Rapid ordering of Zr-doped FePt alloy films

Lee, Seong-Rae; Yang, Sanghyun; Kim, Young Keun; Na, Jong Gab
June 2001
Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p4001
Academic Journal
The magnetic properties and microstructural evolution of Zr-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. Compared to an undoped Fe[sub 59]Pt[sub 41] binary film, Zr-doped FePt alloy films showed accelerated ordering transformation kinetics accompanying smaller grains: we were able to fabricate a Zr-doped FePt film [e.g., (Fe[sub 59]Pt[sub 41])[sub 97]Zr[sub 3]] possessing very fine grain size (5 nm in average) and high coercivity (7.3 kOe) within 10 min annealing at 500 °C. It is thought that the point defects and lattice strain introduced by Zr-doping activated the nucleation rate of the ordered phase. In particular, for Zr-doped FePt films containing less than 45 at. % Pt, the ordered L1[sub 0] phase was decomposed into a disordered phase after excessive annealing due to the formation of a Pt-Zr compound, most likely Pt[sub 3]Zr, that reduces the effective Pt content in the ordered phase. © 2001 American Institute of Physics.


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