Diversity enabling equilibration: disorder and the ground state in artificial spin ice

Details Diversity enabling equilibration: disorder and the ground state in artificial spin ice Diversity enabling equilibration: disorder and the ground state in artificial spin ice

2011-08-02

arxiv.org/abs/1108.0536v2

Phys. Rev. Lett. 107, 217204 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.107.217204

We report a novel approach to the question of whether and how the ground state can be achieved in square artificial spin ices where frustration is incomplete. We identify two types of disorder: quenched disorder in the island response to fields and disorder in the sequence of driving fields. Numerical simulations show that quenched disorder can lead to final states with lower energy, and disorder in the driving fields always lowers the final energy attained by the system. We use a network picture to understand these two effects: disorder in island responses creates new dynamical pathways, and disorder in driving fields allows more pathways to be followed.

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