Volume 84, Number 6, December 2008
Article Number 67016
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 12 January 2009
EPL, 84 (2008) 67016
DOI: 10.1209/0295-5075/84/67016

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

D. S. Rana1, I. Kawayama1, K. Takahashi1, K. R. Mavani1, H. Murakami1, M. Tonouchi1, T. Yanagida2, H. Tanaka2 and T. Kawai2

1   Institute of Laser Engineering, Osaka University - 2-6 Yamadaoka, Suita 565-0871, Osaka, Japan
2   Institute of Scientific and Industrial Research, Osaka University - 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan

received 23 July 2008; accepted in final form 18 November 2008; published December 2008
published online 12 January 2009

Structural, magnetic and terahertz emission properties of Bi (Fe1-xMnx)O3  (0 $\leqslant$ x $\leqslant$ 0.5) thin films of various thicknesses were studied. A transition from coherently strained structure to relaxed structure at a film thickness (t) of ~ 80– 90 nm 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 $\leqslant$ 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 $\geqslant$ 150 nm), on the contrary, possess larger magnetic moment which evidently arises from the segregated magnetic MnFe2O4 phase.

77.22.Ej - Polarization and depolarization.
77.84.-s - Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials.
78.47.-p - Spectroscopy of solid state dynamics.

© EPLA 2008