Independent ferroelectric contributions and rare-earth-induced polarization reversal in multiferroic TbMn2O5

Abstract

Three independent contributions to the magnetically induced spontaneous polarization of multiferroic TbMn2O5 are uniquely separated by optical second harmonic generation and an analysis in terms of Landau theory. Two of them are related to the magnetic Mn3+/4+ order and are independent of applied fields of up to 7 T. The third contribution is related to the long-range antiferromagnetic Tb3+ order. It shows a drastic decrease upon the application of a magnetic field and mediates the change of sign of the spontaneous electric polarization in TbMn2O5. The close relationship between the rare-earth long-range order and the non-linear optical properties points to isotropic Tb-Tb exchange and oxygen spin polarization as mechanism for this rare-earth induced ferroelectricity.

8 pages, 5 figures

References in corpus (10)

• Spin-polarization coupling in multiferroic transition-metal oxides
• A Neutron diffraction study of multiferroics RMn2O5
• Pressure induced enhancement of ferroelectricity in multiferroic $R$Mn${}_2$O${}_5$($R$=Tb,Dy, and Ho)
• Non-resonant and Resonant X-ray Scattering Studies on Multiferroic TbMn2O5
• Observation of Electronic Ferroelectric Polarization in Multiferroic YMn${}_2$O${}_5$
• Antiferromagnetically spin polarized oxygen observed in magneto-electric TbMn2O5
• Induced ferroelectric phases in TbMn_2O_5
• Determination of magnetic order of the rare-earth ions in multiferroic TbMn2O5
• Strong magnetoelastic effect on the magnetoelectric phenomena of TbMn${}_2$O${}_5$
• Magnetically induced electric polarization reversal in multiferroic TbMn${}_2$O${}_5$: Terbium spin reorientation studied by resonant x-ray diffraction

Cited by in corpus (2)

• Experimental observation of ferrielectricity in multiferroic DyMn2O5: revisiting the electric polarization
• Direct Visualization of Irreducible Ferrielectricity in Crystals