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Two self-biased Terfenol-D 2-2 composites have been produced with laminations perpendicular to (112) and an internal magnetic field along . The characteristic frequency of a sample of dimensions 2.5 ×7.0×10.0 mm has been increased to 53 kHz compared to 0.2 kHz for the bulk material by increasing the resistivity to 1×10-5 Ωm. The static strain along [1~1~1] was found to be 752 and 647 ppm for the two samples when [1~1~1] was parallel to the externally applied field Happl. When [1~1~1] was perpendicular to Happl the internal field Hint must be added to Happl thereby giving an asymmetrical strain versus Happl curve. Eddy currents have been reduced by the introduction of a thin insulating layer, the mechanical properties of which critically control the magnetoelastic performance of the composite.
Date of Publication: Oct. 2005