Magnetostatic Modes in the Canted Antiferromagnet MnCO3

Abstract
We have discovered magnetostatic modes (Walker modes) in small spheres of the canted antiferromagnet MnCO3 at millimeter waves and have developed the theory for the individual modes of a sphere for which propagation effects may be neglected. This is the first time that such modes have been found in a pure or canted antiferromagnet.