MAGNETIC STUDIES OF THE ANTIFERROMAGNET RBMNF3
Abstract
Magnetic properties of the antiferromagnet RbMnF3 were studied. Below T sub N, the magnetic ions order into a two-sublattice system with the spins antiparallel. RbMnF3 exhibits high exchange and low anisotropy; the form of the anisotropy surface is cubic. Consequently, for applied DC magnetic fields less than about 3000 oe, the static equilibrium position of the sublattice magnetization is, in general, multivalued. Measurements of the DC susceptibility chi were made on powder and single crystal specimens of RbMnF3 for the range of applied field 0 to 12 koe and over the temperature range 4.2 to 300K. The observed value of T sub N was about ten degrees higher than the previously published value. When plotted as a function of applied field, chi sub(111) shows no abrupt discontinuity analogous to the spin flopping exhibited by uniaxial antiferromagnets. A simple model, in which H sub DC and M are restricted to the (110) plane, has enabled solutions of the static equilibrium problem to be obtained. X-band resonance experiments are reported, and a resonance theory is presented which incorporates the equilibrium solutions. The predicted antiferromagnetic resonance spectrum shows reasonable agreement with the experimental data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 14, 1965
- Accession Number
- AD0629429
Entities
People
- W. J. Ince
Organizations
- Massachusetts Institute of Technology