On the Neel temperature and magnetic domain wall movements of Ga2−xFexO3 single crystals grown by floating-zone technique

•Transformation to softer magnets with increasing Fe compositions is evident.•Behavior of magnetization curves reveals the movement of magnetic domain walls.•Hopping conduction mechanism is apparent from the dielectric spectra. Single crystals of piezoelectric ferrimagnet, Gallium ferrite Ga2−xFexO3 (x=0.8, 1.0 and 1.2) were grown by optical floating zone technique. Phase confirmation was done by X-ray diffraction and the lattice parameters were determined via Rietveld refinement which shows a linear variation. Composition of the grown crystals was confirmed by energy dispersive X-ray spectra. Temperature and frequency dependent dielectric spectra have been used to explain the conduction mechanism in Ga2−xFexO3 single crystals. Dielectric constant of 1610 was obtained for GaFeO3 (x=1) and increases with x. With increasing iron concentration, a linear increase in TN is observed and the crystals transform as softer magnets.