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.
Published Web Locationhttp://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU00010300000707C518000001&idtype=cvips
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.