论文信息 - The magnetic properties of NiF2

The magnetic properties of NiF2

Measurements have been made of the magnetic properties of a single crystal of NiF2, both above and below its Neel temperature. Below TN the magnetic moment along the appropriate crystal axis contains two contributions. One of these is associated with χ⊥ of an antiferromagnet and is linear with field and independent of temperature. The other contribution approaches a saturation moment which is temperature dependent and is ferromagnetic in nature. Immediately above TN the paramagnetic susceptibility along the same axis becomes very large as TN is approached, which is unusual in a substance undergoing a transition to the antiferromagnetic state but can be understood in the light of the weak ferromagnetic properties of NiF2 below TN. These and previous results show that in the ordered state the spins are almost antiparallel in a plane perpendicular to the tetragonal axis, but are tilted away from the antiparallel position in such a way that the crystal acquires a ferromagnetic moment in the same plane perpendicular to the axis of antiferromagnetic ordering.

A. H. Cooke | R. Lazenby | K. Gehring

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