Physics > Magnetic Properties of Materials
The table below shows the relative magnetic properties of specific ferromagnetic materials.
| Material |
Treatment |
Initial Relative
Permeability |
Maximum Relative
Permeability |
Coercive
Force
(oersteds) |
Remanent Flux
Density
(gauss) |
| Iron, 99.8% pure |
Annealed |
150 |
5000 |
1.0 |
13,000 |
| Iron, 99.95% pure |
Annealed in hydrogen |
10,000 |
200,000 |
0.05 |
13,000 |
| 78 Permalloy |
Annealed, quenched |
8,000 |
100,000 |
.05 |
7,000 |
| Superpermalloy |
Annealed in hydrogen, controlled cooling |
100,000 |
1,000,000 |
0.002 |
7,000 |
| Cobalt, 99% pure |
Annealed |
70 |
250 |
10 |
5,000 |
| Nickel, 99% pure |
Annealed |
110 |
600 |
0.7 |
4,000 |
| Steel, 0.9% C |
Quenched |
50 |
100 |
70 |
10,300 |
| Steel, 30% Co |
Quenched |
... |
... |
240 |
9,500 |
| Alnico 5 |
Cooled in magnetic field |
4 |
... |
575 |
12,500 |
| Silmanal |
Baked |
... |
... |
6,000 |
550 |
| Iron, fine powder |
Pressed |
... |
... |
470 |
6,000 |