Coercivity
المؤلف:
J. M. D. COEY
المصدر:
Magnetism and Magnetic Materials
الجزء والصفحة:
9
10-2-2021
1835
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.
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