Thermal stability of ledge-type L10-FePt/Fe exchange-spring nanocomposites for ultrahigh recording densities

Goll, D.; Macke, S.
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p152512
Academic Journal
Long-term thermal stability is crucial for magnetic nanoparticles in ultrahigh density magnetic recording. For ledge-type exchange-spring nanocomposites consisting of a hard magnetic L10-FePt part and a soft magnetic Fe part of more extended horizontal size, the minimum energy barriers for thermal reversal between equilibrium states of the hysteresis loops are determined using a nudged-elastic-band path approach. The field dependence of the energy barrier can be described approximately by power laws. It turns out that nanopatterns of isolated ledge-type L10-FePt/Fe composite elements or isolated L10-FePt nanodots covered by a thin Fe film are well-suited in realizing ultrahigh recording densities.


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