Magnetic properties, magnetic structure and crystal field in equiatomic rare earth-magnesium compounds

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Abstract
The magnetic properties and magnetic structure of some equiatomic rare earth-magnesium compounds RMg (R=Tb, Dy, Ho, Er) have been investigated by magnetization measurements on single crystals and neutron diffraction. The magnetic structures are all different and intermediate between the ferromagnetic and antiferromagnetic (00 pi )-type structures. The magnetization anisotropy in high fields allows a determination of crystal field parameters. The fourth-order parameter A4(r4) is positive in RMg compounds contrary to isomorphous compounds with transition metals.