Accelerating the Laser-Induced Phase Transition in Nanostructured FeRh via Plasmonic Absorption
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Date
2024-08-01
Authors
Mattern, Maximilian
Pudell, Jan Etienne
Arregi Uribeetxebarria, Jon Ander
Zlámal, Jakub
Kalousek, Radek
Uhlíř, Vojtěch
Rössle, Matti
Bargheer, Matias
0000-0002-7376-2757Advisor
Referee
Mark
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WILEY-V C H VERLAG GMBH
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Abstract
By ultrafast x-ray diffraction (UXRD), it is shown that the laser-induced magnetostructural phase transition in FeRh nanoislands proceeds faster and more complete than in continuous films. An intrinsic 8 ps timescale is observed for the nucleation of ferromagnetic (FM) domains in the optically excited fraction of both types of samples. For the continuous film, the substrate-near regions are not directly exposed to light and are only slowly transformed to the FM state after heating above the transition temperature via near-equilibrium heat transport. Numerical modeling of the absorption in the investigated nanoislands reveals a strong plasmonic contribution near the FeRh/MgO interface. The larger absorption and the optical excitation of the electrons in nearly the entire volume of the nanoislands enables a rapid phase transition throughout the entire volume at the intrinsic nucleation timescale. Nanostructuring FeRh thin films by solid state dewetting make the laser-induced antiferromagnetic to ferromagnetic phase transition more efficient and speed the switching up to the intrinsic timescale. Ultrafast x-ray diffraction experiments directly measure the structural order parameter averaged over the entire film. Finite element modeling reveals the enhanced plasmonic light absorption near the substrate as the crucial factor. image
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Citation
ADVANCED FUNCTIONAL MATERIALS. 2024, vol. 34, issue 32, 10 p.
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202313014
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202313014
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Peer-reviewed
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en
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Defence
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Creative Commons Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
http://creativecommons.org/licenses/by-nc/4.0/