Magnetic properties of single crystal Nd1-xSmxCo5alloys

The magnetic properties of the pseudo-binary alloy system Nd
1-x
Sm
x
Co
5
were investigated to determine the compositional dependence of the anisotropy constants and the saturation magnetization. The anisotropy constants K
1
and K
2
of the alloy system were not linearly dependent on composition, suggesting that the single-ion model of anisotropy is not applicable for this System. The deviation from linear behavior could be fitted to an equation from sub-regular solution theory, giving K
1
=-67×10
⁷
+96×10
⁷
x+6×10
⁷
x
²
(1-x)+ 108×10
⁷
x(1-x)
²
ergs/cm
³
and K
1
=35×10
⁷
-35×10
⁷
x+43×10
⁷
x
²
(1-x)-104×10
⁷
x(1-x)
²
ergs/cm
³
at 4.2°K. However, the magnetization was found to be linearly dependent on composition in this system and is given by M
s
(0)=1122-145.9x emu/cm
³
.