Magnetic Properties of Ferromagnetic Materials

Magnetic Properties of 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 In this table the remanent flux density is the retained magnetic field B, and the SI unit for B is the Tesla (T). 1 Tesla = 10,000 gauss. The "coercive force" is the applied reverse magnetic field strength H required to force the net magnetic field back to zero after magnetization. The SI unit for H is A/m, and 1 A/m = 0.01257 oersteds. Discussion of relative permeability Coercivity and Remanence

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