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Spectral origin of the colossal magnetodielectric effect in multiferroic DyMn2O5
A. B. Sushkov, Ch. Kant, M. Schiebl +8
The origin of the colossal magnetodielectric effect in DyMn2O5 [1] has been an outstanding question in multiferroics. Here, we report the activation of the electric dipole mode at…
Optical identification of hybrid magnetic and electric excitations in Dy3Fe5O12 garnet
P. D. Rogers, Y. J. Choi, E. Standard +10
Far-infrared spectra of magneto-dielectric Dy3Fe5O12 garnet were studied between 13 and 100 cm-1 and at low temperatures between 5 and 80 K. A combination of transmission, reflecti…
Magnetic excitations in the low-temperature ferroelectric phase of multiferroic YMn2O5 using inelastic neutron scattering
J. -H. Kim, M. A. van. der. Vegte, A. Scaramucci +6
We studied magnetic excitations in a low-temperature ferroelectric phase of the multiferroic YMn2O5 using inelastic neutron scattering (INS). We identify low-energy magnon modes an…
Coupling between magnon and ligand-field excitations in magnetoelectric Tb3Fe5O12 garnet
T. D. Kang, E. Standard, K. H. Ahn +7
The spectra of far-infrared transmission in Tb3Fe5O12 magnetoelectric single crystals have been studied in the range between 15 and 100 cm-1, in magnetic fields up to 10 T, and for…
Magnetic excitations and optical transitions in the multiferroic spin-1/2 system LiCuO
D. Hüvonen, U. Nagel, T. Rõõm +4
Magnetic excitations in cycloidal magnet LiCuO are explored using THz absorption spectroscopy in magnetic fields up to 12 T. Below the spin ordering temperature we observe…
Pressure-induced polarization reversal in multiferroic
Rajit P. Chaudhury, Clarina R. dela Cruz, Bernd Lorenz +4
The low-temperature ferroelectric polarization of multiferroic is completely reversed at a critical pressure of 10 kbar and the phase transition from the incommensurate…
Non-resonant and Resonant X-ray Scattering Studies on Multiferroic TbMn2O5
J. Koo, C. Song, S. Ji +15
Comprehensive x-ray scattering studies, including resonant scattering at Mn L-edge, Tb L- and M-edges, were performed on single crystals of TbMn2O5. X-ray intensities were observed…
Symmetry of Multiferroicity in a Frustrated Magnet TbMnO
J. Okamoto, D. J. Huang, C. -Y. Mou +5
Based on measurements of soft x-ray magnetic scattering and symmetry considerations, we demonstrate that the magnetoelectric effect in TbMnO arises from an internal field d…
Infrared-active excitations related to Ho3+ ligand-field splitting at the commensurate-incommensurate magnetic phase transition in HoMn2O5
A. A. Sirenko, S. M. O Malley, K. H. Ahn +3
Linearly polarized spectra of far-infrared (IR) transmission in HoMn2O5 multiferroic single crystals have been studied in the frequency range between 8.5 and 105 cm-1 and for tempe…
Magnetoelastic Effects and Magnetic Phase Diagram of Multiferroic
C. R. dela Cruz, B. Lorenz, Y. Y. Sun +3
The magnetoelastic coupling in multiferroic is investigated by magnetostriction measurements along the three crystallographic orientations. Strong lattice anomalies as…
Electromagnons in multiferroic YMn2O5 and TbMn2O5
A. B. Sushkov, R. Valdes Aguilar, S. Park +2
Based on temperature dependent far infrared transmission spectra of YMn2O5 and TbMn2O5 single crystals, we report the observation of electric dipole-active magnetic excitations, or…
Structural Anomalies at the Magnetic and Ferroelectric Transitions in (R=Tb, Dy, Ho)
C. R. dela Cruz, F. Yen, B. Lorenz +6
Strong anomalies of the thermal expansion coefficients at the magnetic and ferroelectric transitions have been detected in multiferroic . Their correlation with anomalies…
Relating supercooling and glass-like arrest of kinetics for phase separated systems: studies on doped CeFe and (La,Pr,Ca)MnO
Kranti Kumar, A. K. Pramanik, A. Banerjee +5
Coexisting ferromagnetic and antiferromagnetic phases over a range of temperature as well as magnetic field have been reported in many materials of current interest, showing disord…
Spin structure and magnetic frustration in multiferroic RMn2O5 (R = Tb, Ho, Dy)
G. R. Blake, L. C. Chapon, P. G. Radaelli +4
We have studied the crystal and magnetic structures of the magnetoelectric materials RMn2O5 (R = Tb, Ho, Dy) using neutron diffraction as a function of temperature. All three mater…