Marcin Bialek (Ecole Polytechnique Fédérale de Lausanne)
We study coupling of electromagnetic waves to magnetization dynamics. Magnon-polaritons are intensively explored in ferromagnetic materials at gigahertz frequencies. Antiferromagnets have resonance frequencies at in the terahertz band, thus, there are only a few reports of light-matter coupling in that case. We report strong magnon-photon coupling in hematite alpha-Fe2O3. A cube of hematite was placed inside a cavity that has a resonance at 0.24 THz. Our transmission data as function of temperature show very clear avoided crossing of the first cavity mode and the antiferromagnetic resonance of a cooperativity factor of 40.
M. Bialek et al, Phys. Rev. Applied 15, 044018 (2021)
Marcin Bialek (Ecole Polytechnique Fédérale de Lausanne) Mr Jianyu Zhang (Beihang University, Beijing) Prof. Haiming Yu (Beihang University, Beijing) Prof. Jean-Philippe Ansermet (EPFL)