Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications

Giri, Ashutosh; Wee, Sung Hun; Jain, Shikha; Hellwig, Olav; Hopkins, Patrick E.

doi:10.1038/srep32077

Title: Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications

Journal Article · Fri Aug 26 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep32077· OSTI ID:1378367

Giri, Ashutosh ^[1]; Wee, Sung Hun ^[2]; Jain, Shikha ^[2]; Hellwig, Olav ^[3]; Hopkins, Patrick E. ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
HGST, a Western Digital company, San Jose, CA (United States)
Chemnitz Univ. of Technology, Chemnitz (Germany); Helmholtz-Zentrum Dresden- Rossendorf, Dresden (Germany)

Here, 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.

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Research Organization:: Univ. of Virginia, Charlottesville, VA (United States). Dept. of Mechanical and Aerospace Engineering

Sponsoring Organization:: USDOE

OSTI ID:: 1378367

Journal Information:: Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Effect of atomic order/disorder on Cr segregation in Ni-Fe alloys Arora, Gaurav; Rawat, Kanishk D.; Aidhy, Dilpuneet S. Journal of Applied Physics, Vol. 124, Issue 11 https://doi.org/10.1063/1.5027521	journal	September 2018
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