Thermal string excitations in artificial spin-ice square dipolar array

We report on a theoretical investigation of artificial spin-ice dipolar arrays using a nanoisland shape adopted from recent experiments (Farhan et al 2013 Nature Phys. 9 375). The number of thermal magnetic string excitations in the square lattice is drastically increased by a vertical displacement...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-07, Vol.26 (26), p.266006-266006
Main Authors: Thonig, D, Reißaus, S, Mertig, I, Henk, J
Format: Article
Language:English
Online Access:Get full text
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Summary:We report on a theoretical investigation of artificial spin-ice dipolar arrays using a nanoisland shape adopted from recent experiments (Farhan et al 2013 Nature Phys. 9 375). The number of thermal magnetic string excitations in the square lattice is drastically increased by a vertical displacement of rows and columns. We find large increments especially for low temperatures and for string excitations with quasi-monopoles of charges ± 4. By kinetic Monte Carlo simulations we address the thermal stability of such excitations, thereby providing time scales for their experimental observation.
ISSN:1361-648X