Ground state lost but degeneracy found: the effective thermodynamics of artificial spin ice
arXiv:cond-mat/0702320 · doi:10.1103/PhysRevLett.98.217203
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 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.
arXiv comment4 pages, 4 figures. Accepted by Phys Rev Lett
References in corpus (5)
- Spin Ice State in Frustrated Magnetic Pyrochlore Materials
- Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
- Artificial square ice and related dipolar nanoarrays
- Magnets with strong geometric frustration
- Demagnetization Protocols for Frustrated Interacting Nanomagnet Arrays
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