Winklhofer, Michael; Dumas, Randy K.; Liu, Kai
Identifying reversible and irreversible magnetization changes in prototype patterned media using first- and second-order reversal curves.
In: Journal of Applied Physics, Vol. 103, No. 7
Full text not available from 'Open Access LMU'.
Arrays of nanomagnets have important potential applications as futuregeneration ultrahigh-density patterned magnetic recording media, inwhich each nanomagnet constitutes a single bit. We introduce a powerfultechnique to identify and quantify reversible and irreversiblemagnetization changes, a key challenge in characterizing these systems.The experimental protocol consists of measuring a few families ofsecond-order reversal curves along selected profiles in thefirst-order-reversal-curve diagram, which then can be decomposed intotruly irreversible switching events and reversible magnetizationchanges. The viability of the method is demonstrated for arrays ofsub-100-nm Fe nanomagnets, which exhibit complex magnetization reversalprocesses. (c) 2008 American Institute of Physics.