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When modeling the biased minor loops of the giant magnetostrictive material (GMM) with the classic Jiles-Atherton method, it is hard to describe the characters. When analyzing the shape changing rule of the hysteresis minor loops of Terfenol-D, whose magnetizations are not saturated, the shapes of loops are mainly affected by pinning factor k and by curve shape parameter a. The parameter k increases with the amplitude of the minor loop driving magnetic field and decreases with the bias magnetic field, while parameter a decreases with the bias magnetic field of the minor loop. A sigmoid curve function was adopted as the revision function of k and a. The revised minor loop model not only can well demonstrate the hysteresis character of biased minor loops and symmetric minor loops of Terfenol-D, but also does not need any foregoing information of minor loop magnetizations. The maximum error between the simulation results and experiments is reduced from 11.77% to 3.5%.
Date of Publication: Jan. 2013