@article{MatternPudellDumesniletal.2023,
  author    = {Mattern, Maximilian and Pudell, Jan-Etienne and Dumesnil, Karine and von Reppert, Alexander and Bargheer, Matias},
  title     = {Towards shaping picosecond strain pulses via magnetostrictive transducers},
  series = {Photoacoustics},
  volume    = {30},
  journal   = {Photoacoustics},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {2213-5979},
  doi       = {10.1016/j.pacs.2023.100463},
  pages     = {7},
  year      = {2023},
  abstract  = {Using time-resolved x-ray diffraction, we demonstrate the manipulation of the picosecond strain response of a metallic heterostructure consisting of a dysprosium (Dy) transducer and a niobium (Nb) detection layer by an external magnetic field. We utilize the first-order ferromagnetic-antiferromagnetic phase transition of the Dy layer, which provides an additional large contractive stress upon laser excitation compared to its zerofield response. This enhances the laser-induced contraction of the transducer and changes the shape of the picosecond strain pulses driven in Dy and detected within the buried Nb layer. Based on our experiment with rare-earth metals we discuss required properties for functional transducers, which may allow for novel field-control of the emitted picosecond strain pulses.},
  language  = {en}
}
@misc{MatternPudellDumesniletal.2023,
  author    = {Mattern, Maximilian and Pudell, Jan-Etienne and Dumesnil, Karine and von Reppert, Alexander and Bargheer, Matias},
  title     = {Towards shaping picosecond strain pulses via magnetostrictive transducers},
  series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {1321},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-58886},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-588868},
  pages     = {7},
  year      = {2023},
  abstract  = {Using time-resolved x-ray diffraction, we demonstrate the manipulation of the picosecond strain response of a metallic heterostructure consisting of a dysprosium (Dy) transducer and a niobium (Nb) detection layer by an external magnetic field. We utilize the first-order ferromagnetic-antiferromagnetic phase transition of the Dy layer, which provides an additional large contractive stress upon laser excitation compared to its zerofield response. This enhances the laser-induced contraction of the transducer and changes the shape of the picosecond strain pulses driven in Dy and detected within the buried Nb layer. Based on our experiment with rare-earth metals we discuss required properties for functional transducers, which may allow for novel field-control of the emitted picosecond strain pulses.},
  language  = {en}
}
@article{vonReppertMatternPudelletal.2020,
  author    = {von Reppert, Alexander and Mattern, Maximilian and Pudell, Jan-Etienne and Zeuschner, Steffen Peer and Dumesnil, Karine and Bargheer, Matias},
  title     = {Unconventional picosecond strain pulses resulting from the saturation of magnetic stress within a photoexcited rare earth layer},
  series = {Structural Dynamics},
  volume    = {7},
  journal   = {Structural Dynamics},
  number    = {024303},
  publisher = {AIP Publishing LLC},
  address   = {Melville, NY},
  issn      = {2329-7778},
  doi       = {10.1063/1.5145315},
  pages     = {13},
  year      = {2020},
  abstract  = {Optical excitation of spin-ordered rare earth metals triggers a complex response of the crystal lattice since expansive stresses from electron and phonon excitations compete with a contractive stress induced by spin disorder. Using ultrafast x-ray diffraction experiments, we study the layer specific strain response of a dysprosium film within a metallic heterostructure upon femtosecond laser-excitation. The elastic and diffusive transport of energy to an adjacent, non-excited detection layer clearly separates the contributions of strain pulses and thermal excitations in the time domain. We find that energy transfer processes to magnetic excitations significantly modify the observed conventional bipolar strain wave into a unipolar pulse. By modeling the spin system as a saturable energy reservoir that generates substantial contractive stress on ultrafast timescales, we can reproduce the observed strain response and estimate the time- and space dependent magnetic stress. The saturation of the magnetic stress contribution yields a non-monotonous total stress within the nanolayer, which leads to unconventional picosecond strain pulses.},
  language  = {en}
}
@misc{vonReppertMatternPudelletal.2020,
  author    = {von Reppert, Alexander and Mattern, Maximilian and Pudell, Jan-Etienne and Zeuschner, Steffen Peer and Dumesnil, Karine and Bargheer, Matias},
  title     = {Unconventional picosecond strain pulses resulting from the saturation of magnetic stress within a photoexcited rare earth layer},
  series = {Postprints der Universit{\"a}t Potsdam : Mathematisch Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Mathematisch Naturwissenschaftliche Reihe},
  number    = {899},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-46935},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-469350},
  pages     = {15},
  year      = {2020},
  abstract  = {Optical excitation of spin-ordered rare earth metals triggers a complex response of the crystal lattice since expansive stresses from electron and phonon excitations compete with a contractive stress induced by spin disorder. Using ultrafast x-ray diffraction experiments, we study the layer specific strain response of a dysprosium film within a metallic heterostructure upon femtosecond laser-excitation. The elastic and diffusive transport of energy to an adjacent, non-excited detection layer clearly separates the contributions of strain pulses and thermal excitations in the time domain. We find that energy transfer processes to magnetic excitations significantly modify the observed conventional bipolar strain wave into a unipolar pulse. By modeling the spin system as a saturable energy reservoir that generates substantial contractive stress on ultrafast timescales, we can reproduce the observed strain response and estimate the time- and space dependent magnetic stress. The saturation of the magnetic stress contribution yields a non-monotonous total stress within the nanolayer, which leads to unconventional picosecond strain pulses.},
  language  = {en}
}
@article{MatternvonReppertZeuschneretal.2022,
  author    = {Mattern, Maximilian and von Reppert, Alexander and Zeuschner, Steffen Peer and Pudell, Jan-Etienne and K{\"u}hne, F. and Diesing, Detlef and Herzog, Marc and Bargheer, Matias},
  title     = {Electronic energy transport in nanoscale Au/Fe hetero-structures in the perspective of ultrafast lattice dynamics},
  series = {Applied physics letters},
  volume    = {120},
  journal   = {Applied physics letters},
  number    = {9},
  publisher = {AIP Publishing},
  address   = {Melville},
  issn      = {0003-6951},
  doi       = {10.1063/5.0080378},
  pages     = {5},
  year      = {2022},
  abstract  = {We study the ultrafast electronic transport of energy in a photoexcited nanoscale Au/Fe hetero-structure by modeling the spatiotemporal profile of energy densities that drives transient strain, which we quantify by femtosecond x-ray diffraction. This flow of energy is relevant for intrinsic demagnetization and ultrafast spin transport. We measured lattice strain for different Fe layer thicknesses ranging from few atomic layers to several nanometers and modeled the spatiotemporal flow of energy densities. The combination of a high electron-phonon coupling coefficient and a large Sommerfeld constant in Fe is found to yield electronic transfer of nearly all energy from Au to Fe within the first hundreds of femtoseconds.},
  language  = {en}
}