Magnetic patterns in dipolar films with close packed structures

Estévez-Rams, E.; León, H.

doi:10.1016/j.jmmm.2010.04.044

Cited by 1 publication

(1 citation statement)

References 34 publications

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“…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.…”

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confidence: 99%

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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