Abstract
Pure phase Sr3Fe2F12 powders were prepared by solid state reaction, which has been confirmed by the X-ray diffraction pattern. The morphology was studied by scanning electron microscope which shows the layered growth. The Fe ions are in +3 valence state from X-ray photoelectron spectroscopy. Two kinks can be observed from temperature dependent magnetization measurements, suggesting two antiferromagnetic transitions. A bifurcation between field cooling and zero field cooling temperature dependent magnetization curves happens below Néel temperature (TN1) of 47 K, suggesting a magnetic relax system. The field dependent magnetization curves show clear hysteresis below TN1, indicating the occurrence of weak ferromagnetism. This is related to the spin canting due to the Dzyaloshinskii-Moriya (DM) interaction. The two antiferromagnetic transitions with magnetic relaxation below TN1 are related to the complicated arrangements of FeF6 octahedra, leading to the complicated exchange interaction between Fe3+ ions.
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