AC Susceptibility Measurements in Some RTiFe11-xCox (R=Dy, Ho, Er) Compounds: Spin-Reorientation Behavior. (Reannouncement with New Availability Information).

摘要

The DyTiFe(sub 11-x)Co(sub x) (x = 0, 1, 3), HoTiFe(sub 11-x)co(sub x) (x = 0, 3) and ErTiFe(sub 11) compounds, all exhibiting the ThMn(sub 12)-type structure, were studied for their ac susceptibility in the temperature range 20-300 K. The Dy- and Ho-containing compounds exhibited spin reorientation from axial to cone to planar, or from axial to cone in the temperature range 250-50 K, as expected. In this structure Dy and Ho with negative second-order Stevens' coefficients (a sub j < 0) favor planar rare earth sublattice anisotropy, while Fe and Co sublattices favor uniaxial and planar anisotropies, respectively and would be in competition as a function of temperature. A spin-reorientation type of behavior was also observed in the ErTiFe(sub 11) compound near 50 K. This observation appears to imply that, in this compound, the higher-order crystal-field terms are important. The magnetization data revealed that in these systems the rare earth and transition metal sublattices coupled antiparallel, as is normally the case in the heavy rare-earth-transition-metal compounds.