Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Ultrafast Magnetization Effects II
MA 48.4: Vortrag
Freitag, 21. März 2025, 12:00–12:15, H20
Terahertz study of antiferromagnetic resonance in α MnTe — •Michal Šindler1, Roman Tesař1, Karel Výborný1, Stáňa Tazlerů1, Christelle Kadlec1, Peter Kubaščík2, Lukáš Nádvorník2, Marcin Bialek3, Jan Dzian2,4, and Milan Orlita4 — 1Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic — 2Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 3Institute of High Pressure Physics Polish Academy of Sciences, Warszawa, Poland — 4Laboratoire National des Champs Magnétiques Intenses, Université Grenoble Alpes, CNRS-UPS-INSA-EMFL, Grenoble, France
Antiferromagnetic resonance in bulk α-MnTe crystal was studied in the terahertz (THz) range. First, we will describe the three experimental methods used: (i) infrared Fourier transform spectroscopy,(ii) time-domain THz spectroscopy, and (iii) frequency-domain terahertz spectroscopy with linearly and circularly polarized THz beams. Second, we will present experimental results featuring a magnon mode (k=0) with the low-temperature energy of 3.5 meV and its temperature and magnetic field evolution. Finally, we will show how to extract the out-of-plane component of the single-ion magnetic anisotropy D ≈ 40 µeV using a simple spin model of antiferromagnetic resonance in an easy-plane antiferromagnet.
Keywords: terahertz spectroscopy; antiferromagnet; magnons