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Birefringence Microscopy With Magnetic-Field Aligned Multiferroic Janus Nanofibers, Yu-Chun Yeh
Birefringence Microscopy With Magnetic-Field Aligned Multiferroic Janus Nanofibers, Yu-Chun Yeh
Theses and Dissertations
Multiferroic Janus nanofibers consisting of barium titanate (BaT iO3) and cobalt ferrite (CoFe2O4) have the magnetoelectric effect between piezoelectric and magnetostrictive phases. By applying an external magnetic field on Janus nanofibers,the dipole moment in piezoelectric phase would be formed and produce the electric field. Since poly(N-vinylcarbazole) (PVK) polymer has anisotropic property, the birefringence can be induced by the electric field. We generalize the magnetic field birefringence quadratic equation and coupling constant for PVK polymer with Janus nanofibers. Birefringence microscopy is used to observe the PVK birefringence under an external magnetic field from 0 to 2500 Oe. The numerical results show …