Observation of magnon-polarons in a uniaxial antiferromagnetic insulator

Abstract

Magnon-polarons, a type of hybridized excitations between magnons and phonons, were first reported in yttrium iron garnet as anomalies in the spin Seebeck effect responses. Here we report an observation of antiferromagnetic (AFM) magnon-polarons in a uniaxial AFM insulator Cr2O3. Despite the relatively higher energy of magnon than that of the acoustic phonons, near the spin-flop transition of ~ 6 T, the left-handed magnon spectrum shifts downward to hybridize with the acoustic phonons to form AFM magnon-polarons, which can also be probed by the spin Seebeck effect. The spin Seebeck signal is founded to be enhanced due to the magnon-polarons at low temperatures.

References in corpus (11)

• Subterahertz spin pumping from an insulating antiferromagnet
• Magnon Polarons in the Spin Seebeck Effect
• Magnon-phonon interactions in magnetic insulators
• Coherent elastic excitation of spin waves
• Direct observation of magnon-phonon coupling in yttrium iron garnet
• Nonlocal magnon-polaron transport in yttrium iron garnet
• Spontaneous decays of magneto-elastic excitations in noncollinear antiferromagnet (Y,Lu)MnO3
• Magnon polarons in the spin Peltier effect
• Magnon-polarons in cubic collinear Antiferromagnets
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Spin Seebeck effect from antiferromagnetic magnons and critical spin fluctuations in epitaxial FeF2 films

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• Cryogenic spin Peltier effect detected by a RuO${}_2$-AlO${}_x$ on-chip microthermometer
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