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Title: Layer specific observation of slow thermal equilibration in ultrathin metallic nanostructures by femtosecond X-ray diffraction

Abstract

Ultrafast heat transport in nanoscale metal multilayers is of great interest in the context of optically induced demagnetization, remagnetization and switching. If the penetration depth of light exceeds the bilayer thickness, layer-specific information is unavailable from optical probes. Femtosecond diffraction experiments provide unique experimental access to heat transport over single digit nanometer distances. Here, we investigate the structural response and the energy flow in the ultrathin double-layer system: gold on ferromagnetic nickel. Even though the excitation pulse is incident from the Au side, we observe a very rapid heating of the Ni lattice, whereas the Au lattice initially remains cold. The subsequent heat transfer from Ni to the Au lattice is found to be two orders of magnitude slower than predicted by the conventional heat equation and much slower than electron–phonon coupling times in Au. We present a simplified model calculation highlighting the relevant thermophysical quantities.

Authors:
 [1];  [2];  [1];  [3];  [4];  [5]; ORCiD logo [1];  [6]
  1. Universität Potsdam, Potsdam (Germany)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Technical Univ. Munich, Garching (Germany)
  4. Technical Univ. Munich, Garching (Germany); Universität Regensburg, Regensburg (Germany)
  5. Université Lorraine, Vandœuvre-lès-Nancy (France)
  6. Universität Potsdam, Potsdam (Germany); Helmholtz-Zentrum Berlin for Materials and Energy GmbH, Berlin (Germany)
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1511708
Grant/Contract Number:  
FG02-00ER15087
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Pudell, J., Maznev, A. A., Herzog, M., Kronseder, M., Back, C. H., Malinowski, G., von Reppert, A., and Bargheer, M. Layer specific observation of slow thermal equilibration in ultrathin metallic nanostructures by femtosecond X-ray diffraction. United States: N. p., 2018. Web. doi:10.1038/s41467-018-05693-5.
Pudell, J., Maznev, A. A., Herzog, M., Kronseder, M., Back, C. H., Malinowski, G., von Reppert, A., & Bargheer, M. Layer specific observation of slow thermal equilibration in ultrathin metallic nanostructures by femtosecond X-ray diffraction. United States. doi:10.1038/s41467-018-05693-5.
Pudell, J., Maznev, A. A., Herzog, M., Kronseder, M., Back, C. H., Malinowski, G., von Reppert, A., and Bargheer, M. Mon . "Layer specific observation of slow thermal equilibration in ultrathin metallic nanostructures by femtosecond X-ray diffraction". United States. doi:10.1038/s41467-018-05693-5. https://www.osti.gov/servlets/purl/1511708.
@article{osti_1511708,
title = {Layer specific observation of slow thermal equilibration in ultrathin metallic nanostructures by femtosecond X-ray diffraction},
author = {Pudell, J. and Maznev, A. A. and Herzog, M. and Kronseder, M. and Back, C. H. and Malinowski, G. and von Reppert, A. and Bargheer, M.},
abstractNote = {Ultrafast heat transport in nanoscale metal multilayers is of great interest in the context of optically induced demagnetization, remagnetization and switching. If the penetration depth of light exceeds the bilayer thickness, layer-specific information is unavailable from optical probes. Femtosecond diffraction experiments provide unique experimental access to heat transport over single digit nanometer distances. Here, we investigate the structural response and the energy flow in the ultrathin double-layer system: gold on ferromagnetic nickel. Even though the excitation pulse is incident from the Au side, we observe a very rapid heating of the Ni lattice, whereas the Au lattice initially remains cold. The subsequent heat transfer from Ni to the Au lattice is found to be two orders of magnitude slower than predicted by the conventional heat equation and much slower than electron–phonon coupling times in Au. We present a simplified model calculation highlighting the relevant thermophysical quantities.},
doi = {10.1038/s41467-018-05693-5},
journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {8}
}

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Works referenced in this record:

Nanoscale thermal transport
journal, January 2003

  • Cahill, David G.; Ford, Wayne K.; Goodson, Kenneth E.
  • Journal of Applied Physics, Vol. 93, Issue 2, p. 793-818
  • DOI: 10.1063/1.1524305