Interplay of 4f-3d Magnetism and Ferroelectricity in DyFeO3

Abstract

DyFeO3 exhibits a weak ferromagnetism (TNFe ~ 645 K) that disappears below a spin-reorientation (Morin) transition at TSRFe ~ 50 K. It is also known that applied magnetic field induces ferroelectricity at the magnetic ordering temperature of Dy-ions (TNDy ~ 4.5 K). Here, we show that the ferroelectricity exists in the weak ferromagnetic state (TSRFe < T < TN,C) without applying magnetic field, indicating the crucial role of weak ferromagnetism in inducing ferroelectricity. 57Fe Mössbauer studies show that hyperfine field (Bhf) deviates from mean field-like behaviour that is observed in the weak ferromagnetic state and decreases below the onset of spin-reorientation transition (80 K), implying that the Bhf above TSR had additional contribution from Dy-ions due to induced magnetization by the weak ferromagnetic moment of Fe-sublattice and below TSR, this contribution decreases due to collinear ordering of Fe-sublattice. These results clearly demonstrate the presence of magnetic interactions between Dy(4f) and Fe(3d) and their correlation with ferroelectricity in the weak ferromagnetic state of DyFeO3.

arXiv comment5 pages, 6 figures, published in EPL

References in corpus (5)

• Robust isothermal electric switching of interface magnetization: A route to voltage-controlled spintronics
• Field-induced Polar Order at the Néel Temperature of Chromium in Rare-earth Orthochromites: Interplay of Rare-earth and Cr Magnetism
• The multiferroic phase of DyFeO${}_3$:an ab--initio study
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• Magnetic phase diagram of HoFeO${}_3$ by neutron diffraction
• Neutron inelastic scattering study of rare-earth orthoferrite HoFeO${}_3$
• Coexisting magnetic structures and spin-reorientation in Er${}_{0.5}$Dy${}_{0.5}$FeO${}_3$: Bulk magnetization, neutron scattering, specific heat, and \emph{Ab-initio} studies