183 citations · 682 across the 19 of their papers we have counts for
19 papers
Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO
D. G. Farkas, D. Szaller, I. Kézsmárki +9
We report the magnetic field dependence of the THz absorption and non-reciprocal directional dichroism spectra of BiFeO measured on the three principal crystal cuts for fields…
Strong magneto-optical effects in ACr2O4 A=Fe, Co spinel oxides generated by tetrahedrally coordinated transition metal ions
Vilmos Kocsis, Sándor Bordács, Joachim Deisenhofer +5
Magneto-optical effects have been investigated over the infrared{visible spectral range in ACr2O4 (A = Fe, Co) spinel oxides with non-collinear spin orders in their ground states.…
The Magnetoelastic Distortion of Multiferroic BiFeO in the Canted Antiferromagnetic State
Toomas Rõõm, Johan Viirok, Laur Peedu +17
Using THz spectroscopy, we show that the spin-wave spectrum of multiferroic BiFeO in its high-field canted antiferromagnetic state is well described by a spin model that violat…
Limits of Validity of Rashba Model in BiTeI: A High-field Magneto-optical Study
S. Bordacs, M. Orlita, M. Sikula +2
It was recently shown that BiTeI, a semiconductor with polar crystal structure, possesses a giant spin-splitting of electrons, which has been interpreted in terms of Rashba-type sp…
Exfoliation of single layer BiTeI flakes
Bálint Fülöp, Zoltán Tajkov, János Pető +9
Spin orbit interaction can be strongly boosted when a heavy element is embedded into an inversion asymmetric crystal field. A simple structure to realize this concept in a 2D cryst…
Cycloidally modulated magnetic order stabilized by thermal fluctuations in the Néel-type skyrmion host GaVS
J. S. White, Á. Butykai, R. Cubitt +5
We report small-angle neutron scattering studies of the lacunar spinel GaVS, which reveal the long-wavelength magnetic states to be cycloidally modulated. This provides dir…
Optical conductivity in multiferroic GaVS and GeVS: Phonons and electronic transitions
S. Reschke, F. Mayr, Zhe Wang +7
We report on optical spectroscopy on the lacunar spinels GaVS and GeVS in the spectral range from 100 to 23000 cm and for temperatures from 5 to 300 K. These…
Relaxation dynamics of modulated magnetic phases in skyrmion host GaV4S8: an ac magnetic susceptibility study
Ádám Butykai, Sándor Bordács, Lászlo F. Kiss +4
We report on the slow magnetization dynamics observed upon the magnetic phase transitions of GaV4S8, a multiferroic compound featuring a long-ranged cycloidal magnetic order and a…
Magnetic resonances of multiferroic TbFe(BO)
Dávid Szaller, Vilmos Kocsis, Sándor Bordács +6
Low-energy magnetic excitations of the easy-axis antiferromagnet TbFe(BO) are investigated by far-infrared absorption and reflection spectroscopy in high magnetic field…
Competing Exchange Interactions in the Multiferroic and Ferrimagnetic CaBaCoO
R. S. Fishman, S. Bordács, V. Kocsis +9
Competing exchange interactions can produce complex magnetic states together with spin-induced electric polarizations. With competing interactions on alternating triangular and kag…
Spin-Induced Polarizations and Non-Reciprocal Directional Dichroism of Multiferroic BiFeO
Randy S. Fishman, Jun Hee Lee, Sándor Bordács +3
A microscopic model for the room-temperature multiferroic BiFeO that includes two Dzyaloshinskii-Moriya interactions and single-ion anisotropy along the ferroelectric polarizat…
Néel-type Skyrmion Lattice with Confined Orientation in the Polar Magnetic Semiconductor GaVS
I. Kézsmárki, S. Bordács, P. Milde +11
Following the early prediction of the skyrmion lattice (SkL) - a periodic array of spin vortices - it has been observed recently in various magnetic crystals mostly with chiral str…
Two-Dimensional Valley Electrons and Excitons in Noncentrosymmetric 3R MoS
Ryosuke Akashi, Masayuki Ochi, Sándor Bordács +4
We find that the motion of the valley electrons -- electronic states close to the and points of the Brillouin zone -- is confined into two dimension when the l…
Simultaneously Magnetic- and Electric-dipole Active Spin Excitations Govern the Static Magnetoelectric Effect in Multiferroic Materials
D. Szaller, S. Bordacs, V. Kocsis +3
We derive a sum rule to demonstrate that the static magnetoelectric (ME) effect is governed by optical transitions that are simultaneously excited via the electric and magnetic com…
Magnetoelasticity in ACr2O4 spinel oxides
V. Kocsis, S. Bordács, D. Varjas +6
Dynamical properties of the lattice structure was studied by optical spectroscopy in ACr2O4 chromium spinel oxide magnetic semiconductors over a broad temperature region of T=10-33…
Spin-stretching modes in anisotropic magnets: spin-wave excitations in the multiferroic Ba2CoGe2O7
K. Penc, J. Romhányi, T. Rõõm +10
We studied spin excitations of the multiferroic Ba2CoGe2O7 in high magnetic fields up to 33 T. In the electron spin resonance and far infrared absorption spectra we found several s…
Giant directional dichroism of terahertz light in resonance with magnetic excitations of the multiferroic oxide BaCoGeO
I. Kezsmarki, N. Kida, H. Murakawa +3
We propose that concurrently magnetic and ferroelectric, i.e. multiferroic, compounds endowed with electrically-active magnetic excitations (electromagnons) provide a key to produc…
Experimental band structure of the nearly half-metallic CuCrSe: An optical and magneto-optical study
S. Bordács, I. Kézsmárki, K. Ohgushi +1
Diagonal and off-diagonal optical conductivity spectra have been determined form the measured reflectivity and magneto-optical Kerr effect (MOKE) over a broad range of photon energ…
High-pressure infrared spectroscopy: tuning of the low-energy excitations in correlated electron systems
I. Kezsmarki, R. Gaal, C. C. Homes +5
We have extended the range of the high-pressure optical spectroscopy to the far-infrared region keeping the accuracy of ambient-pressure experiments. The newly-developed method off…