Detalhes bibliográficos
| Resumo: | We investigate the origin of ferromagnetism induced in thin-film (similar to 20 nm) Fe-V alloys by their irradiation with subpicosecond laser pulses. We find with Rutherford backscattering that the magnetic modifications follow a thermally stimulated process of diffusion decomposition, with formation of a-few-nm-thick Fe enriched layer inside the film. Surprisingly, similar transformations in the samples were also found after their long-time (similar to 10(3) s) thermal annealing. However, the laser action provides much higher diffusion coefficients (similar to 4 orders of magnitude) than those obtained under standard heat treatments. We get a hint that this ultrafast diffusion decomposition occurs in the metallic glassy state achievable in laser-quenched samples. This vitrification is thought to be a prerequisite for the laser-induced onset of ferromagnetism that we observe. 2014 Elsevier B.V. All rights reserved. |
|---|
| Autores principais: | Polushkin, N. I. |
|---|
| Outros Autores: | Duarte, A. C.; Conde, O.; Alves, E.; Barradas, N. P.; García-García, A.; Kakazei, G. N.; Ventura, J. O.; Araújo, J. P.; Oliveira, Vitor; Vilar, R. |
|---|
| Assunto: | Metallic alloys Phase separation Laser quenching Ferromagnetism |
|---|
| Ano: | 2015 |
|---|
| País: | Portugal |
|---|
| Tipo de documento: | artigo |
|---|
| Tipo de acesso: | acesso restrito |
|---|
| Instituição associada: | Instituto Politécnico de Lisboa |
|---|
| Idioma: | inglês |
|---|
| Origem: | Repositório Científico do Instituto Politécnico de Lisboa |
|---|