Magnetic transformations in indium-substituted hexaferrites

It is shown by the Moessbauer spectroscopy technique that the hexaferrite BaIn3M is characterized by the presence of an angular magnetic-disorder structure which goes over to a noncollinear structure on lowering of temperature and application of a magnetic field. The anomalous magnetic properties of ferrites having such compositions (e.g. absence of saturation in strong magnetic fields) are due to this fact, since collinear structures are not observed even at helium temperatures