title_full Fabrication and characterization of cobalt microbars
title_fullStr Fabrication and characterization of cobalt microbars
title_full_unstemmed Fabrication and characterization of cobalt microbars
title_sort Fabrication and characterization of cobalt microbars
dc.creator.none.fl_str_mv Useche Reyes, Diego Hernando
author Useche Reyes, Diego Hernando
author_facet Useche Reyes, Diego Hernando
author_role author
dc.contributor.none.fl_str_mv Patiño Zapata, Edgar Javier
Colauto, Fabiano
Ramírez Rojas, Juan Gabriel
dc.subject.none.fl_str_mv Magnetismo
Materiales magnéticos
topic Magnetismo
Materiales magnéticos
description Magnetic materials have been widely used in applications such as data storage, magnetic tunnel junctions and spin valve structures. In the present work, we explore the magnetic properties of various millimeter size arrays of magnetic microbars. For this study, we focused on Cobalt microbars fabricated using photolithography, thermal evaporation, sputtering and electron gun techniques. Magnetization measurements as a function of angle were performed on microbars samples which dier slightly in their dimensions. The measurements were carried out using vibrating sample magnetometry (VSM). Also, computer simulations in OOMMF were done to simulate the experimental outcomes. As results, when the applied eld was parallel to the microbars the maximum coercivity was found and decreased slightly as the eld rotated towards the perpendicular direction. It was also found a sheared hysteresis loop in three of the samples.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv Trabajo de grado - Maestría
info:eu-repo/semantics/masterThesis
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dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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dc.format.none.fl_str_mv 60 hojas
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dc.publisher.none.fl_str_mv Universidad de los Andes
Maestría en Ciencias - Física
Facultad de Ciencias
Departamento de Física
publisher.none.fl_str_mv Universidad de los Andes
Maestría en Ciencias - Física
Facultad de Ciencias
Departamento de Física
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