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30 July 2024 Temperature dependence of THz transients generated by FeCo/graphene nanobilayers excited by femtosecond optical laser pulses
Ivan V. Komissarov, Jing Cheng, Iraida N. Demchenko, Kostiantyn Nikiforow, Debamitra Chakraborty, Leszek Gladczuk, Roman Adam, Daniel E. Bürgler, Claus M. Michael Schneider, Serghej L. Prischepa, Roman Sobolewski
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Proceedings Volume PC12994, Terahertz Photonics III; PC1299409 (2024) https://doi.org/10.1117/12.3021806
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
In this work, we performed temperature-dependent studies of the THz transient amplitude FeCo waveformes, from a FeCo/graphene nanobilayer sample, triggered by fs pulsed laser in the 80–400 K range. We show that a due-twofold extension, in the range 80–300 K the amplitude increases with temperature and tends to saturate above this range. This dependence contrasts sharply with the temperature dependence of the FeCo film's magnetization, which shows a typical ferromagnetic (FM) trend with Curie temperature well above 400 K. We explain this discrepancy, as the presence of an antiferromagnetic (AFM) at the FeCo/graphene interface, which is associated with the native oxide formed at the FeCo surface. The Angle Resolved X-ray Photoelectron Spectroscopy studies of a bare FeCo film revealed coexistence of the metallic [Co(0), Fe(0)] and antiferromagnetic [Co(II)O and the Fe(III)2O3] phases, at the sample surface. The observation of the exchange bias in our magnetization hysteresis loop of a FeCo film confirms presence of an FM/AFM interface layer at the FeCo surface. In summary, we conclude that the temperature dependence of the THz transient amplitude is governed by the AFM phase.
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Ivan V. Komissarov, Jing Cheng, Iraida N. Demchenko, Kostiantyn Nikiforow, Debamitra Chakraborty, Leszek Gladczuk, Roman Adam, Daniel E. Bürgler, Claus M. Michael Schneider, Serghej L. Prischepa, and Roman Sobolewski "Temperature dependence of THz transients generated by FeCo/graphene nanobilayers excited by femtosecond optical laser pulses", Proc. SPIE PC12994, Terahertz Photonics III, PC1299409 (30 July 2024); https://doi.org/10.1117/12.3021806
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KEYWORDS
Terahertz radiation
Laser optics
Femtosecond phenomena
Femtosecond pulse shaping
Interfaces
Graphene
Temperature metrology
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