Energy minimization and AC demagnetization in a nanomagnet array

Details Energy minimization and AC demagnetization in a nanomagnet array Energy minimization and AC demagnetization in a nanomagnet array

2008-06-24

arxiv.org/abs/0806.3925v2

Phys. Rev. Lett. 101, 037205 (2008)

Physics

Condensed Matter

Materials Science

Published Version

Scientific paper

10.1103/PhysRevLett.101.037205

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.

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