Atomic layer deposition of ferromagnetic iron oxide films on three-dimensional substrates with tin oxide nanoparticles
| Autor: | Tõnis Arroval, Hugo Mändar, Mukesh C. Dimri, Aile Tamm, Tanel Tätte, Aleks Aidla, Uno Mäeorg, Jekaterina Kozlova, Kaupo Kukli, Raivo Stern |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Inorganic chemistry Iron oxide chemistry.chemical_element Nanoparticle 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Tin oxide 01 natural sciences 0104 chemical sciences Inorganic Chemistry Magnetization chemistry.chemical_compound Atomic layer deposition chemistry Chemical engineering Alkoxide Materials Chemistry 0210 nano-technology Tin |
| Zdroj: | Journal of Crystal Growth. 343:21-27 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/j.jcrysgro.2011.09.062 |
| Popis: | Magnetic iron oxide films were grown by atomic layer deposition. The films were grown from ferrocene and ozone precursors on planar and 3D SiO 2 /Si substrates. Some substrates were pre-covered with self-assembled SnO 2 nanoparticles, prepared by hydrolysis of tin alkoxide with large excess of water. All samples demonstrated hysteresis in magnetization-field curves, defined and characterized on both planar and 3D substrates. The films on SnO 2 possessed slightly higher coercivity and markedly higher saturation magnetization compared to the films on SiO 2 /Si. Both Fe 2 O 3 and Fe 3 O 4 were recognized in the as-deposited films without reducing Fe 2 O 3 in H 2 . The application of SnO 2 nanoparticles influenced the composition, also promoting growth and magnetization. The samples deposited at 350 °C on 3D substrates with nanoparticles exhibited saturation magnetization of 0.0075 emu/g, whereas in the samples without nanoparticles the magnetization remained at 0.0025 emu/g. The highest coercivity of 425 Oe was measured at room temperature in the film deposited at 400 °C on planar substrate with SnO 2 nanoparticles. |
| Databáze: | OpenAIRE |
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