They offer an excellent cost performance and are made mainly from Fe2O3(Iron Oxide) and BaCO3(Barium carbonate) or SrCO3(Strontium carbonate). These magnets are formed by power metallurgy. There are two types of magnet: the Isotropic magnet, molded in the absence of a magnetic field and the Anisotropic magnet, which has out standing properties in the direction of the field.
These two types magnets are also divided as wet and dry type by using water or not in producing. Dry process will be adopted when production of small size or small quantity is required because of the ease of tool change and the lower cost in developing toolings than wet process, even though it has a weak point of lower magnetic properties than those of wet.

 
- One Magnetic Direction
- Simple Shape, Big size
- High Tooling Charge
- High Price comparing as Isotropic Magnet
- Magnetic Property
.Residual Flux Density (Br) : 4,000 (G)
.Coercive Force (Hc) : 3,000 (Oe)
. Maximum Energy ((BH)max) : 4.0 MGOe
.Density (g/) : 4.6 ~ 5.1
- Many Magnetic direction
- Complex Shape, Small Size
- Low tooling Charge
- Low Price
- Magnetic Property
..Residual Flux Density (Br) : 2,100 (G)
.Coercive Force (Hc) : 2,000 (Oe)
.Maximum Energy ((BH)max) : 1.1 MGOe
.Density (g/) : 4.6 ~ 5.1
 

MATERIAL

REMANENCE

COERCIBITY

MAX. ENERGY PRODUCT

NOTE

 

Br(G)

bHc(Oe)

iHc(Oe)

(BH)max MGOe

MATERIAL

PROCESS

BA - 1

2200

1900

3300

1.1

ISOTROPIC Ba-FERRITE

DRY PRESS

SA - 1

2200

2000

3200

1.1

ISOTROPIC Sr-FERRITE

DRY PRESS

SR - 1

3700

2800

3000

3.2

ANISOTROPIC Sr-FERRITE

DRY PRESS

SR - 3

4000

2800

2850

4.0

ANISOTROPIC Sr-FERRITE

DRY PRESS

SR - 4H

3900

3500

3600

3.7

ANISOTROPIC Sr-FERRITE

DRY PRESS

SR - 4B

4100

2900

2950

4.2

ANISOTROPIC Sr-FERRITE

DRY PRESS

 
With their high coercive force Ferrite magnets are difficult to demagnetize when subjected to an external magnetic field. Because the properties listed in underneath table change somewhat with the shape and size of the magnet.