Fe-18 at.%Ga alloys with magnetostrictive coefficients up to 400 ppm are expected to have high damping based on the magneto-mechanical hysteresis damping (MMHD) model. However, in some studies of the magnetostrictive properties of Fe-Ga alloys, it was found that the magnetization curves of iron-gallium (Fe-Ga) alloys seem to be reversible, linear, and non-hysteretic curves, indicating that the damping is zero for Fe-Ga alloys. This contradiction makes it a challenge to explore the damping mechanism of Fe-based high damping alloys and possible ways to increase the damping of the alloys.
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Source: Phys.org