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

Here, we report on the out-of-plane thermal conductivities of tetragonal L1 0 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 L1 0 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:
 [1] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. HGST, a Western Digital company, San Jose, CA (United States)
  3. Chemnitz Univ. of Technology, Chemnitz (Germany); Helmholtz-Zentrum Dresden- Rossendorf, Dresden (Germany)
Publication Date:
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Virginia, Charlottesville, VA (United States). Dept. of Mechanical and Aerospace Engineering
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Information storage; Surfaces, interfaces and thin films
OSTI Identifier:
1378367

Giri, Ashutosh, Wee, Sung Hun, Jain, Shikha, Hellwig, Olav, and Hopkins, Patrick E. Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications. United States: N. p., Web. doi:10.1038/srep32077.
Giri, Ashutosh, Wee, Sung Hun, Jain, Shikha, Hellwig, Olav, & Hopkins, Patrick E. Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications. United States. doi:10.1038/srep32077.
Giri, Ashutosh, Wee, Sung Hun, Jain, Shikha, Hellwig, Olav, and Hopkins, Patrick E. 2016. "Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications". United States. doi:10.1038/srep32077. https://www.osti.gov/servlets/purl/1378367.
@article{osti_1378367,
title = {Influence of chemical ordering on the thermal conductivity and electronic relaxation in FePt thin films in heat assisted magnetic recording applications},
author = {Giri, Ashutosh and Wee, Sung Hun and Jain, Shikha and Hellwig, Olav and Hopkins, Patrick E.},
abstractNote = {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.},
doi = {10.1038/srep32077},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {2016},
month = {8}
}

Works referenced in this record:

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  • Trebino, Rick; DeLong, Kenneth W.; Fittinghoff, David N.
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