Abstract
The angular dependence of the antiferromagnetic resonance (AFMR) spectrum in barium manganese fluoride has been studied at 4.2 °K. The data reveal a splitting of one AFMR mode into two distinct modes as the applied static magnetic field is rotated away from the easy (b) axis in the (100) plane. No splitting is observed for magnetic fields in the (001) plane.This behavior has been explained using a two‐magnetic‐sublattice model which includes a Dzyaloshin‐sky‐Moriya (D‐M) field along the crystal a axis. This field causes a canting of the otherwise antiparallel sublattices producing a weak ferromagnetic moment along the c axis. This canting may be masked in static magnetization measurements by the presence of domains with oppositely directed weak moments. The AFMR frequency differs in these two types of domains when the static magnetic field has a component along the c axis. This frequency splitting offers a new and sensitive measure of the strength of the D‐M field.
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