摘要
The structure and intrinsic magnetic properties of RFeM(M=V or Ti),type 1:12,have been studied by magnetic measurement and X-ray diffraction.They are body-centered tetragonal ThMn_(12)structure.The changes of crystal lattice constants coincide with that of their element radii.Curie temperature is decided mainly by the exchange interactions of 3d-3d and 3d-4f atom pairs.The data obtained by mean-field approximation agree well with experimental values.The magnetic moment coupling in these compounds for LRE is ferromagnetic,and for HRE is antiferromagnetic.At low temperature,anisotropy field is decided by RE sublattice.In this paper,the influence of magnetic properties of cobalt and nickel replacing iron has also been studied.
The structure and intrinsic magnetic properties of RFeM(M=V or Ti),type 1:12,have been studied by magnetic measurement and X-ray diffraction.They are body-centered tetragonal ThMn_(12)structure.The changes of crystal lattice constants coincide with that of their element radii.Curie temperature is decided mainly by the exchange interactions of 3d-3d and 3d-4f atom pairs.The data obtained by mean-field approximation agree well with experimental values.The magnetic moment coupling in these compounds for LRE is ferromagnetic,and for HRE is antiferromagnetic.At low temperature,anisotropy field is decided by RE sublattice.In this paper,the influence of magnetic properties of cobalt and nickel replacing iron has also been studied.
基金
This work is supported in part by the Magnetics Open Laboratory of Academia Sinica.
