Mossbauer study of the magnetic character and ordering process of the cubic gamma-fesi/sub 2/ phase obtained by fe implantation into a si(100) matrix
The magnetic character and the ordering process of y-FeSi₂ precipitates formed by Fe implantation into Si(100) followed by ion-beam epitaxial crystallization (IBIEC) have been studied using the Mössbauer technique. Measurements performed at 4 K have shown no evidence of magnetic interaction indicati...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1996 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/104169 |
| Acceso en línea: | http://hdl.handle.net/10183/104169 |
| Access Level: | acceso abierto |
| Palabra clave: | Física da matéria condensada Efeito mossbauer Retroespalhamento rutherford Tunelamento : Microscopia eletronica de transmissao |
| Sumario: | The magnetic character and the ordering process of y-FeSi₂ precipitates formed by Fe implantation into Si(100) followed by ion-beam epitaxial crystallization (IBIEC) have been studied using the Mössbauer technique. Measurements performed at 4 K have shown no evidence of magnetic interaction indicating that the y-FeSi₂ phase is not of magnetic character. Conversely, conversion-electron Mössbauer experiments performed after the IBIEC procedure show basically the presence of a doublet, despite the cubic structure of the y-FeSi₂ precipitates. However, after 1 h of annealing at 600 °C, a singlet, which before was barely recognizable, became more pronounced. The singlet-to-doublet proportion increases with increasing Fe concentration (2 at.%≤Cp≤8.5 at.%), indicating that after annealing a better ordering in the y-FeSi₂ precipitates is achieved. This ordering is obtained by an adequate combination of Fe-implanted concentration and thermal annealing. These studies have been complemented by Rutherford backscattering and/or channeling and transmission electron microscopy experiments. |
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