Giant intrinsic magnetic hardness in RFe5−x Ni x (R=rare earth,x=4 to 5)
Tóm tắt
Giant low temperature intrinsic magnetic hardness is observed in structurally homogeneous CaCu5 type compounds RFe5−x
Ni
x
. In SmFe5−x
Ni
x
, this magnetic hardness peaks approximately at a composition SmFe0.2Ni4.8, with an extrapolated coercive force of 230 kOe at absolute zero. The transition metal sublattice is not anisotropic. Thus, the rare earth alone creates giant coercivity. Only compounds withc-axis preference exhibit substantial magnetic hardness (Sm, Er, Tm). Partial substitution of a tetravalent rare earth to produce crystal field anisotropy fluctuations apparently increases coercivity somewhat in the axis-preference compound SmFeNi4, but has no effect in the plane-preferred compound TbFeNi4.
Tài liệu tham khảo
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