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Winklhofer, Michael; Dumas, Randy K.; Liu, Kai (2008): 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
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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.