Surface Modification and Enhancement of Ferromagnetism in BiFeO₃ Nanofilms Deposited on HOPG.

ABSTRACT: BiFeO₃ (BFO) films on highly oriented pyrolytic graphite (HOPG) substrate were obtained by the atomic layer deposition (ALD) method. The oxidation of HOPG leads to the formation of bubble regions creating defective regions with active centers. Chemisorption occurs at these active sites in ALD. Additionally, carbon interacts with ozone and releases carbon oxides (CO, CO₂). Further annealing during the in situ XPS process up to a temperature of 923 K showed a redox reaction and the formation of oxygen vacancies (V_o) in the BFO crystal lattice. Bubble delamination creates flakes of BiFeO_3-x/rGO heterostructures. Magnetic measurements (M-H) showed ferromagnetism (FM) at room temperature M_s ~ 120 emu/cm³. The contribution to magn

SUBMITTER: Ramazanov S 

PROVIDER: S-EPMC7600225 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature