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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 University Pittsburgh, PA 15213, U.S.A.
S. Yamamuro
Affiliation:
Dept. of Physics, Carnegie Mellon University Pittsburgh, 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 University Pittsburgh, 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.

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