Magnetization dynamics in nanostructures with weak/strong anisotropy
We investigate the high-frequency response of magnetization dynamics through magnetoimpedance (MI) effect in Permalloy-based multilayered thin films produced with two different non-magnetic metallic spacers: Cu and Ag. Due to the nature of the spacer materials, we are able to play with magnetic p...
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| Principais autores: | , , , , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
AIP Publishing LLC
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45026 |
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| Resumo: | We investigate the high-frequency response of magnetization dynamics through magnetoimpedance
(MI) effect in Permalloy-based multilayered thin films produced with two different non-magnetic
metallic spacers: Cu and Ag. Due to the nature of the spacer materials, we are able to play with
magnetic properties and to study both systems with weak/strong magnetic anisotropy. We verify
very rich features in the magnetoimpedance behavior and high magnetoimpedance ratios, with
values above 200%. We compare the MI results obtained in multilayered thin films with distinct
spacers and number of bilayers, and discuss them in terms of the different mechanisms that govern
the MI changes observed at distinct frequency ranges, intensity of the magnetic anisotropy,
alignment between dc magnetic field and anisotropy direction. Besides, by considering a theoretical
approach that takes into account two single models together and calculate the transverse magnetic
permeability and the MI effect, we support our interpretation via numerical calculations modeling
the effect of weak/strong magnetic anisotropy on the MI response. Thus, we confirm that these
features are very important for the use of multilayered films in sensor applications and, both the
frequency and field response can be tailored to fulfill the requirements of a given device |
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