Abstract
NiBr2 is a multiferroic material with an incommensurate magnetic ground state that has easy-plane anisotropy. This manuscript reports how the magnetic properties evolve with Fe substitution in Ni1−xFexBr2 single crystals for 0 ≤x≤ 0.17. A particular emphasis is placed on the x = 0.055 crystal, for which Hvs.T magnetic phase diagrams were developed on the basis of anisotropic magnetization measurements. The observed phase evolution reveals a phase transition in the x = 0.055 crystal that is not present in NiBr2. The data also demonstrate that the easy-plane anisotropy of NiBr2 is altered by Fe substitution, with a finite easy-axis anisotropy developing at even the low concentration of x = 0.055. These results demonstrate that Fe substitution enables a fine-tuning of the magnetism in NiBr2, especially the magnetic anisotropy, and may therefore promote complex magnetic phases.
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