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(a) Schematic illustration showing the spherical coordinates used in the calculation and evolution of the effective, (b) elastic moduli, (c) piezomagnetic constants, and (d) magnetic permeabilities of a Terfenol-D rod as a function of the applied static external magnetic field. The effective elastic and piezomagnetic constants are expressed in Voigt notation.
(a) The square-lattice 2D phononic crystal consisting of magneto-elastic square rod of infinite length along the direction made of Terfenol-D embedded in an epoxy matrix. Band structure of a square lattice of Terfenol-D square rods with a filling factor , embedded in an epoxy matrix for two applied static magnetic field: (b) and (c) . The inset shows the irreducible Brillouin zone of the square array.
Evolution of the absolute elastic band gaps as a function of the applied static external magnetic field.
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