| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a magnetic material having an intermediate hysterisis loop between a rectangular hysterisis loop and a flat hysterisis loop in high reproducibility, by a method wherein the magnetic material is impressed with a magnetic field in a series of pulse states, while provided with the part at the maximum value of the magnetic field intensity and at the minimum value of the same. SOLUTION: Heat-treatment in the magnetic field for a magnetic part is performed for a magnetic material made of a soft magnetic alloy having low anisotropy, and annealing is performed at a temperature lower than the Curie temperature of soft magnetic alloy in the magnetic field to be intermittently impressed with the magnetic field. At this time, a series of magnetic field in the states of C1 , C2 , C3 and C4 are impressed while providing respective pulses with the first part Δt and the second part Δt' in the duration time. The first part and the second part are respectively provided with the maximum value of H max and the minimum value of H min. Accordingly, the magnetic material made of the soft magnetic alloy having the ratio of the residual magnetic induction to the maximum magnetic induction of 0.3-0.9 can be manufactured in high reproducibility. |
