Polarized neutron reflectivity study of the magnetization profile in anisotropy graded FePt films by ion irradiation.
To achieve high recording density, current technology demands for magnetic media with magnetization perpendicular to the film plane, high thermal stability and moderate coercivity. There is no known single phase materials that show all of these requisites. We have shown that Ar+ irradiation can be effectively used to transform a single phase, high coercivity, chemically ordered, FePt L10 thin film into a graded-anisotropy, exchange-coupled, composite media with tunable magnetic response. This can be exploited to produce a magnetic media with the desired magnetic behavior. We propose to use polarized neutron reflectivity measurements to determine the magnetic depth profile in the FePt irradiated films and consequently determining the dependence of the magnetic anisotropy with thickness and the ion beam parameters.
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ALGARABEL Pedro; ALBERTINI Franca; BERTOZZI Barbara; CASOLI Francesca; DI BONA Alessandro; LUPO Pierpaolo; MORELLON Luis and WILDES Andrew. (2013). Polarized neutron reflectivity study of the magnetization profile in anisotropy graded FePt films by ion irradiation.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-129
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