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Previous issue date: 2015-09-10 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Multicamadas magn?ticas t?m uma grande import?ncia no desenvolvimento de elementos sensores baseados no efeito magnetoimped?ncia (MI). O advento de dispositivos usando substrato flex?vel org?nico t?m aberto novas fronteiras para o desenvolvimento da tecnologia nas mais diversas ?reas. Diante disso torna-se necess?rio a produ??o e estudo das propriedades magn?ticas e mec?nicas em filmes ferromagn?ticos crescidos em substrato flex?vel. Neste trabalho, foram produzidas multicamadas ferromagn?ticas de Py, Co e FeCuNbSiB em substratos flex?vel e r?gido, utilizando a t?cnica de magnetron sputtering. Na ocasi?o utilizou-se de uma metodologia para caracterizar as propriedades estruturais, magn?ticas e mec?nicas. Para isso foram utilizados os seguentes instrumentos de medida: difrat?metro de Raios-X, magnet?metro de amostra vibrante, analisador de imped?ncia, instrumentos de medida de dimens?es e software de elementos finitos. Atrav?s de uma an?lise meticulosa, foi poss?vel observar e correlacionar o comportamento do efeito MI com as propriedades magn?ticas quase-est?ticas, estruturais e mec?nicas. Observando-se uma forte depend?ncia da MI com a magnetostric??o de satura??o, quando s?o introduzidas anisotropias magnetoel?sticas, atrav?s de tens?es mec?nicas. As propriedades magn?ticas das multicamadas de Py mostram-se insens?veis as tens?es aplicadas. J?, nas multicamadas ferromagn?ticas de Co, teve como principal resultado, um aumento da dispers?o de MI atrelado ? eleva??o das tens?es mec?nicas. No caso, das multicamadas de FeCuNbSiB, a invers?o do eixo de anisotropia ? o resultado mais interessante, provocando modifica??es na configura??o do efeito MI, trazendo informa??es muito ricas da din?mica da magnetiza??o, quando tens?es mec?nicas s?o aplicadas ao sistema. / Magnetic multilayers have a considerable importance in the development of sensor elements
based on magnetoimped?ncia effect (MI). The advent of devices, using organic flexible substrate
have opened new frontiers for development of technology in several areas. Therefore it is
necessary the production and study of the magnetic and mechanical properties in ferromagnetic
films grown on flexible substrate. In this work, were produced ferromagnetic multilayer Py, Co
and FeCuNbSiB in flexible and rigid substrates, using the magnetron sputtering technique. In
the occasion, was used a methodology for characterizing the structural, mechanical and magnetic
properties. For this, the following measuring instruments were used: X-ray diffractometer,
vibrating sample magnetometer, impedance analyzer, dimensional measuring instruments and
finite element software. Through a meticulous analysis, we observed and correlate the MI effect
behavior, with the magnetic quasi-static, structural and mechanical properties. Observing
a strong dependence of MI with magnetostrictive saturation, when magnetoel?sticas anisotropy
introduced by mechanical stresses. The magnetic properties of the ferromagnetic multilayers
of Py shown to be insensitive to mechanical stresses applied. Already, the ferromagnetic multilayers
Co, it was mainly a result, an increase in dispersion of MI linked to the increase in
mechanical stress. In the case, of the ferromagnetic multilayers of FeCuNbSiB, the inversion of
the anisotropy axis it is the most interesting result, by causing changes in the MI effect, bringing
very rich information on the dynamics of magnetization when mechanical stresses are applied
to the system.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20578 |
| Date | 10 September 2015 |
| Creators | Agra, Kennedy Leite |
| Contributors | 93928254049, http://lattes.cnpq.br/2531075321550052, Bezerra, Claudionor Gomes, 60992565472, http://lattes.cnpq.br/5085046065890176, Medeiros, Suzana N?brega de, 78609801420, http://lattes.cnpq.br/2148858591663240, Silva, Ricardo Barreto da, 89974921015, http://lattes.cnpq.br/8538297526477728, Suarez, Roberto L?zaro Rodriguez, 01314630474, http://lattes.cnpq.br/3693365352022151, Bohn, Felipe, Correa, M?rcio Assolin |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM F?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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