Surface Effects in Ultra Thin Iron Oxide Hollow Nanoparticles: Exploring Magnetic Disorder at the Nanoscale
| Autor: | Gurvinder Singh, P. Anil Kumar, F. Sayed, R. Sayed Hassan, Elisabetta Agostinelli, Nader Yaacoub, Roland Mathieu, Davide Peddis, George C. Hadjipanayis, Y. Labaye, Jean-Marc Greneche |
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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), CHU Pontchaillou [Rennes] |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Iron oxide Nanoparticle Physics::Optics 02 engineering and technology 01 natural sciences chemistry.chemical_compound Condensed Matter::Materials Science 0103 physical sciences Physical and Theoretical Chemistry [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics Hyperfine structure ComputingMilieux_MISCELLANEOUS Mossbauer spectrometry [PHYS]Physics [physics] Magnetic structure Hollow nanoparticles iron oxide magnetic disorder surface anisotropy Physik (inkl. Astronomie) 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Exchange bias chemistry Chemical physics Transmission electron microscopy Crystallite 0210 nano-technology |
| Zdroj: | Journal of physical chemistry. C 122 (2018): 7516–7524. doi:10.1021/acs.jpcc.8b00300 info:cnr-pdr/source/autori:F. Sayed (a,b); N. Yaacoub (a); Y. Labaye (a); R. Sayed Hassan (a,b); G. Singh (c); P. Anil Kumar (d); J. M. Greneche (a); R. Mathieu (e); G. C. Hadjipanayis (f); E. Agostinelli (g); and D. Peddis (g)/titolo:Surface Effects in Ultra Thin Iron Oxide Hollow Nanoparticles: Exploring Magnetic Disorder at the Nanoscale/doi:10.1021%2Facs.jpcc.8b00300/rivista:Journal of physical chemistry. C/anno:2018/pagina_da:7516/pagina_a:7524/intervallo_pagine:7516–7524/volume:122 Journal of Physical Chemistry C Journal of Physical Chemistry C, American Chemical Society, 2018, 122 (13), pp.7516-7524. ⟨10.1021/acs.jpcc.8b00300⟩ |
| ISSN: | 1932-7447 1932-7455 |
| DOI: | 10.1021/acs.jpcc.8b00300 |
| Popis: | A detailed study of the structural and magnetic properties of polycrystalline hollow ?-Fe2O3 nanoparticles of ~9.4 nm size was performed. High-resolution transmission electron microscopy images confirmed the crystalline structure and the presence of a ultrathin shell thickness of ~1.4 nm, implying a very high surface/volume ratio. These hollow nanoparticles were investigated using zero-field and in-field 57Fe Mössbauer spectrometry. The zero-field hyperfine structure suggests some topological disorder, whereas the in-field one shows the presence of a comp magnetic structure that can be fairly described as two opposite pseudosperomagnetic sublattices attributed to octahedral and tetrahedral iron sites. Such an unusual feature is consistent with the presence of noncollinear spin structure originated from the increased surface due to the hollow morphology. Such a complex local spin structure evidenced from Mössbauer experiments was correlated with exchange bias coupling showing at low temperature by magnetization measurements. Monte Carlo simulations on a ferrimagnetic hollow nanoparticle unambiguously corroborate the critical role of the surface anisotropy on the noncollinearity of spin structure in our samples. |
| Databáze: | OpenAIRE |
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