Effect of carbon on structural and magnetic properties of $$\hbox {Ge}_{1-x}\hbox {Mn}_{x}$$ nanocolumns
| Autor: | V Le Thanh, L Michez, Thi Giang Le |
|---|---|
| Přispěvatelé: | Hong Duc University, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Surface diffusion
GeMn nanocolumns Materials science Reflection high-energy electron diffraction Annealing (metallurgy) Analytical chemistry Mn5Ge3 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences thermal stability 0104 chemical sciences Magnetization Ferromagnetism Electron diffraction Mechanics of Materials GeMn magnetization [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Curie temperature General Materials Science 0210 nano-technology human activities Molecular beam epitaxy carbon doping |
| Zdroj: | Bulletin of Materials Science Bulletin of Materials Science, 2020, 43 (1), pp.103. ⟨10.1007/s12034-020-2082-z⟩ |
| ISSN: | 0250-4707 |
| Popis: | We have investigated the structural and magnetic properties of $$\hbox {Ge}_{0.94}\hbox {Mn}_{0.06-\delta }\hbox {C}_{\delta }$$ films $$(\delta = 0.005, 0.01\ \hbox {and} 0.02)$$ using reflexion high-energy electron diffraction (RHEED) technique, transmission electron microscopy (TEM) and superconducting quantum interference device magnetometer. All films have been prepared by co-depositing Ge, Mn and C by molecular beam epitaxy. RHEED pattern shows the increase in sample surface roughness when doping carbon into the GeMn films. TEM analyses indicate that adding carbon greatly reduces the surface diffusion of both Ge and Mn elements. Ferromagnetic ordering in samples containing carbon contents of 0.01 and 0.02, persists at temperatures $${>}400\hbox { K}$$ . An increase in net magnetization is found for carbon-doped samples with increasing carbon content from 0.01 to 0.02. However, we found a decrease in the net magnetization and the Curie temperature of the samples after annealing at 450 and 650°C. The Curie temperature reduces down to about 300 K, which is comparable to the value of the free-carbon sample showing a harmful effect of the post-annealing on the magnetic properties of carbon-doped GeMn nanocolumns. |
| Databáze: | OpenAIRE |
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