Magnetic Properties of Sm-Nd-Fe-Co-N Compounds and Their Bonded Magnets

Experiments were carried out to investigate the magnetic and physical properties of (Sm
_1-x
Nd
_x
)
₂
(Fe
_0.8
Co
_0.2
)
₁₇
N
_y
(x=0 to 0.5) in which the value of y is 3. The anisotropy field (H
_A
) in (Sm
_1-x
Nd
_x
)
₂
(Fe
_0.8
Co
_0.2
)
₁₇
N
_y
compounds decreased linearly with increasing x, while the saturation magnetization (J
_s
) increased. It was found that the H
_A
and J
_s
of a (Sm
_0.9
Nd
_0.1
)
₂
(Fe
_0.8
Co
_0.2
)
₁₇
N
_3.07
compound were 10.4 MA/m and 193.6×10
^-6
Wb-m/kg respectively. Anisotropic epoxy-bonded magnets were prepared from (Sm
_0.9
Nd
_0.1
)
₂
(Fe
_0.8
Co
_0.2
)
₁₇
N
_3.07
powder with particle size ranging from 3 to 5 μm by a compression molding process. The magnetic properties of a typical bonded magnet were (BH)
_max
=101.8 kJ/m
³
, J
_r
=0.89 T, H
_cJ
=394 kA/m, and H
_cB
=314 kA/m. Magnetization jumps were observed on the hysteresis loop of a bonded magnet at 7K.