Magnetization and magnetic anisotropy of TbFe2, DyFe2, Tb0.27Dy0.73Fe2and TmFe2

Saturation magnetizations were measured on single crystals of TbFe
2
, DyFe
2
, Tb
0.27
Dy
0.73
Fe
2
and TmFe
2
. Over most of the temperature rang from 4 K to 300 K, these values are substantially larger than those measured earlier on polycrystals. The intrinsic magnetic anisotropies, K
1
(0)'s, as determined from magnetic fields required for saturation, are huge (
\sim5 \times 10^{8}
erg/ cm
³
). For these highly magnetostrictive compounds, the magnetoelastic contribution to the anisotropy
-\frac{1}{2}c_{44}\lambda\min{111}\max{2}
is a significant fraction of the total anisotropy.