Journal Article

PUBDB-2022-01704

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigating Coherent Magnetization Control with Ultrashort THz Pulses

Liu, X. ; Jal, E.Extern* ; Delaunay, R.Extern* ; Jarrier, R.Extern* ; Chiuzbaian, G. S.Extern* ; Malinowski, G. ; Golz, T.DESY* ; Zapolnova, E.DESY* ; Pan, R.DESY* ; Stojanovic, N.DESY* ; Luning, J.Extern* ; Vodungbo, B. (Corresponding author)Extern*

2022
MDPI Basel

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Please use a persistent id in citations: doi:10.3390/app12031323  doi:10.3204/PUBDB-2022-01704

Abstract: Coherent terahertz control of magnetization dynamics is an area of current interest due toits great potential for the realization of magnetization control on ultrafast timescales in commercialdevices. Here we report on an experiment realized at the THz beamline of the free electron laserFLASH at DESY which offers a tunable terahertz radiation source and spontaneously synchronizedfree-electron laser X-ray pulses to resonantly probe the magnetization state of a ferromagneticfilm. In this proof-of-principle experiment, we have excited a thin Permalloy film at different THzwavelengths and recorded the induced magnetization dynamics with photons resonantly tuned to theNi M2,3 absorption edge. For THz pump pulses including higher orders of the undulator source weobserved demagnetization dynamics, which precise shape depended on the employed fundamentalwavelength of the undulator source. Analyzing the shape in detail, we can reconstruct the temporalprofile of the electric field of the THz pump pulse. This offers a new method for the realization of anin-situ terahertz beamline diagnostic which will help researchers to adjust the pulse characteristics asneeded, for example, for future studies of THz induced coherent control of magnetization dynamics.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASH Beamline BL3 (FLASH)
2. FLASH THz Undulator Beamline (FLASH)

Appears in the scientific report 2022

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