Produção e estudo de multicamadas magnéticas em substrato flexível
Magnetic multilayers are the support for the production of spintronic devices, representing great possibilities for miniaturized electronics industry. having the control to produce devices as well as their physical properties from simple multilayer films to highly complex at the atomic scale is a...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20691 |
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| Resumo: | Magnetic multilayers are the support for the production of spintronic devices, representing
great possibilities for miniaturized electronics industry. having the control to produce devices
as well as their physical properties from simple multilayer films to highly complex at the atomic
scale is a fundamental need for progress in this area, in recent years has highlighted the
production of organic and flexible spintronic devices. Because of this trend, the objective of this work was to produce magnetic multilayers deposited on flexible substrate using magnetron sputtering dc technique. Three sets of samples were prepared. The first set composed of the trilayer type CoFe=Cu(t)=CoFe with different thickness of the metallic spacer. The second set consists of two multilayer subgroups, CoFe=Cu
in the presence of IrMn layer as a buffer and the next multilayer as cap layer. The third set
consisting of non-magnetostrictive multilayer permalloy (Py=Ta and Py=Ag) on flexible substrate
and glass. The magnetic properties, were investigated by magnetometry measurements,
ferromagnetic resonance and magnetoimpedance (MI), measurements were carried out at room
temperature with the magnetic field always applied on the sample plane. For structural analysis,
the diffraction X-ray was used. The results of the trilayer showed a high uniaxial anisotropy
field for the sample with a spacer of 4.2 nm. For the multilayer in the presence of IrMn layer as
the buffer, the study of static and dynamic magnetic properties showed isotropic behavior. For
the multilayer in the presence of IrMn layer as a cap, the results of static magnetic properties of
the magnetic behavior exhibited a spin valve structure type. However there was a disagreement
with results of ferromagnetic resonance measurements, which was justified by the contribution
of the unstable and stable grain to the rotatable anisotropy and Exchange bias in ferromagneticantiferromagnetic interface. The third serie of samples showed similar results behavior for the
MI Ag multilayers spacer in both substrates. There are also significant MI changes with the Ta
spacer, possible associated with the compressive stress on the flexible substrate sample. |
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