Abstract
In this paper, we fabricated novel magnetostrictive composites by embedding 110-oriented Tb-Dy-Ho-Fe fibers in an epoxy matrix. The magnetostrictive and magnetic properties (magnetostriction, magnetization, piezomagnetic coefficient and relative permeability) of the proposed composites were measured, analyzed, and compared to those of TbSUB0.29/SUBDySUB0.48/SUBHoSUB0.23/SUBFeSUB1.9/SUB alloy and TbSUB0.3/SUBDySUB0.7/SUBFe₂ continuous-fiber/epoxy composites. TbSUB0.29/SUBDySUB0.48/SUBHoSUB0.23/SUBFeSUB1.9/SUB continuous-fiber/epoxy composites have a saturation magnetostriction (λSUBs/SUB) of 840 ppm and saturation magnetization (MSUBs/SUB) of 0.75 T. Their piezomagnetic coefficient exhibits a maximum value (8.2 μm/kA) at 19 kA/m. These proposed composites exhibit a large magnetostriction in high magnetic fields ( 400 kA/m) and a large relative permeability in low magnetic fields ( 100 kA/m). This result indicates that the given composites perform better than the TbSUB0.29/SUBDySUB0.48/SUBHoSUB0.23/SUBFeSUB1.9/SUB alloy and TbSUB0.3/SUBDySUB0.7/SUBFe₂ fiber/epoxy composites. Thus, the composites with characteristics of high sensitivity and large magnetostriction can be used in the field of ultrasonic sensing.
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