Document Type : Research Article

Author

• Ujjal Chowdhury

Nano-Structured Materials Division, CSIR-Central Glass & Ceramic Research Institute 196, Raja S. C Mullick Street, Jadavpur, Kolkata,700032, India

Abstract

Room temperature multiferroicity has been in the centre of interest for last few years due to its enormous potential to be applied as real multifunctional device. LuFeO₃ is a potential candidate as room temperature multiferroic¹, which offers strong multiferroic coupling at room temperature [1]. Presence of ferroelectric polarization is observed in Mn-doped LuFeO₃ also. The main area of restriction is its low polarization, which is to be improved before it can be applied in real devices.  In order to do that proper understanding of the mechanism of generation of ferroelectricity is needed. In order to do that we observed that, the ferroelectric and multiferroic properties at room temperature, in orthorhombic distorted perovskite LuFeO₃ are greatly affected by Cu or Mn doping. If we replace Fe⁺³ ion (Ionic Radius=126) with some amount another ion of increasing ionic radius Mn⁺² (Ionic Radius=127) and Cu⁺² (Ionic Radius = 128) the ferroelectric properties are greatly affected as evidenced by the P-E Hysteresis loop measurements. The appearance of ferroelectricity in LuFeO₃ could be attributed to the spin current based model as proposed by katsura et al. [3]. The effect of Cu and Mn doping also can be explained with the Spin current based model [3]. Copyright © 2017 VBRI Press.

Keywords

• Improper ferroelectricity
• type-II multiferroics
• magnetism
• spin current model
• remanent polarization