Phys. Rev. Lett. 101, 037205 (2008) [4 pages]Energy Minimization and ac Demagnetization in a Nanomagnet ArrayReceived 18 December 2007; published 17 July 2008 We study ac demagnetization in frustrated arrays of single-domain ferromagnetic islands, exhaustively resolving every (Ising-like) magnetic degree of freedom in the systems. Although the net moment of the arrays is brought near zero by a protocol with sufficiently small step size, the final magnetostatic energy of the demagnetized array continues to decrease for finer-stepped protocols and does not extrapolate to the ground-state energy. The resulting complex disordered magnetic state can be described by a maximum-entropy ensemble constrained to satisfy just nearest-neighbor correlations. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.037205
DOI:
10.1103/PhysRevLett.101.037205
PACS:
75.50.Lk, 75.75.+a
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