Three dimensional quantitative characterization of magnetite nanoparticles embedded in mesoporous silicon: local curvature, demagnetizing factors and magnetic Monte Carlo simulations

Uusimaki, Toni and Margaris, Georgios and Trohidou, Kalliopi and Granitzer, Petra and Rumpf, Klemens and Sezen, Meltem and Kothleitner, Gerald (2013) Three dimensional quantitative characterization of magnetite nanoparticles embedded in mesoporous silicon: local curvature, demagnetizing factors and magnetic Monte Carlo simulations. Nanoscale, 5 (23). pp. 11944-11953. ISSN 2040-3364 (Print) 2040-3372 (Online)

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Abstract

Magnetite nanoparticles embedded within the pores of a mesoporous silicon template have been characterized using electron tomography. Linear least squares optimization was used to fit an arbitrary ellipsoid to each segmented particle from the three dimensional reconstruction. It was then possible to calculate the demagnetizing factors and the direction of the shape anisotropy easy axis for every particle. The demagnetizing factors, along with the knowledge of spatial and volume distribution of the superparamagnetic nanoparticles, were used as a model for magnetic Monte Carlo simulations, yielding zero field cooling/field cooling and magnetic hysteresis curves, which were compared to the measured ones. Additionally, the local curvature of the magnetite particles' docking site within the mesoporous silicon's surface was obtained in two different ways and a comparison will be given. A new iterative semi-automatic image alignment program was written and the importance of image segmentation for a truly objective analysis is also addressed.
Item Type: Article
Subjects: T Technology > T Technology (General) > T174.7 Nanotechnology
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Chemistry
Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: Meltem Sezen
Date Deposited: 17 Jan 2014 16:19
Last Modified: 01 Aug 2019 15:23
URI: https://research.sabanciuniv.edu/id/eprint/23144

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