Abstract
A 〈1 1 0〉 oriented rod of the alloy Tb 0.3Dy 0.7Fe 1.95 was subjected to a magnetic heat treatment, cooling through its Curie temperature under 240 kA/m. Besides the improved magnetostriction under free conditions, the magnetically annealed rod still exhibited an obvious magnetostriction “jump” effect when subjected to a uniaxial compressive pre-stress. A giant magnetostriction of 2680×10 −6 was achieved under 640 kA/m and 30 MPa, which became 67% larger than before magnetic annealing. The optimum magnetostrictive strain coefficient d 33 was also dramatically enhanced. Magnetic force microscopy images show magnetic domain configurations that contribute to the improved magnetostrictive performance. The effect of induced additional anisotropy by magnetic annealing on the improvement of the magnetostriction is also discussed.
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