Demagnetization protocols for frustrated interacting nanomagnet arrays

R. F. Wang, J. Li, W. McConville, C. Nisoli, X. Ke, J. W. Freeland, V. Rose, M. Grimsditch, Paul Edward Lammert, Vincent Henry Crespi, P. Schiffer

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We report a study of demagnetization protocols for frustrated arrays of interacting single-domain permalloy nanomagnets by rotating the arrays in a changing magnetic field. The most effective demagnetization is achieved by not only stepping the field strength down while the sample is rotating, but also by combining each field step with alternation in the field direction. By contrast, linearly decreasing the field strength or stepping the field down without alternating the field direction leaves the arrays with a larger remanent magnetic moment. These results suggest that nonmonotonic variations in field magnitude around and below the coercive field are important for the demagnetization process.

Original languageEnglish (US)
Article number09J104
JournalJournal of Applied Physics
Issue number9
StatePublished - May 21 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Wang, R. F., Li, J., McConville, W., Nisoli, C., Ke, X., Freeland, J. W., Rose, V., Grimsditch, M., Lammert, P. E., Crespi, V. H., & Schiffer, P. (2007). Demagnetization protocols for frustrated interacting nanomagnet arrays. Journal of Applied Physics, 101(9), [09J104].