Modeling of Terfenol-D Biased Minor Hysteresis Loops

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 factorkand by curve shape parametera. The parameterkincreases with the amplitude of the minor loop driving magnetic field and decreases with the bias magnetic field, while parameteradecreases with the bias magnetic field of the minor loop. A sigmoid curve function was adopted as the revision function ofkanda. 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%.