Dynamics of Magnetization Reversal in Models of Magnetic Nanoparticles and Ultrathin Films

Rikvold, Per Arne; Brown, Gregory A.; Mitchell, SJ; Novotny, M. A.

doi:10.1007/3-540-36872-8_10

Cited by 6 publications

(5 citation statements)

References 77 publications

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“…Evaluation of growth and decay rates for clusters of different size with the change of external field and temperature has been studied [8]. Dynamics of magnetization reversal in models of magnetic nanoparticles and ultra-thin films have been discussed [9]. Simulation of magnetisation switching in nanoparticle system was studied [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of random fields on the reversal of magnetisation of Ising ferromagnet

Naskar

Acharyya

2020

Physica A: Statistical Mechanics and its Applications

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We study the reversal time of magnetisation in two dimensional Ising ferromagnet in the presence of externally applied uniform magnetic field using Monte Carlo simulation based on Metropolis single spin flip algorithm. Then we investigate the change in reversal time in presence of quenched random field in addition to the uniform (over the space) magnetic field. We report the results of distribution of reversal times of different samples in the presence of three different types of the distributions (namely, uniform, bimodal and normal) of random fields and compared the results with those obtained for uniform field only. We have observed that the reversal time decreases in presence of any kind (of distribution) of the random fields. Dependence of reversal times on temperature and different widths of random fields are also reported. We also checked whether the system obey Becker-Döring theory of classical nucleation in presence of random field and tried to investigate the range of the width of the distribution of random field, beyond which the system seems to fail to behave as prescribed by Becker-Döring theory.

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Section: Introductionmentioning

confidence: 99%

Effects of random fields on the reversal of magnetisation of Ising ferromagnet

Naskar

Acharyya

2020

Physica A: Statistical Mechanics and its Applications

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“…One wants to have rapid switching of magnetization under reversals of an external field, but no spontaneus reversals of the magnetization, even if the external field has been turned off. In the literature much attention has been paid to reversal time distributions in the presence of a driving field [1,2], but spontaneous re-versals in the absence of a field have hardly been studied. Here we consider the latter case for the prototypical case of an Ising model with periodic boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal times in the two-dimensional Ising model

2003

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We present a theoretical framework which is generally applicable to the study of time scales of activated processes in systems with Brownian type dynamics. This framework is applied to a prototype system: magnetization reversal times in the two-dimensional Ising model. Direct simulation results for the magnetization reversal times, spanning more than five orders of magnitude, are compared with theoretical predictions; the two agree in most cases within 20%.

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“…In particular, the dynamics of interfaces such as phase-and grain boundaries in solid materials [1] and domain walls in magnets [2] and ferroelectrics heavily influence both dynamic and static materials properties. Among interfaces characteristic of two-dimensional systems are steps on crystal surfaces [3], domain walls in thin magnetic and dielectric films [2], and boundaries between different types of vegetation such as savanna and rainforest [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and velocity of field-driven solid-on-solid interfaces: Analytic approximations and numerical results

Rikvold

Kolesík

2002

Phys. Rev. E

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The local structure of a solid-on-solid (SOS) interface in a two-dimensional kinetic Ising ferromagnet with single-spin-flip Glauber dynamics, which is driven far from equilibrium by an applied field, is studied by an analytic mean-field, nonlinear-response theory [P. A. Rikvold and M. Kolesik, J. Stat. Phys. 100, 377 (2000)] and by dynamic Monte Carlo simulations. The probability density of the height of an individual step in the surface is obtained, both analytically and by simulation. The width of the probability density is found to increase dramatically with the magnitude of the applied field, with close agreement between the theoretical predictions and the simulation results. Excellent agreement between theory and simulations is also found for the field-dependence and anisotropy of the interface velocity. The joint distribution of nearest-neighbor step heights is obtained by simulation. It shows increasing correlations with increasing field, similar to the skewness observed in other examples of growing surfaces.

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Dynamics of Magnetization Reversal in Models of Magnetic Nanoparticles and Ultrathin Films

Cited by 6 publications

References 77 publications

Effects of random fields on the reversal of magnetisation of Ising ferromagnet

Effects of random fields on the reversal of magnetisation of Ising ferromagnet

Magnetization reversal times in the two-dimensional Ising model

Microstructure and velocity of field-driven solid-on-solid interfaces: Analytic approximations and numerical results

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