Influência da desordem estrutural nas propriedades magnéticas de filmes finos de Co2FeAl
Thin films of Co2FeAl (CFA) and trilayers with CFA/M/CFA, where M is Au or Ag, produced by magnetron sputtering onto glass and oriented (MgO (100)) substrates were investigated. The structural, magnetic static and magnetic dynamics properties were analyzed by distinct experimental techniques. Thr...
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| Formato: | doctoralThesis |
| Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19906 |
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| Resumo: | Thin films of Co2FeAl (CFA) and trilayers with CFA/M/CFA, where M is Au
or Ag, produced by magnetron sputtering onto glass and oriented (MgO (100))
substrates were investigated. The structural, magnetic static and magnetic dynamics
properties were analyzed by distinct experimental techniques. Through
X-ray diffraction was observed an A2 phase for the samples (completely disordered),
where the atoms are randomly located in the lattice. The static magnetic
behavior, in some samples, reveal a plateau behavior generated by a biphasic
system. The magnetoimpedance measurements were performed by varying the
angle between the external magnetic field and current with respect of anisotropy
direction. For this reason, the MI results show a asymmetric magnetoimpedance
(AMI) behavior. For the single and trilayers samples with 500 nm-thick, the AMI
effect is more evident in comparison with samples with 1000 nm-thick. Therefore,
in this work was stablished a route to produce Heusler alloy samples with A2
phase in thin film geometry onto amorphous and oriented substrates, and due
to structural disorder was possible to study the hysteretic and MI asymmetric
effects. |
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