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Strong coupling of electromagnetic cavity fields with antiferromagnetic spin waves in hematite (alpha-Fe2O3) is achieved above room temperature. A cube of hematite is placed in a metallic tube and the transmission is measured, using a continuous-wave terahertz spectrometer. The spectra, collected as a function of the temperature, reveal the formation of magnetic polaritons.
Tobias Kippenberg, Guanhao Huang, Nils Johan Engelsen, Alberto Beccari
Thomas Keller, Lulu Liu, Abdolvahid Movahedirad