Monitoring laser-induced magnetization in FeRh by transient terahertz emission spectroscopy

In this study, a conceptually different approach for investigating magnetic phase transitions in ultra-thin films is presented. THz emission from a laser-excited material is used to monitor the magnetization dynamics during the laser-driven antiferromagnetic to ferromagnetic transition in FeRh. The...

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Bibliographic Details
Published in:Applied physics letters 2020-09, Vol.117 (12)
Main Authors: Awari, N., Semisalova, A., Deinert, J.-C., Lenz, K., Lindner, J., Fullerton, E., Uhlíř, V., Li, J., Clemens, B., Carley, R., Scherz, A., Kovalev, S., Gensch, M.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Applied physics
Dichroism
Emission analysis
Ferromagnetism
Kerr effects
Kerr magnetooptical effect
Lasers
Magnetic measurement
Magnetic moments
Magnetism
Magnetization
Phase transitions
Thin films
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Summary:In this study, a conceptually different approach for investigating magnetic phase transitions in ultra-thin films is presented. THz emission from a laser-excited material is used to monitor the magnetization dynamics during the laser-driven antiferromagnetic to ferromagnetic transition in FeRh. The emitted THz signal is calibrated against static magnetometry data measurements, giving a direct measure of the absolute magnetic moment of the sample on the sub-picosecond timescale. The technique is, therefore, highly complementary to conventional time-resolved experiments such as time resolved magneto-optic Kerr effect (MOKE) or x-ray magnetic circular dichroism.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0019663