Magnetic-Field-Induced Stress-Birefringence in Laminate Composites of Terfenol-D and Polycarbonate

The laminate composites that can show the magneto-birefringence effect are suggested and fabricated by the product of magnetostriction and stress-birefringence. Under a magnetic field no stronger than 1900 Oe, a phase difference of ～3.3π is observed for a trilayer composite Tb_1?xDy_xFe_2?y/polycarbonate/Tb_1?xDy_xFe_2?y with a polycarbonate layer at a size of 5 × 2.75 × 20 mm³ at room temperature, resulting in a half-wave magnetic field of no greater than 270 Oe.