Research on the tunability of point defect modes in a two-dimensional magneto-elastic phononic crystal

• Published in: Journal of physics. D, Applied physics Vol. 49; no. 17; pp. 175103 - 175113
• Main Authors: Gu, Chunlong, Jin, Feng
• Format: Journal Article
• Language: English
• Published: IOP Publishing 05.05.2016
• Subjects: Constitutive relationships; Crystal defects; Energy gaps (solid state); giant magnetostrictive material; Lattice vibration; Magnetic fields; Magnetostriction; phononic crystal; point defect modes; Point defects; Two dimensional
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/49/17/175103

Point defect modes in a 2D phononic crystal with giant magnetostrictive material tuned by a magnetic field and compressive stress are investigated theoretically in this study. The 3D magnetostrictive constitutive model proposed by Liu and Zheng (2005 Acta Mech. Sin. 21 278-85) is adopted to develop effective elastic, piezomagnetic, and magnetic permeability constants. The finite element method, in combination with a supercell technique, is then applied to obtain the band structures and transmission spectra of the point defect modes in a 2D phononic crystal composed of Terfenol-D rods of circular cross section embedded in a polymethyl methacrylate matrix with a square lattice. The magnetic field not only enlarges the first band gap (FBG) but also opens up a new band gap of XY modes. New point defect modes are simultaneously trapped in the band gaps. The width of the FBG and the frequencies of the point defects of the Z mode decrease as the magnetic field increases.