Files
Document type
ArticleVersion
Published versionPublication date
All rights reserved
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/129602
Magnetic domains and surface effects in hollow maghemite nanoparticles
Journal Title
Director/Tutor
Journal ISSN
Volume Title
Related resource
Abstract
In the present work, we investigate the magnetic properties of ferrimagnetic and noninteracting maghemite gamm-Fe2O3 hollow nanoparticles obtained by the Kirkendall effect. From the experimental characterization of their magnetic behavior, we find that polycrystalline hollow maghemite nanoparticles exhibit low blocked to superparamagnetic transition temperatures, small magnetic moments, significant coercivities and irreversibility fields, and no magnetic saturation on external magnetic fields up to 5 T. These results are interpreted in terms of the microstructural parameters characterizing the maghemite shells by means of atomistic Monte Carlo simulations of an individual spherical shell. The model comprises strongly interacting crystallographic domains arranged in a spherical shell with random orientations and anisotropy axis. The Monte Carlo simulation allows discernment between the influence of the polycrystalline structure and its hollow geometry, while revealing the magnetic domain arrangement in the different temperature regimes.
Subject (English)
Citation
Citation
BATLLE GELABERT, Xavier, IGLESIAS, Òscar and LABARTA, Amílcar. Magnetic domains and surface effects in hollow maghemite nanoparticles. Physical Review B. 2009. Vol. 79, num. 094419-1-094419-7. ISSN 1098-0121. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/129602