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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