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

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

doi:10.1103/PhysRevLett.76.1541

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

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

Physics

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

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 language	English (US)
Pages (from-to)	1541-1544
Number of pages	4
Journal	Physical Review Letters
Volume	76
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.76.1541
State	Published - 1996

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.76.1541

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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.",

author = "Scheinfein, {M. R.} and Kevin Schmidt and Heim, {K. R.} and Hembree, {G. G.}",

year = "1996",

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AU - Scheinfein, M. R.

AU - Schmidt, Kevin

AU - Heim, K. R.

AU - Hembree, G. G.

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

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

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