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Open Access Publications from the University of California

Identifying reversible and irreversible magnetization changes in prototype patterned media using first- and second-order reversal curves

  • Author(s): Winklhofer, Michael
  • Dumas, Randy K.
  • Liu, Kai
  • et al.

Arrays of nanomagnets have important potential applications as future generation ultrahigh-density patterned magnetic recording media, in which each nanomagnet constitutes a single bit. We introduce a powerful technique to identify and quantify reversible and irreversible magnetization changes, a key challenge in characterizing these systems. The experimental protocol consists of measuring a few families of second-order reversal curves along selected profiles in the first-order-reversal-curve diagram, which then can be decomposed into truly irreversible switching events and reversible magnetization changes. The viability of the method is demonstrated for arrays of sub-100-nm Fe nanomagnets, which exhibit complex magnetization reversal processes.

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