42844
2019
2019
eng
9
2
6
article
AIP Publishing LLC
Melville, NY
1
2019-03-20
2019-03-20
--
Tracking picosecond strain pulses in heterostructures that exhibit giant magnetostriction
We combine ultrafast X-ray diffraction (UXRD) and time-resolved Magneto-Optical Kerr Effect (MOKE) measurements to monitor the strain pulses in laser-excited TbFe2/Nb heterostructures. Spatial separation of the Nb detection layer from the laser excitation region allows for a background-free characterization of the laser-generated strain pulses. We clearly observe symmetric bipolar strain pulses if the excited TbFe2 surface terminates the sample and a decomposition of the strain wavepacket into an asymmetric bipolar and a unipolar pulse, if a SiO2 glass capping layer covers the excited TbFe2 layer. The inverse magnetostriction of the temporally separated unipolar strain pulses in this sample leads to a MOKE signal that linearly depends on the strain pulse amplitude measured through UXRD. Linear chain model simulations accurately predict the timing and shape of UXRD and MOKE signals that are caused by the strain reflections from multiple interfaces in the heterostructure.
Structural Dynamics
10.1063/1.5084140
2329-7778
Universität Potsdam
PA 2019_25
1590.20
024302
<a href="http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-428457">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 706</a>
CC-BY - Namensnennung 4.0 International
Steffen Zeuschner
Tymur Parpiiev
Thomas Pezeril
Arnaud Hillion
Karine Dumesnil
Abdelmadjid Anane
Jan-Etienne Pudell
Lisa Willig
Matthias Rössle
Marc Herzog
Alexander von Reppert
Matias Bargheer
eng
uncontrolled
Heterostructures
eng
uncontrolled
Magnetooptical effects
eng
uncontrolled
Metal oxides
eng
uncontrolled
Crystal lattices
eng
uncontrolled
Transition metals
eng
uncontrolled
Magnetism
eng
uncontrolled
Ultrafast X-ray diffraction
eng
uncontrolled
Lasers
eng
uncontrolled
Bragg peak
eng
uncontrolled
Phonons
Physik
open_access
Mathematisch-Naturwissenschaftliche Fakultät
Referiert
Publikationsfonds der Universität Potsdam
Open Access
49731
2019
2019
eng
9352
9357
6
14
123
article
American Chemical Society
Washington
1
2019-03-11
2019-03-11
--
Scaling up nanoplasmon catalysis
Nanoscale heating by optical excitation of plasmonic nanoparticles offers a new perspective of controlling chemical reactions, where heat is not spatially uniform as in conventional macroscopic heating but strong temperature gradients exist around microscopic hot spots. In nanoplasmonics, metal particles act as a nanosource of light, heat, and energetic electrons driven by resonant excitation of their localized surface plasmon resonance. As an example of the coupling reaction of 4-nitrothiophenol into 4,4′-dimercaptoazobenzene, we show that besides the nanoscopic heat distribution at hot spots, the microscopic distribution of heat dictated by the spot size of the light focus also plays a crucial role in the design of plasmonic nanoreactors. Small sizes of laser spots enable high intensities to drive plasmon-assisted catalysis. This facilitates the observation of such reactions by surface-enhanced Raman scattering, but it challenges attempts to scale nanoplasmonic chemistry up to large areas, where the excess heat must be dissipated by one-dimensional heat transport.
The journal of physical chemistry : C, Nanomaterials and interfaces
the role of heat dissipation
10.1021/acs.jpcc.8b12574
1932-7447
wos:2019
WOS:000464768600097
Koopman, W (reprint author), Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany., koopman@uni-potsdam.de
DFG via the School of Analytical Science Adlershof (SALSA)
2021-03-04T07:27:04+00:00
sword
importub
filename=package.tar
cf0d01a047de935486f7cbb94d05f27e
Koopman, Wouter
false
true
Radwan Mohamed Sarhan
Wouter-Willem Adriaan Koopman
Jan-Etienne Pudell
Felix Stete
Matthias Rössle
Marc Herzog
Clemens Nikolaus Zeno Schmitt
Ferenc Liebig
Joachim Koetz
Matias Bargheer
eng
uncontrolled
Gold
eng
uncontrolled
Raman spectroscopy
eng
uncontrolled
Silicon
eng
uncontrolled
Irradiation
eng
uncontrolled
Lasers
Physik
Institut für Physik und Astronomie
Referiert
Import