Module 6: Magnetic Ceramics
  Magnetic Ferrites
 


6.11.4 Properties of Ferrite Ceramics

As discussed above, ferrites can have a broad spectrum of properties depending upon the type of ferrite and compositions. The following table shows some properties of common magnetic ceramics. These values are quite dependent upon the microstructure and processing history of the material. For comparison, values for some common magnetic metals and alloys are also given (Source: Electroceramics, AJ Moulson and JM Herbert, Wiley):

Material

Magnetic permeability,

 

Coercive Field
(Hc, A.m-)

Remanence
(Bs, T)

Curie temperature (Tc, °C)

Resistivity

Soft materials

Fe

150

80

2.16

770

10×10-8 

Fe-4%Si

2000

30

1.93

690

60×10-8 

Mn-Zn ferrites

500-10,000

5-100

0.35-0.50

90-280

0.01-1

Ni-Zn ferrites

10-2000

15-1600

0.10-0.40

90-500

103-107 

Hard materials

Medium Carbon steel

 

4.4

0.9

770

 

Isotropic Barium Hexaferrite

 

200

0.3

450

 

Oriented Barium Hexaferrite

 

320

0.4

450