Effect of initial stress/strain state on order-disorder transformation of FePt thin films

Hsiao, S. N.; Yuan, F. T.; Chang, H. W.; Huang, H. W.; Chen, S. K.; Lee, H. Y.
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p232505
Academic Journal
Initial stress (σi) of a room-temperature deposited FePt films was manipulated to study the order-disorder transformation. We observed that, while σi was increased from -1.01 (compressive) to 0.18 GPa (tensile), the phase transformation activation energy decreased from 0.387 to 0.23 eV/atom. This causes a reduction in ordering temperature of about 100 °C. We also found that densification induces an increase in tensile stress of about 1 GPa before ordering. In the films with small σi, strong tension facilitates the nucleation of L10 FePt; however, if highly compressive σi cancels the densification tension, ordering is retarded causing higher ordering temperature.


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