Ground state lost but degeneracy found: the effective thermodynamics of artificial spin ice

Details Ground state lost but degeneracy found: the effective thermodynamics of artificial spin ice Ground state lost but degeneracy found: the effective thermodynamics of artificial spin ice

2007-02-14

arxiv.org/abs/cond-mat/0702320v2

Phys. Rev. Lett. 98, 217203 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures. Accepted by Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.98.217203

We analyze the rotational demagnetization of artificial spin ice, a recently realized array of nanoscale single-domain ferromagnetic islands. Demagnetization does not anneal this model system into its anti-ferromagnetic ground state: the moments have a static disordered configuration similar to the frozen state of the spin ice materials. We demonstrate that this athermal system has an effective extensive degeneracy and we introduce a formalism that can predict the populations of local states in this ice-like system with no adjustable parameters.

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