Randomly Distributed Vacancies Influence on Magnetic Properties of the Bilayer Thin Film

Bîrsan, E.

doi:10.1007/s10948-009-0486-5

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…We have thus, as our new estimate for the mean critical temperature T c = 0.944 (1). Using this new value of the critical temperature we obtain β/ν = 0.149 (7) in the analysis of the magnetization data.…”

Section: Simulation Resultsmentioning

confidence: 71%

“…The concept of symmetry breaking and universality transcend the subject of physics to many other areas, being thus of great importance. More recently, mainly due to the growing interest in magnetic thin-films, magnetic nano-dots and arrays of magnetic nanoparticles [1][2][3][4][5][6][7][8][9][10][11][12][13][14] , there were a renewed interest in the study of spin models.…”

Section: Introductionmentioning

confidence: 99%

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Phase transition in two-dimensional magnetic systems with dipolar interactions

Mól,

Costa

2011

Preprint

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In this work we have used extensive Monte Carlo calculations to study the planar to paramagnetic phase transition in the two-dimensional anisotropic Heisenberg model with dipolar interactions (AHd) considering the true long-range character of the dipolar interactions by means of the Ewald summation. Our results are consistent with an order-disorder phase transition with unusual critical exponents in agreement with our previous results for the Planar Rotator model with dipolar interactions. Nevertheless, our results disagrees with the Renormalization Group results of Maier and Schwabl [PRB, 70, 134430 (2004)] and the results of Rapini et. al. [PRB, 75, 014425 (2007)],where the AHd was studied using a cut-off in the evaluation of the dipolar interactions. We argue that besides the long-range character of dipolar interactions their anisotropic character may have a deeper effect in the system than previously believed. Besides, our results shows that the use of a cut-off radius in the evaluation of dipolar interactions must be avoided when analyzing the critical behavior of magnetic systems, since it may lead to erroneous results.

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Section: Simulation Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Phase transition in two-dimensional magnetic systems with dipolar interactions

Mól,

Costa

2011

Preprint

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“…6. A general Hamiltonian model for a magnetic nano-dot can be written in a pseudo-spin language as (for a revision on the subject, see [66][67][68][69][70][71][72][73])…”

Section: Dynamical Behavior Of Vortices In Magnetic Nano-structuresmentioning

confidence: 99%

Vortices in Low-Dimensional Magnetic Systems

Costa

2011

Braz J Phys

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Vortices are objects that are important to describe several physical phenomena. There are many examples of such objects in nature as in a large variety of physical situations like in fluid dynamics, superconductivity, magnetism, and biology. Historically, the interest in magnetic vortex-like excitations begun in the 1960s. That interest was mainly associated with an unusual phase-transition phenomenon in two-dimensional magnetic systems. More recently, direct experimental evidence for the existence of magnetic vortex states in nano-disks was found. The interest in such model was renewed due to the possibility of the use of magnetic nano-disks as bit elements in nano-scale memory devices. The goal of this study is to review some key points for the understanding of the vortex behavior and the progress that have been done in the study of vortices in low-dimensional magnetic systems.

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Dynamical behavior of vortices in thin film magnetic systems

Costa

Lima

2012

Journal of Magnetism and Magnetic Materials

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Randomly Distributed Vacancies Influence on Magnetic Properties of the Bilayer Thin Film

Cited by 4 publications

References 14 publications

Phase transition in two-dimensional magnetic systems with dipolar interactions

Phase transition in two-dimensional magnetic systems with dipolar interactions

Vortices in Low-Dimensional Magnetic Systems

Dynamical behavior of vortices in thin film magnetic systems

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