Magnetic susceptibility of powder and single-crystal TmFeO3 orthoferrite

This paper presents the results of magnetic susceptibility investigations c arried out on TmFeO3 samples, both single crystal and powder. It is shown t hat powder specimens exhibit a pronounced magnetic thermoremanence effect. This effect can be employed to determine phase transition temperatures from susceptibility measurements performed on polycrystalline substances. Until now, these temperatures had been obtained only from examining the spontane ous magnetisation of single-crystal specimens. The spin reorientation tempe ratures obtained from various measurements are compared. (C) 2000 Elsevier Science B.V. All rights reserved.