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

• Autor(a) principal: Maltez, Rogério Luis
• Data de Publicação: 1996
• Outros Autores: Amaral, Livio, Behar, Moni, Vantomme, A., Langouche, G., Lin, X.W.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/104169
• topic: Física da matéria condensada; Efeito mossbauer; Retroespalhamento rutherford; Tunelamento : Microscopia eletronica de transmissao

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.