Journal
APPLIED PHYSICS LETTERS
Volume 80, Issue 22, Pages 4268-4270Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1483924
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Using differential scanning calorimetry, the enthalpy (activation energy) for the A1 to L1(0) transformation in FePt and CoPt thin films have been measured as -10.2+/-2.1 kJ/g -atom (1.7+/-0.1 eV) and -3.1+/-0.2 kJ/g-atom (2.8+/-0.2 eV), respectively. FePt is further seen to transform at temperatures that are approximately 120 degreesC lower than those for CoPt. The enthalpy of grain growth that accompanies the transformation is shown to be negligibly small by comparison to the transformation enthalpy in both films. The impact of our findings on alloy development for ultrahigh density magnetic storage media is discussed. (C) 2002 American Institute of Physics.
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