Energy minimization and ac demagnetization in a nanomagnet array

X. Ke, J. Li, C. Nisoli, Paul E. Lammert, W. McConville, R. F. Wang, V. H. Crespi, P. Schiffer

Research output: Contribution to journalArticle

90 Scopus citations

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 languageEnglish (US)
Article number037205
JournalPhysical Review Letters
Volume101
Issue number3
DOIs
StatePublished - Jul 17 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Energy minimization and ac demagnetization in a nanomagnet array'. Together they form a unique fingerprint.

  • Cite this