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FePt L10 ordering and grain growth using millisecond pulse laser processing |
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| Authors: | Yuki Inaba Shishou Kang Jerald R Izatt Gregory B Thompson Tim Klemmer |
| Institution: | a Center for Materials and Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA b Department of Metallurgical and Materials Engineering, Box 870202, The University of Alabama, Tuscaloosa, AL 35487, USA c Department of Physics and Astronomy, Brigham Young University, Provo, UT 84602, USA d Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, AL 35487, USA e Seagate Technology, Fremont, CA 94538, USA |
| Abstract: | The structural and magnetic properties of ∼12 nm thick FePt thin films grown on Si substrates annealed using a 1064 nm wavelength laser with a 10 ms pulse have been examined. The A1 to L10 ordering phase transformation was confirmed by electron and X-ray diffraction. An order parameter near 50% and a maximum coercivity of 12 kOe were obtained with laser energy densities of 25-32 J/cm2. Grain growth, quantified by dark field transmission electron microscopy, occurred during chemical ordering at the laser pulse widths studied. |
| Keywords: | FePt Laser annealing L10 ordering Grain growth |
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