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Magnetic Interactions in Fe Nanoparticle Arrays

Published online by Cambridge University Press:  15 March 2011

D. Farrell ,
S. Yamamuro ,
Yumi Ijiri  and
S. A. Majetich
D. Farrell
Affiliation:
Dept. of Physics, Carnegie Mellon UniversityPittsburgh, PA 15213, U.S.A.
S. Yamamuro
Affiliation:
Dept. of Physics, Carnegie Mellon UniversityPittsburgh, PA 15213, U.S.A.
Yumi Ijiri
Affiliation:
Dept. Of Physics, Oberlin College Oberlin, OH 44074
S. A. Majetich
Affiliation:
Dept. of Physics, Carnegie Mellon UniversityPittsburgh, PA 15213, U.S.A.
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Abstract

The preparation of monodisperse Fe nanoparticles and self-assembly into hcp and fcc or fcc-like arrays is described. Here dipolar interactions dominate for the interparticle spacings studied (1.4-3.4 nm). Comparison of the low temperature magnetic properties of multilayer arrays with those of dilute suspensions of the same particles show increased coercivity and slower magnetic relaxation in the arrays. Mean field calculations of magnetic interaction fields suggest the type of ordered structures formed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 705: Symposium Y – Nanopatterning–From Ultralarge-Scale Integration to Biotechnology , 2001 , Y9.1
Copyright
Copyright © Materials Research Society 2002

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