Caracterização de multicamadas de NiFe/FeMn para medidas de magnetoimpedância assimétrica abaixo de 2 GHz
In this work the giant magnetoimpedance effect (GMI) was investigated in exchange biased Ni81Fe19/Fe50Mn50 bilayers. The study samples were deposited on glass substrate by magnetron sputtering. The exchange bias (EB) was induced during the deposition by the aplication of a 2 kOe static field. The st...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Brasil |
| Institución: | Universidade Federal de Santa Maria (UFSM) |
| Repositorio: | Manancial - Repositório Digital da UFSM |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufsm.br:1/16453 |
| Acceso en línea: | http://repositorio.ufsm.br/handle/1/16453 |
| Access Level: | acceso abierto |
| Palabra clave: | Magnetoimpedância Ressonância ferromagnética Impedância Magnetoimpedance Ferromagnetic resonance Impedance CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
| Sumario: | In this work the giant magnetoimpedance effect (GMI) was investigated in exchange biased Ni81Fe19/Fe50Mn50 bilayers. The study samples were deposited on glass substrate by magnetron sputtering. The exchange bias (EB) was induced during the deposition by the aplication of a 2 kOe static field. The studied parameters were the thickness of the ferromagnetic material (NiFe) that was varied between 150 and 250 nm and the number of bilayers n = 1, 2 and 3. The structural characterization was performed by high angle x-ray difraction (XRD) technique in a configuration − 2 and using Cu- K radiation. The static magnetic characterization was performed with a alternating gradient field magnetometer (AGFM). The resistive and reactive components of the impedance were measured as function of the frequency (100 MHz-1,8 GHz) and the static field (H = ±200 Oe). The results shown that the effect increase with the number of bilayers reaching about 300% for n = 3. The Z vs. H curves show good linearity for |H| 1 Oe, the sensitivity also grows with the thickness of the NiFe and the number of bilayers reaching 9% /Oe for n = 3. |
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