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arXiv · 2603.25878

Room-temperature antiferromagnetic resonance in NaMnAs

Jan Dzian·Stáňa Tázlarů·Ivan Mohelský·Florian Le Mardelé·Filip Chudoba·Jiří Volný·Jan Wyzula·Amit Pawbake·Simone Ritarossi·Riccardo Mazzarello·Philipp Ritzinger·Jakub Železný·Karel Výborný·Klára Uhlířová·Benoît Grémaud·Andrés Saúl·Clément Faugeras·Martin Veis·Milan Orlita
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Abstract

We report on antiferromagnetic resonance experiments in bulk tetragonal NaMnAs -- a room-temperature antiferromagnetic semiconductor. Our results corroborate previous ab initio studies, which propose that NaMnAs is an easy-axis antiferromagnet with the N\'eel vector oriented along the tetragonal axis. At $ B = 0 $, we find a single antiferromagnetic resonance line at 7 meV and associate it with a doubly degenerate ($ k = 0 $) magnon mode. Its energy softens considerably with increasing $ T $, but remains clearly visible in the data up to room temperature. From the experimental data, we estimate the single-ion anisotropy of the Mn ions in NaMnAs in the range 0.1-0.2 meV, a value that is relatively large compared to other manganese-based antiferromagnets.

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Jan Dzian, Stáňa Tázlarů, Ivan Mohelský, Florian Le Mardelé, Filip Chudoba, Jiří Volný, Jan Wyzula, Amit Pawbake, Simone Ritarossi, Riccardo Mazzarello, Philipp Ritzinger, Jakub Železný, Karel Výborný, Klára Uhlířová, Benoît Grémaud, Andrés Saúl, Clément Faugeras, Martin Veis, Milan Orlita. 2026-03-26. Room-temperature antiferromagnetic resonance in NaMnAs. https://doi.org/10.1103/q9xw-gc4m

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