Thermoelastic-tunable magnetic response of BiFeO_3 thin film on colloidal photonic crystal substrate fabricated by pulsed laser deposition

摘要

Investigation of the thernioelaslic-uinable magnetic response of polycrystalline bismuth ferrile thin film is herein reported. The polycrystallinc bismuth ferrite thin Minis were grown by room-temperature pulsed laser deposition on the designed polymer colloidal photonic crystal substrates. The evolution of these films was assessed by X-ray diffraction testing and scanning electron microscopy images. The thermal-dependent magnetic measurements and magneto-optical properties were also investigated us a function of deposition substrate and target-suhstrate distances via the Faraday rotation method. Due to the large anisotropic thermal deformation of the polymer colloidal interface, the huge rotation downshift was observed versus a slight thermal change. Furthermore, we found that this returnable reduction had the same behavior during the heating and cooling processes. This reversible thermal property of the polymer colloidal crystal in combination with the magnetic response of the multiferroic compounds can possibly lead to innovations in sensors and switches based on thermomagneto-optical coupling and facilitate the nano-scale thermal characterization.