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

Cristiano Nisoli, Ruifang Wang, Jie Li, William F. McConville, Paul E. Lammert, Peter Schiffer, Vincent H. Crespi

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

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 antiferromagnetic 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 icelike system with no adjustable parameters.

Original languageEnglish (US)
Article number217203
JournalPhysical review letters
Volume98
Issue number21
DOIs
StatePublished - May 23 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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