Coercivity

The progress in the twentieth century which has spawned such a range of magnetic applications can be summarized in threewords – mastery of coercivity. No new ferromagnetic material has been discovered with a magnetization greater than that of ‘permendur’, Fe65Co35, forwhich Ms = 1950 kA m⁻¹, but coercivity which barely spanned two orders of magnitude in 1900, from the softest soft iron to the hardest magnet steel, now ranges over eight orders of

Figure 1.1: Progress in expanding the range of coercivity of magnetic materials during the twentieth century.

magnitude, from less than 0.1 A m⁻¹ to more than 10 MA m⁻¹, as shown in Fig. 1.1.

مواضيع ذات صلة

عجائب المجالات المغناطيسية

المجال المغناطيسي الارضي

Planetary magnetism

Therapy and treatment

Cellular biology

Magnetotaxis

Magnetic field effects

Electrodeposition

Magnetic memory

Materials for spin electronics

Actuators

Sensors