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arXiv · 1310.6902

Thermal String Excitations in Artificial Spin-Ice Dipolar Arrays

Danny Thonig·Stephan Reißaus·Ingrid Mertig·Jürgen Henk
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Abstract

We report on a theoretical investigation of artificial spin-ice dipolar arrays, using a nanoisland geometry adopted from recent experiments [A. Farhan \textit{et al.}, Nature Phys.\ \textbf{9} (2013) 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 $\pm 4$. By kinetic Monte Carlo simulations we address the thermal stability of such excitations, thereby providing time scales for their experimental observation.

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Danny Thonig, Stephan Reißaus, Ingrid Mertig, Jürgen Henk. 2014-01-24. Thermal String Excitations in Artificial Spin-Ice Dipolar Arrays. https://arxiv.org/abs/1310.6902

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