Abstract
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.
Original language | English (US) |
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Article number | 037205 |
Journal | Physical review letters |
Volume | 101 |
Issue number | 3 |
DOIs | |
State | Published - Jul 17 2008 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy