L10 Ordering of FePt Thin Films using Sub-10 ms Laser Pulses

Abstract

The structural and magnetic properties of 10 nm FePt thin films annealed using a 1064 nm wavelength laser with 10, 7.5, 5.0, and 2.5 ms pulses have been examined. The A1 to L10 phase transformation was confirmed by x-ray diffraction (XRD). The maximum order parameter of 0.53 and coercivity of 5.36 kOe can be obtained with 10 ms pulse width laser annealing at a laser energy fluence of 10 J/cm2. The order parameter of the furnace annealed samples was approximately 1.0 suggesting that 10 ms is insufficient to obtain a fully ordered phase. The laser annealed grain size, as measured by in-plane XRD analysis, is 24 % smaller than that of furnace annealed sample for an equivalent order parameter demonstrating the merit of short time annealing.

Description
Keywords
Crystallography, Annealing, Glass, X-ray diffraction, Thin films, Chemical compounds and components, Phase transitions, Superlattices, Oscilloscopes, Thermodynamic states and processes
Citation
Inaba, Y., et al. (2009): L10 Ordering of FePt Thin Films using Sub-10 ms Laser Pulses. Journal of Applied Physics, 105(7).