Evidence of Magnetoelectric coupling in Bi2(1-x)Ho2xFe4O9 (x=0, 0.01) multiferroic ceramics

National Conference on Processing and Characterization of Materials

Mohapatra, S.R.^1 ; Singh, A.K.^1 ; Kaushik, S.D.^2

Department of Physics and Astronomy, National Institute of Technology, Rourkela

Odisha

769008, India^1

UGC-DAE Consortium for Scientific Research Mumbai Centre, R-5 Shed, BARC, Mumbai

400085, India^2

关键词: Antiferromagnetic transition;    Conventional solid state reaction route;    Magnetodielectrics;    Magnetoelectric couplings;    Magnetoelectric properties;    Multiferroic ceramics;    Temperature dependent;    Weak ferromagnetism;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/178/1/012023/pdf
DOI  :  10.1088/1757-899X/178/1/012023

来源: IOP

【 摘 要 】

We report structural, magnetic, dielectric and magnetoelectric properties of orthorhombic Bi2(1-x)Ho2xFe4O9(x=0, 0.01) ceramics (space group 'Pbam') synthesized by conventional solid state reaction route. Rietveld refined X-ray diffraction (XRD) shows phase formation of the samples along with reduction in lattice parameters and cell volume due to lower ionic radii substitution of Ho3+at Bi3+-site. DC magnetization study revealed antiferromagnetic transition (TN) of the parent (BFO = 250 K) as well as 1% Ho substituted sample (BHFO1 = 253 K) along with increase in magnetization. Opening of hysteresis was observed for BHFO1 sample implying onset of weak ferromagnetism with dominating antiferromagnetic behaviour. Moreover, temperature dependent dielectric (') study and its derivative (d'/dT) for both the samples show significant anomaly around the antiferromagnetic transition (TN) thus, implying a plausible magnetoelectric coupling between the magnetic as well as the electric order parameters in the studied samples. Magnetoelectric coupling was also confirmed from temperature and magnetic field (1.3 T) dependant tan loss plots.