title: Transient Grating Spectroscopy in Magnetic Thin Films: Simultaneous Detection of Elastic and Magnetic Dynamics.
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.
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Janušonis
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
authors.forename: T
authors.initials: T
authors.lastname: Jansma
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
authors.forename: C L
authors.initials: CL
authors.lastname: Chang
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
authors.forename: Q
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Gatilova
authors.affiliation: LAUM CNRS 6613, Université du Maine, 72085 Le Mans cedex, France.
authors.forename: A M
authors.initials: AM
authors.lastname: Lomonosov
authors.affiliation: IMMM CNRS 6283, Université du Maine, 72085 Le Mans cedex, France.
authors.forename: V
authors.initials: V
authors.lastname: Shalagatskyi
authors.affiliation: IMMM CNRS 6283, Université du Maine, 72085 Le Mans cedex, France.
authors.forename: T
authors.initials: T
authors.lastname: Pezeril
authors.affiliation: IMMM CNRS 6283, Université du Maine, 72085 Le Mans cedex, France.|Fritz-Haber-Institut der Max-Planck-Gesellschaft, Abteilung Physikalische Chemie, Faradayweg 4-6, 14195 Berlin, Germany.
authors.forename: V V
authors.initials: VV
authors.lastname: Temnov
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
authors.forename: R I
authors.initials: RI
authors.lastname: Tobey