Title :
Effect of added Cu on disorder-order transformation of L10-FePt
Author :
Maeda, T. ; Kikitsu, A. ; Kai, T. ; Nagase, T. ; Aikawa, H. ; Akiyama, J.
Author_Institution :
Corporate Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan
fDate :
9/1/2002 12:00:00 AM
Abstract :
The L10-FePt ordered phase is formed at lower annealing temperature by addition of Cu. FePtCu films start ordering at 300°C or a lower temperature, whereas FePt and FePtAg films are still disordered alloys after annealing at 300°C. The results of X-ray diffraction indicate that FePt and the added Cu form an FePtCu ternary alloy, whereas FePtAg decomposes into FePt and Ag phases in the disorder-order transformation. From thermodynamic considerations, it is concluded that reduction of the ordering temperature of FePt is due to the formation of an FePtCu solid solution.
Keywords :
X-ray diffraction; alloying additions; annealing; coercive force; copper alloys; decomposition; ferromagnetic materials; iron alloys; magnetic thin films; order-disorder transformations; platinum alloys; sputtered coatings; 300 C; Cu addition effect; FePt; FePt films; FePtAg; FePtAg films; FePtCu; FePtCu L10-ordered films; FePtCu solid solution; FePtCu ternary alloy; RF magnetron sputtering; X-ray diffraction; annealing temperature; dc magnetron sputtering; disorder-order transformation; high anisotropy materials; in-plane coercivity; ordering temperature reduction; phase decomposition; thermodynamic consideration; ultrahigh recording density; Annealing; Coercive force; Copper alloys; Heat treatment; Magnetic anisotropy; Magnetic materials; Plasma temperature; Solids; Substrates; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.803105
