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Structure and magnetic properties of iron nanoparticles stabilized in carbon

Enz, Thorsten and Winterer, Markus and Stahl, Branko and Bhattacharya, Sarbari and Miehe, Gerhard and Foster, Keir and Fasel, Claudia and Hahn, Horst (2006):
Structure and magnetic properties of iron nanoparticles stabilized in carbon.
In: Journal of Applied Physics, American Institute of Physics, pp. 044306-1, 99, (4), ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.2173185],
[Article]

Abstract

Nanoparticles composed of iron and carbon have been produced by chemical vapor synthesis. A detailed structural, electronic, and magnetic characterization has been performed by several methods. The atomic arrangement in the as-prepared particles is strongly affected and stabilized by excess carbon. Small clusters of different ferrous phases are the building blocks of the particles. Due to the in situ formation of a carbonaceous shell the particles are stable against oxidation at ambient conditions. The magnetic properties are influenced by the exceptionally small particle size. The particles exhibit superparamagnetic behavior with a blocking temperature of 30 K and the temperature dependence of the magnetization is governed by the finite size of the system

Item Type: Article
Erschienen: 2006
Creators: Enz, Thorsten and Winterer, Markus and Stahl, Branko and Bhattacharya, Sarbari and Miehe, Gerhard and Foster, Keir and Fasel, Claudia and Hahn, Horst
Title: Structure and magnetic properties of iron nanoparticles stabilized in carbon
Language: English
Abstract:

Nanoparticles composed of iron and carbon have been produced by chemical vapor synthesis. A detailed structural, electronic, and magnetic characterization has been performed by several methods. The atomic arrangement in the as-prepared particles is strongly affected and stabilized by excess carbon. Small clusters of different ferrous phases are the building blocks of the particles. Due to the in situ formation of a carbonaceous shell the particles are stable against oxidation at ambient conditions. The magnetic properties are influenced by the exceptionally small particle size. The particles exhibit superparamagnetic behavior with a blocking temperature of 30 K and the temperature dependence of the magnetization is governed by the finite size of the system

Journal or Publication Title: Journal of Applied Physics
Volume: 99
Number: 4
Publisher: American Institute of Physics
Uncontrolled Keywords: Fine-particle systems, nanocrystalline materials, Fe and its alloys, Metals and alloys, Magnetization curves, hysteresis, Barkhausen and related effects
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Apr 2012 07:21
Official URL: http://dx.doi.org/10.1063/1.2173185
Identification Number: doi:10.1063/1.2173185
Funders: The authors gratefully acknowledge the financial support by the German Research Foundation and the DFG Center for Functional Nanostructures for individual research grant.
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