Abstract
Abstract The use of zero and applied field Mossbauer spectroscopy in the study of ferromagnetic interactions in the solid state is reviewed. The angular intensity factors relevant to magnetic hyperfine splitting and cooperative magnetic ordering for the I = ½ → I = 3-2; transition of Iron-57 are presented. The following examples are then considered: (a) very strong ferromagnetic interactions in metallic α-iron, (T critical) − 1043K, (b) very weak ferromagnetic interactions, T (critical) − 1K, for ionic fluorides of high spin iron III, (c) studies of highly anisotropic 1D chain metamagnets with direct spectroscopic observation of magnetization of ferromagnetic chains in small external fields, and finally (d) slow paramagnetic relaxation and ferromagnetism in dimers based on the low-spin iron III (spin doublet) centers of decamethylferrocenium units.
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