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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.

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Author:Steffen Zeuschner, Tymur Parpiiev, Thomas PezerilORCiD, Arnaud Hillion, Karine DumesnilORCiD, Abdelmadjid AnaneORCiD, Jan Etienne Pudell, Lisa Willig, Matthias RössleORCiDGND, Marc HerzogORCiDGND, Alexander von ReppertORCiD, Matias BargheerORCiDGND
Parent Title (English):Structural Dynamics
Publisher:AIP Publishing LLC
Place of publication:Melville, NY
Document Type:Article
Date of first Publication:2019/03/20
Year of Completion:2019
Release Date:2019/05/03
Tag:Bragg peak; Crystal lattices; Heterostructures; Lasers; Magnetism; Magnetooptical effects; Metal oxides; Phonons; Transition metals; Ultrafast X-ray diffraction
Funder:Universität Potsdam
Grant Number:PA 2019_25
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Peer Review:Referiert
Grantor:Publikationsfonds der Universität Potsdam
Publication Way:Open Access
Licence (German):License LogoCreative Commons - Namensnennung, 4.0 International
Notes extern:Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 706