Yves Marc Acremann


Last Name

Acremann

First Name

Yves Marc

ORCID

0000-0002-4109-3544

Organisational unit

03815 - Vaterlaus, Andreas / Vaterlaus, Andreas

Search Results

Publications 1 - 10 of 53
  • Observations of laser induced magnetization dynamics in Co/Pd multilayers with coherent x-ray scattering
    Item type: Journal Article
    Wu, B.; Zhu, D.; Acremann, Yves Marc; et al. (2011)
    Applied Physics Letters
  • Introducing ultrafast EBIC: Spatially resolved transient analysis of an avalanche photodiode
    Item type: Journal Article
    Rehmann, Joel; Röllin, Matthias; Vaterlaus, Andreas; et al. (2025)
    Applied Physics Letters
    We present ultrafast electron-beam-induced current (EBIC) measurements using an ultrafast scanning electron microscope (USEM) to investigate picosecond-scale transient behavior in semiconductor devices. This pump–probe technique enables spatially resolved observations of electric field dynamics at the micrometer to nanometer scale. We demonstrate this approach through a transient analysis of a dynamically biased avalanche photodiode (APD). Experimental results, supported by an equivalent circuit model, reveal that the gain dynamics under pulsed reverse bias are governed by the device's voltage-dependent capacitance. Furthermore, the radial dependence of the transient response highlights the ability of the method to resolve spatial variations in carrier dynamics. This technique offers insights into carrier transport, electric field distributions, and transient phenomena in a wide range of electronic and optoelectronic devices.
  • X-ray spectroscopy of current-induced spin-orbit torques and spin accumulation in Pt/3d-transition-metal bilayers
    Item type: Journal Article
    Stamm, Christian; Murer, Christoph; Acremann, Yves Marc; et al. (2019)
    Physical Review B
  • Tracking the surface atomic motion in a coherent phonon oscillation
    Item type: Journal Article
    Curcio, Davide; Volckaert, Klara; Kutnyakhov, Dmytro; et al. (2022)
    Physical Review B
    X-ray photoelectron diffraction is a powerful tool for determining the structure of clean and adsorbate-covered surfaces. Extending the technique into the ultrafast time domain will open the door to studies as diverse as the direct determination of the electron-phonon coupling strength in solids and the mapping of atomic motion in surface chemical reactions. Here we demonstrate time-resolved photoelectron diffraction using ultrashort soft x-ray pulses from the free electron laser FLASH. We collect Se 3d photoelectron diffraction patterns over a wide angular range from optically excited Bi2Se3 with a time resolution of 140 fs. Combining these with multiple scattering simulations allows us to track the motion of near-surface atoms within the first 3 ps after triggering a coherent vibration of the A1g optical phonons. Using a fluence of 4.2mJ/cm2 from a 1.55 eV pump laser, we find the resulting coherent vibrational amplitude in the first two interlayer spacings to be on the order of 0.01 Å.
  • Spatially and time-resolved magnetization dynamics driven by spin-orbit torques
    Item type: Journal Article
    Baumgartner, Manuel; Garello, Kevin; Mendil, Johannes; et al. (2017)
    Nature Nanotechnology
  • Nonuniform switching of the perpendicular magnetization in a spin-torque-driven magnetic nanopillar
    Item type: Journal Article
    Bernstein, David P.; Braeuer, Bjoern; Kukreja, Roopali; et al. (2011)
    Physical Review B
  • A time distribution system for single-shot experiments in the laboratory
    Item type: Journal Article
    Hecht, Linos; Ussling, Carl Frederic; Bozzini, Jingo; et al. (2025)
    Review of Scientific Instruments
    Amplified femtosecond laser systems offer sufficient pulse energy to study light-matter interaction with single-shot single-particle experiments. However, such event-based experimental approaches require combining multiple detectors that are read out for each individual laser pulse while preserving time synchronization. Consequently, it is crucial to reliably assign the recorded data from separate detectors to the same laser pulse. Here, we report on developing and implementing a time distribution system for a laboratory environment that adds a unique laser pulse identification number to the data stream of various detectors. In addition, it provides configurable low-jitter trigger pulses, which are distributed along the setup.
  • Magnetic field generation with local current injection
    Item type: Journal Article
    Michlmayr, T.; Saratz, N.; Ramsperger, U.; et al. (2008)
    Journal of Physics D: Applied Physics
  • Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo
    Item type: Journal Article
    Graves, C. E.; Reid, A. H.; Wang, T.; et al. (2013)
    Nature Materials
  • 4D texture of circular dichroism in soft-x-ray photoemission from tungsten
    Item type: Journal Article
    Fedchenko, Olena; Medjanik, Katerina; Chernov, Sergey; et al. (2019)
    New Journal of Physics
    Photoemission-intensity distributions I RCP/LCP (E B , k ) measured for right- and left-circularly polarized soft x-rays revealed a large circular dichroism in angular distribution (CDAD) in the 4D parameter space (E B binding energy, k momentum vector). Full-field k-imaging combined with time-of-flight energy recording at a high-brilliance soft x-ray beamline allowed mapping the CDAD in the bulk Brillouin zone of tungsten and the entire d-band complex within a few hours. CDAD-asymmetries are very high (up to 90%), persist throughout the whole photon-energy range (300–1300 eV) and show a pronounced dependence on momentum k and binding energy E B, visualized as movies or sequences of cuts through the 4D object. One-step photoemission calculations for the same photon energies show fair agreement with the measured results. In addition to the requirement of a 'handed' experimental geometry, known from previous experiments on adsorbates and surface states, we find an anti-symmetric behavior of the CDAD with respect to two bulk mirror planes. A new symmetry condition along the perpendicular momentum kz makes CDAD a valuable tool for an unambiguous identification of high-symmetry planes in direct transitions in the periodic zone scheme. Technically, the method provides a circular polarimeter for soft, tender and hard x-rays.
Publications 1 - 10 of 53