Amorphous Si layers co-doped with B and Mn: Thin film growth and steering of magnetic properties
| Autor: | Paolo Colombi, Luigi Sangaletti, Gabriele Salvinelli, Maria Cristina Mozzati, D. Visentin, Stefania Pagliara, Giovanni Drera |
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| Rok vydání: | 2015 |
| Předmět: |
Amorphous silicon
Materials science Doping Metals and Alloys Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Settore FIS/03 - FISICA DELLA MATERIA Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid Magnetization chemistry.chemical_compound Nuclear magnetic resonance chemistry Ferromagnetism Sputtering Materials Chemistry Boron Magnetism Manganese Photoemission 2506 Materials Chemistry2506 Metals and Alloys Thin film |
| Zdroj: | Thin Solid Films. 590:148-155 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2015.07.073 |
| Popis: | Amorphous silicon thin films co-doped with manganese (5% at.) and boron (1.8% at.) have been prepared by RF sputtering on Al 2 O 3 substrates held at room temperature (RT). The films, with an average thickness of about 0.9 μm, were carefully characterized by micro-Raman and X-ray photoemission spectroscopies. A ferromagnetic (FM) behavior up to RT was observed. In order to discuss and possibly rule out extrinsic effects usually related to segregations of ferromagnetic impurities in the samples, magnetization measurements were carried out on the Al 2 O 3 substrates, as well as on Si:B and Si:Mn films grown with the same RF sputtering system. Only the Si:B:Mn films displayed a FM behavior up to RT. Since amorphous films doped with Mn alone did not display any signature of FM ordering, boron co-doping results to be crucial for the onset of the FM behavior. The conductivity of the samples is not affected by boron doping that, therefore, does not appear to significantly contribute to a possible carrier-mediated FM interaction between Mn ions by supplying extra charges to the system. On this basis, the capability of B to hinder the quenching of the Mn 3d magnetic moments has also to be regarded as a possible role of this co-dopant in the observed magnetization. |
| Databáze: | OpenAIRE |
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