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  Transient Grating Spectroscopy in Magnetic Thin Films: Simultaneous Detection of Elastic and Magnetic Dynamics

Janušonis, J., Jansma, T., Chang, C. L., Liu, Q., Gatilova, A., Lomonosov, A. M., et al. (2016). Transient Grating Spectroscopy in Magnetic Thin Films: Simultaneous Detection of Elastic and Magnetic Dynamics. Scientific Reports, 6: 29143. doi:10.1038/srep29143.

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Janušonis, J.1, Author
Jansma, T. 1, Author
Chang, C. L. 1, Author
Liu, Q. 1, Author
Gatilova, A. 1, Author
Lomonosov, A. M. 2, Author
Shalagatskyi, V. 3, Author
Pezeril, T.3, Author
Temnov, Vasily3, 4, Author              
Tobey, R. I. 1, Author
Affiliations:
1Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands, ou_persistent22              
2LAUM CNRS 6613, Université du Maine, 72085 Le Mans cedex, France, ou_persistent22              
3IMMM CNRS 6283, Université du Maine, 72085 Le Mans cedex, France, ou_persistent22              
4Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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 Abstract: Surface magnetoelastic waves are coupled elastic and magnetic excitations that propagate along the surface of a magnetic material. Ultrafast optical techniques allow for a non-contact excitation and detection scheme while providing the ability to measure both elastic and magnetic components individually. Here we describe a simple setup suitable for excitation and time resolved measurements of high frequency magnetoelastic waves, which is based on the transient grating technique. The elastic dynamics are measured by diffracting a probe laser pulse from the long-wavelength spatially periodic structural deformation. Simultaneously, a magnetooptical measurement, either Faraday or Kerr effect, is sensitive to the out-of-plane magnetization component. The correspondence in the response of the two channels probes the resonant interaction between the two degrees of freedom and reveals their intimate coupling. Unraveling the observed dynamics requires a detailed understanding of the spatio-temporal evolution of temperature, magnetization and thermo-elastic strain in the ferromagnet. Numerical solution of thermal diffusion in two dimensions provides the basis on which to understand the sensitivity in the magnetooptic detection.

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 Dates: 2016-03-202016-06-132016-07-05
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/srep29143
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: 10 Volume / Issue: 6 Sequence Number: 29143 Start / End Page: - Identifier: Other: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322