Volume 48, Number 4, November II 1999
|455 - 460
|Condensed matter: electronic structure, electrical, magnetic and optical properties
|01 September 2002
RKKY interactions between nanomagnets of arbitrary shape
Department of Physics and Astronomy and Center for Materials Research and Analysis University of Nebraska, Lincoln, NE 68588, USA
Accepted: 21 September 1999
The RKKY interaction between well-separated magnetic particles in a nonmagnetic metallic matrix is calculated. It turns out that the net interaction can be mapped onto an RKKY interaction between two point-like effective moments. The effective moments exhibit a strongly oscillating dependence on the particle's size, shape, and orientation, but their magnitudes are governed by scaling laws. As a rule, magnetostatic interactions tend to suppress the RKKY effect in particles larger than about 1 nm. Surface roughness leaves the effective-moment picture unaltered but tends to yield a moderate reduction of the effective moments. The results are discussed in the context of magnetic recording, spin-glass magnetism, and cluster physics.
PACS: 75.50.Lk – Spin glasses and other random magnets / 75.10.Nr – Spin-glass and other random models / 75.70.Pa – Giant magnetoresistance
© EDP Sciences, 1999
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