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VOLUME 23 (1976) | ISSUE 3 | PAGE 148
Microwave energy absorption by thermal magnons in the layered antiferromagnet BaMnF4
An absorption effect linear in the power was observed at frequencies 75-80 GHz in a range of magnetic fields where magnons exist with a frequency equal to half the pump power frequency; this effect increases when the sample is heated and when the pump frequency approaches the ferromagnetic resonance of the high-frequency branch.