[HTML][HTML] Concepts and use cases for picosecond ultrasonics with x-rays

M Mattern, A von Reppert, SP Zeuschner, M Herzog… - Photoacoustics, 2023 - Elsevier
This review discusses picosecond ultrasonics experiments using ultrashort hard x-ray probe
pulses to extract the transient strain response of laser-excited nanoscopic structures from …

Localized Excited Charge Carriers Generate Ultrafast Inhomogeneous Strain in the Multiferroic

D Schick, M Herzog, H Wen, P Chen, C Adamo, P Gaal… - Physical review …, 2014 - APS
We apply ultrafast x-ray diffraction with femtosecond temporal resolution to monitor the
lattice dynamics in a thin film of multiferroic BiFeO 3 after above-band-gap photoexcitation …

Spin stress contribution to the lattice dynamics of FePt

A von Reppert, L Willig, JE Pudell, SP Zeuschner… - Science …, 2020 - science.org
Invar-behavior occurring in many magnetic materials has long been of interest to materials
science. Here, we show not only invar behavior of a continuous film of FePt but also even …

Heat transport without heating?—An ultrafast X‐ray perspective into a metal heterostructure

JE Pudell, M Mattern, M Hehn… - Advanced Functional …, 2020 - Wiley Online Library
When the spatial dimensions of metallic heterostructures shrink below the mean free path of
its conduction electrons, the transport of electrons and hence the transport of thermal energy …

Ultrafast lattice response of photoexcited thin films studied by X-ray diffraction

D Schick, M Herzog, A Bojahr, W Leitenberger… - Structural …, 2014 - pubs.aip.org
Using ultrafast X-ray diffraction, we study the coherent picosecond lattice dynamics of
photoexcited thin films in the two limiting cases, where the photoinduced stress profile …

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

J Pudell, AA Maznev, M Herzog, M Kronseder… - Nature …, 2018 - nature.com
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 …

Phonon‐Dominated Energy Transport in Purely Metallic Heterostructures

M Herzog, A von Reppert, JE Pudell… - Advanced Functional …, 2022 - Wiley Online Library
Ultrafast X‐ray diffraction is used to quantify the transport of energy in laser‐excited
nanoscale gold–nickel (Au–Ni) bilayers. Electron transport and efficient electron–phonon …

[HTML][HTML] Reciprocal space slicing: A time-efficient approach to femtosecond x-ray diffraction

SP Zeuschner, M Mattern, JE Pudell… - Structural …, 2021 - pubs.aip.org
An experimental technique that allows faster assessment of out-of-plane strain dynamics of
thin film heterostructures via x-ray diffraction is presented. In contrast to conventional high …

[HTML][HTML] Analysis of the temperature-and fluence-dependent magnetic stress in laser-excited SrRuO3

M Mattern, JE Pudell, G Laskin, A von Reppert… - Structural …, 2021 - pubs.aip.org
We use ultrafast x-ray diffraction to investigate the effect of expansive phononic and
contractive magnetic stress driving the picosecond strain response of a metallic perovskite …

[HTML][HTML] Ultrafast laser generated strain in granular and continuous FePt thin films

A von Reppert, L Willig, JE Pudell, M Rössle… - Applied Physics …, 2018 - pubs.aip.org
We employ ultrafast X-ray diffraction to compare the lattice dynamics of laser-excited
continuous and granular FePt films on MgO (100) substrates. Contrary to recent results on …