Abstract
The rare earths, both in elemental form and in compounds, are widely known as possessing many extraordinary magnetic properties. In this paper, we focus on the huge magnetically induced displacements (magnetostrictions) based upon the element terbium. A proper balance of magnetic anisotropy and magnetostriction, plus a proper choice of crystal axes lead to materials which can switch large quantities of energy between the internal (magnetic) and external (mechanical) states with the application of small triggering magnetic fields. Power densities 2000 times those of conventional magnetostrictive materials and 10-20 times those of typical piezoceramics are available. These materials are particularly valuable for smart systems where large energy transduction is needed such as active structure stiffening and active vibration control.
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Clark, A.E. High Power Magnetostrictive Materials from Cryogenic Temperatures to 250 C. MRS Online Proceedings Library 360, 171–182 (1994). https://doi.org/10.1557/PROC-360-171
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DOI: https://doi.org/10.1557/PROC-360-171