Origin of the Magnetic Hyperfine Field Transferred at Iodine in Ferromagnetic CrI sub 3

摘要

exp 129 I Moessbauer spectroscopy has been performed in the ferromagnetic phase of CrI sub 3 in the presence of an external magnetic field. The reorientation of the microcrystals along the applied field has been observed for a loose powder sample and is in agreement with the high magnetic anisotropy of CrI sub 3 . The magnetic hyperfine interaction transferred at the iodine nucleus through covalency and overlap effects has been interpreted in terms of an anisotropic component arising from the presence of a finite spin density in the 5p iodine orbitals and a negative isotropic component originating from the exchange polarized 5s orbital of iodine or/and the core polarization by the unpaired 5p electrons. The relative importance of the several contributions to the transferred field is discussed. (Atomindex citation 10:458155)