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Plasma ion heating produces L10 FePt nanoclusters

  • Marlann Marinho Patterson (a1), Xiangxin Rui (a2), Xingzhong Li (a3), Jeff E. Shield (a4) and David Sellmyer (a5)...

In this study, cubic and spherical FePt clusters were created by inert gas condensation in an argon-helium dc sputter discharge under different flow and target power conditions. The plasma recipes for spherical and cubic clusters called for high He:Ar ratio, low target power and low He:Ar ratio, high target power, respectively. As expected, Langmuir probe measurements show the recipes led to larger ion density for the cubic case (2 × 108 cm−3 versus 6 × 106 cm−3 for spherical). We conclude that the larger density of argon ions increased the cluster-ion collision probability, heating the clusters in situ to promote atomic rearrangements and the formation of the ordered L10 crystal structure rather than the disordered fcc structure.

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  • EISSN: 1946-4274
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