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Structure and magnetic properties of iron nanoparticles stabilized in carbon

Enz, Thorsten ; Winterer, Markus ; Stahl, Branko ; Bhattacharya, Sarbari ; Miehe, Gerhard ; Foster, Keir ; Fasel, Claudia ; Hahn, Horst (2006):
Structure and magnetic properties of iron nanoparticles stabilized in carbon.
In: Journal of Applied Physics, 99 (4), pp. 044306-1. American Institute of Physics, ISSN 00218979,
[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 ; Winterer, Markus ; Stahl, Branko ; Bhattacharya, Sarbari ; Miehe, Gerhard ; Foster, Keir ; Fasel, Claudia ; 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
Journal 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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