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

D. S. Rana; I. Kawayama; K. Takahashi; K. R. Mavani; H. Murakami; M. Tonouchi; T. Yanagida; H. Tanaka; T. Kawai

doi:10.1209/0295-5075/84/67016

All issues

Volume 84 / No 6 (December 2008)

EPL, 84 6 (2008) 67016

Abstract

Issue		EPL Volume 84, Number 6, December 2008


Article Number		67016
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/84/67016
Published online		12 January 2009

EPL, 84 (2008) 67016

Implications of phase-segregation on structure, terahertz emission and magnetization of Bi (Fe $_{1-x}$ Mn_x)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

Corresponding authors: rana-d@ile.osaka-u.ac.jp tonouchi@ile.osaka-u.ac.jp

Received: 23 July 2008
Accepted: 18 November 2008

Abstract

Structural, magnetic and terahertz emission properties of Bi (Fe $_{1-x}$ Mn_x)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.

PACS: 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

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