title: Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications.
abstract: We report on the out-of-plane thermal conductivities of tetragonal L10 FePt (001) easy-axis and cubic A1 FePt thin films via time-domain thermoreflectance over a temperature range from 133 K to 500 K. The out-of-plane thermal conductivity of the chemically ordered L10 phase with alternating Fe and Pt layers is ~23% greater than the thermal conductivity of the disordered A1 phase at room temperature and below. However, as temperature is increased above room temperature, the thermal conductivities of the two phases begin to converge. Molecular dynamics simulations on model FePt structures support our experimental findings and help shed more light into the relative vibrational thermal transport properties of the L10 and A1 phases. Furthermore, unlike the varying temperature trends in the thermal conductivities of the two phases, the electronic scattering rates in the out-of-plane direction of the two phases are similar for the temperature range studied in this work.
authors: Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA.
authors: Ashutosh
authors: A
authors: Giri
authors: San Jose Research Center, HGST, a Western Digital company, San Jose, California 95135, USA.
authors: Sung Hun
authors: SH
authors: Wee
authors: San Jose Research Center, HGST, a Western Digital company, San Jose, California 95135, USA.
authors: Shikha
authors: S
authors: Jain
authors: Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany.|Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
authors: Olav
authors: O
authors: Hellwig
authors: Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA.
authors: Patrick E
authors: PE
authors: Hopkins