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Analytical and computational study of magnetization switching in kinetic Ising systems with demagnetizing fields

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Abstract

An important aspect of real ferromagnetic particles is the demagnetizing field resulting from magnetostatic dipole-dipole interaction, which causes large particles to break up into domains. Sufficiently small particles, however, remain single-domain in equilibrium. This makes such small particles of particular interest as materials for high-density magnetic recording media. In this paper we use analytic arguments and Monte Carlo simulations to study the effect of the demagnetizing field on the dynamics of magnetization switching in two-dimensional, single-domain, kinetic Ising systems. For systems in the Stochastic Region,'' where magnetization switching is on average effected by the nucleation and growth of fewer than two well-defined critical droplets, the simulation results can be explained by the dynamics of a simple model in which the free energy is a function only of magnetization. In the Multi-Droplet Region,'' a generalization of Avrami's Law involving a magnetization-dependent effective magnetic field gives good agreement with our simulations.

Most cited references65

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Equation of State Calculations by Fast Computing Machines

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Theory of dynamic critical phenomena

(1977)
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Crystal Statistics. I. A Two-Dimensional Model with an Order-Disorder Transition

(1944)
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Author and article information

Journal
13 December 1995
Article
10.1103/PhysRevB.54.4113
cond-mat/9512110