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5.
6.4. ()J 0 , 6.7. , . , , . , 6.7, , . J , . *. * . hysteresis .
J 0 6.8. , 6.7. . 0 b. 0 = 0 . Jk = Ob . . , , . 0, , 0 = . B0c () . , . ' , . ( ), , . . . (18391896). . . , , . . . - - . - (. 6.9), - (. 6.10).
- , , (70% Ni 30% Fe), , . . - . ( ) , , . . . , . ( .) - , . - . . . -5. . 1,25 . , 7 10-5 . : 51% Fe, 8% l, 14% Ni, 24% , 3% u. , . . , , , . . , , . . . .
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