High-Curie-Temperature Ferromagnetism in (Sc,Fe)F3 Fluorides and its Dependence on Chemical Valence.

Hu, Lei; Chen, Jun; Fan, Longlong; Ren, Yang; Huang, Qingzhen; Sanson, Andrea; Jiang, Zheng; Zhou, Mei et al. · Adv Mater · 2015

basic_science · Level V

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Abstract

A magnetic metal-fluoride system is shown for the first time to have a high Curie temperature (≈545 K). The magnetism correlates intimately with the Fe(2+)/Fe(3+) ratio. As the ratio increases, the weak magnetism displayed by unordered magnetic moments intensifies, and these magnetic moments align in parallel. Simultaneously, a magneto-volume effect is also shown to increase the lattice volume.