Room-temperature multiferroic properties of Al-doped hexaferrites sintered at high oxygen atmospheric concentrations

Abstract The room-temperature magnetoelectric effects of Al-doped polycrystalline hexaferrites Sr3Co2(Fe1-xAlx)24O41(x = 0.00, 0.02, and 0.04) sintered under high oxygen atmospheric concentrations were comprehensively investigated. The magnetic phases and magnetic structures were modulated by high sintering oxygen atmospheric concentrations as demonstrated by M-T tests and magnetic hysteresis loops. Compared with previous specimens sintered under low oxygen atmospheric concentrations, the transverse conical spin structures of the Sr3Co2(Fe1-xAlx)24O41(x = 0.00, 0.02, and 0.04) were obviously strengthened by high sintering oxygen atmospheric concentrations, exhibiting magnetoelectric effects in high magnetic field ranges (>1 T).