Magnetic order in two-dimensional arrays of nanometer-sized superparamagnets

M. R. Scheinfein, Kevin Schmidt, K. R. Heim, G. G. Hembree

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Abstract

Random two-dimensional island assemblies have three magnetic phases at room temperature as a function of island radius a. These magnetic states are a perpendicularly magnetized random antiferromagnet (a < 1.5nm), an in-plane superparamagnet (1.5 < a < 3nm), and an in-plane ferromagnet (a > 3.0nm) in a superferromagnetic regime. Mean-field and Monte Carlo methods are used to examine order-disorder transitions in two dimensions, and to set minimum interisland coupling strengths.

Original languageEnglish (US)
Pages (from-to)1541-1544
Number of pages4
JournalPhysical Review Letters
Volume76
Issue number9
DOIs
StatePublished - Jan 1 1996

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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