Title :
Influence of oxygen content on the reduction of the ordering temperature of L10 FePtCu alloy
Author :
Kikitsu, Akira ; Maeda, Tomoyuki ; Kai, Tadashi ; Nagase, Toshihiko ; Akiyama, Jun-Ichi ; Fujioka, Naomi ; Ishigami, Takashi
Author_Institution :
Corp. R&D Center, Kanagawa, Japan
Abstract :
The influence of the residual oxygen on the ordering (transformation from fcc to fct) temperature of sputtered Fe-Pt-Cu films was investigated. Secondary ion mass spectroscopy analysis revealed that high oxygen content increases the onset temperature of the ordering process. The oxygen is brought into an Fe-Pt-Cu film during the deposition process and forms stable Fe-O compound. This might increase the ordering temperature as well as prevent the coalescence of grains, that is, the nucleation of phase transformation. A hot-pressed Fe-Pt composite target which contains oxygen of 50 ppm was developed. This target is also effective for reducing the ordering temperature of Fe-Pt films.
Keywords :
copper alloys; iron alloys; metallic thin films; nucleation; order-disorder transformations; platinum alloys; secondary ion mass spectra; sputtered coatings; FCC-FCT phase transformation; FePtCu:O; L10 FePtCu alloy; grain coalescence; hot-pressed Fe-Pt composite target; nucleation; onset temperature; ordering temperature; residual oxygen content; secondary ion mass spectroscopy; sputtered film; Annealing; Coercive force; Iron; Magnetic analysis; Magnetic anisotropy; Magnetic films; Oxygen; Spectroscopy; Sputtering; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.815574
