Low-Temperature Antiferromagnetic Resonance in αFe2O3

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Abstract
Antiferromagnetic resonance (AFMR) at 35, 70, and 121 Gc/sec in single‐crystal synthetic and natural αFe2O3 from 4.2° to 280°K has been observed. The usual low‐field AFMR as well as the spin‐flop resonance mode are observed with pulsed magnetic fields applied parallel to the c axis. The data extend from well below the spin reorientation transition temperature TM (about −10°C) to well above TM. The spin‐flop mode joins smoothly with the canted high‐frequency mode above TM. The usual AFMR terminates abruptly at TM. The three modes observed here for the first time in αFe2O3 require either high fields or high frequencies or both for observation. The effects of the Dzyaloshinsky‐Moriya field HDM on the spin‐flop resonance, the usual AFMR, as well as possible effects of spontaneous sublattice magnetizations are discussed.