Temperature dependence of magnetization reversal in Co and Fe3O4 nanowire arrays

In this paper, we investigate the magnetization reversal of cobalt and magnetite nanowires, 4nm in diameter, synthesized within the pores of mesoporous silica thin films. A SQUID magnetometer was used to study the magnetic properties of the nanowire arrays over a broad temperature interval, T=1.8–30...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2005-02, Vol.286, p.171-176
Main Authors: Kazakova, Olga, Erts, Donats, Crowley, Timothy A., Kulkarni, Jaideep S., Holmes, Justin D.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
FCC cobalt
Magnetic properties and materials
Magnetite
Magnetization reversal
Nanowires
Physics
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Summary:In this paper, we investigate the magnetization reversal of cobalt and magnetite nanowires, 4nm in diameter, synthesized within the pores of mesoporous silica thin films. A SQUID magnetometer was used to study the magnetic properties of the nanowire arrays over a broad temperature interval, T=1.8–300K. The magnetization reversal process was found to be strongly temperature dependent. While a coherent rotation may occur at room temperature, a process involving the formation of domain structures takes place as the temperature decreases down to 1.8K.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.09.128