Size and thickness effect on magnetic structures of maghemite hollow magnetic nanoparticles
| Autor: | Nader Yaacoub, Jean-Marc Greneche, Fouad El Haj Hassan, Fatima Sayed, Y. Labaye, Rodaina Sayed Hassan |
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| Přispěvatelé: | Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Libanaise |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Nanostructure
Materials science Shell (structure) Physics::Optics Maghemite Nanoparticle Bioengineering 02 engineering and technology engineering.material 01 natural sciences Magnetization Nuclear magnetic resonance 0103 physical sciences General Materials Science [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] Anisotropy ComputingMilieux_MISCELLANEOUS 010302 applied physics [PHYS]Physics [physics] Condensed matter physics Magnetic moment General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Modeling and Simulation engineering Magnetic nanoparticles 0210 nano-technology |
| Zdroj: | Journal of Nanoparticle Research Journal of Nanoparticle Research, Springer Verlag, 2016, 18 (9), ⟨10.1007/s11051-016-3584-x⟩ |
| ISSN: | 1388-0764 1572-896X |
| DOI: | 10.1007/s11051-016-3584-x⟩ |
| Popis: | The effect of surface anisotropy on the magnetic ground state of hollow maghemite nanoparticles is investigated using atomistic Monte Carlo simulation. The computer modeling is carried on hollow nanostructures as a function of size and shell thickness. It is found that the large contribution of the surface anisotropy imposes a “throttled” spin structure where the moments located at the outer surface tend to orient normal to the surface while those located at the inner surface appear to be more aligned. For increasing values of surface anisotropy in the frame of a radial model, the magnetic moments become radially oriented either inward or outward giving rise to a “hedgehog” configuration with nearly zero net magnetization. We also show the effect of the size of hollow nanoparticle on the spin behavior where the spin non-collinearity increases (for fixed value of surface anisotropy) as the diameter of the hollow nanoparticle increases due to the significant increase in surface-to-volume ratio, the thickness being constant. Moreover, the thickness of the hollow nanoparticle shell influences the spin configuration and thus the relation between surface anisotropy and the size or the thickness of the hollow nanoparticle is established. |
| Databáze: | OpenAIRE |
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