Implications of phase-segregation on structure, terahertz emission and magnetization of Bi(Fe1-xMnx)O3 (0 ≤ x ≤ 0.5) thin films

Structural, magnetic and terahertz emission properties of Bi(Fe1-xMnx)O-3 (0 <= x <= 0.5) thin films of various thicknesses were studied. A transition from coherently strained structure to relaxed structure at a film thickness (t) of similar to 80-90nm occurs only for x < 0.2. It is shown that terahertz-emission efficiency is not deteriorated with increasing Mn-doping (x). The magnetic moment of thin films (t <= 85 nm) exhibits only a weak enhancement with increasing x-a feature suggesting that Mn-doping is ineffective in inducing ferromagnetism in BiFeO3. The thicker films (t >= 150 nm), on the contrary, possess larger magnetic moment which evidently arises from the segregated magnetic MnFe2O4 phase. Copyright (C) EPLA, 2008