[55] J. Vít, J. Viirok, L. Peedu, T. Rõõm, U. Nagel, V. Kocsis, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, P. Balla, K. Penc, J. Romhányi, and S. Bordács

In Situ Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic Ba2CoGe2O7

PHYSICAL REVIEW LETTERS 127, 157201 (2021)




[54] D. Szaller, K. Szász, S. Bordács, J. Viirok, T. Rõõm, U. Nagel, A. Shuvaev, L. Weymann, A. Pimenov, A.A. Tsirlin, A. Jesche, L. Prodan, V. Tsurkan, and I. Kézsmárki

Magnetic anisotropy and exchange paths for octahedrally and tetrahedrally coordinated Mn2+ ions in the honeycomb multiferroic Mn2Mo3O8

PHYSICAL REVIEW B 102, 144410 (2020)


[53] T. Rõõm, J. Viirok, L. Peedu, U. Nagel, D.G. Farkas, D. Szaller, V. Kocsis, S. Bordács, I. Kézsmárki, D.L. Kamenskyi, H. Engelkamp, M. Ozerov, D. Smirnov, J. Krzystek, K. Thirunavukkuarasu, Y. Ozaki, Y. Tomioka, T. Ito, T. Datta, and R. S. Fishman

Magnetoelastic distortion of multiferroic BiFeO3 in the canted antiferromagnetic state

PHYSICAL REVIEW B 102, 214410 (2020)


[52] B. Gross, S. Philipp, K. Geirhos, A. Mehlin, S. Bordács, V. Tsurkan, A. Leonov, I. Kézsmárki, and M. Poggio

Stability of Néel-type skyrmion lattice against oblique magnetic fields in GaV4S8 and GaV4Se8

PHYSICAL REVIEW B 102, 104407 (2020)


[51] K. Geirhos, B. Gross, B. G. Szigeti, A. Mehlin, S. Philipp, J. S. White, R. Cubitt, S. Widmann, S. Ghara, P. Lunkenheimer, V. Tsurkan, E. Neuber, D. Ivaneyko, P. Milde, L. M. Eng, A. O. Leonov, S. Bordács, M. Poggio, and I. Kézsmárki

Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host

npj QUANTUM MATERIALS 5, 1 (2020)




[50] V. Kocsis, S. Bordács, Y. Tokunaga, J. Viirok, L. Peedu, T. Rõõm, U. Nagel, Y. Taguchi, Y. Tokura, and I. Kézsmárki

Magnetoelectric spectroscopy of spin excitations in LiCoPO4

PHYSICAL REVIEW B 100, 155124 (2019), ‘Editors’ suggestion’


[49] S. Bordács, M. Orlita, M. Šikula, H. Murakawa, and Y. Tokura

Limits of validity of the Rashba model in BiTeI: High-field magneto-optical study

PHYSICAL REVIEW B 100, 155203 (2019)


[48] L. Peedu, V. Kocsis, D. Szaller, J. Viirok, U. Nagel, T. Rõõm, D. G. Farkas, S. Bordács, D. L. Kamenskyi, U. Zeitler, Y. Tokunaga, Y. Taguchi, Y. Tokura, and I. Kézsmárki

Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phases

PHYSICAL REVIEW B 100, 024406 (2019), ‘Editors’ suggestion’


[47] P. Padmanabhan, F. Sekiguchi, R. B. Versteeg, E. Slivina, V. Tsurkan, S. Bordács, I. Kézsmárki, and P. H. M. van Loosdrecht

Optically Driven Collective Spin Excitations and Magnetization Dynamics in the Néel-type Skyrmion Host GaV4S8

PHYSICAL REVIEW LETTERS 122, 107203 (2019)


[46] Y. Okamura, S. Seki, S. Bordács, Á. Butykai, V. Tsurkan, I. Kézsmárki, and Y. Tokura

Microwave Directional Dichroism Resonant with Spin Excitations in the Polar Ferromagnet GaV4S8

PHYSICAL REVIEW LETTERS 122, 057202 (2019)


[45] J. Viirok, U. Nagel, T. Rõõm, D.G. Farkas, P. Balla, D. Szaller, V. Kocsis,Y. Tokunaga, Y. Taguchi, Y. Tokura, B. Bernáth, D.L. Kamenskyi, I. Kézsmárki, S. Bordács, and K. Penc

Directional dichroism in the paramagnetic state of multiferroics: A case study of infrared light absorption in Sr2CoSi2O7 at high temperatures

PHYSICAL REVIEW B 99, 014410 (2019)




[44] S. Bordács, D.G. Farkas, J.S. White, R. Cubitt, L. DeBeer-Schmitt, T. Ito, and I. Kézsmárki

Magnetic Field Control of Cycloidal Domains and Electric Polarization in Multiferroic BiFeO3

PHYSICAL REVIEW LETTERS 120, 147203 (2018)


[43] B. Fülöp, Z. Tajkov, J. Pető, P. Kun, J. Koltai, L. Oroszlány, E. Tóvári, H. Murakawa, Y. Tokura, S. Bordács, L. Tapasztó, and S. Csonka

Exfoliation of single layer BiTeI flakes

2D MATERIALS 5, 031013 (2018)


[42] V. Kocsis, K. Penc, T. Rõõm, U. Nagel, J. Vit, J. Romhányi, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, and S. Bordács

Identification of Antiferromagnetic Domains Via the Optical Magnetoelectric Effect

PHYSICAL REVIEW LETTERS 121, 057601 (2018)


[41] V. Kocsis, S. Bordács, J. Deisenhofer, L.F. Kiss, K. Ohgushi, Y. Kaneko, Y. Tokura, and I. Kezsmarki

Strong magneto-optical effects in ACr2O4 (A = Fe, Co) spinel oxides generated by tetrahedrally coordinated transition metal ions

PHYSICAL REVIEW B 97, 125140 (2018)


[40] Y. Li, A. Lukács, S. Bordács, J. Moczar, M. Nyitrai, and J. Hebling

The effect of the flexibility of hydrogen bonding network on low-frequency motions of amino acids. Evidence from Terahertz spectroscopy and DFT calculations.



[39] E. Neuber, P. Milde, Á. Butykai, S. Bordács, H. Nakamura, T. Waki, Y. Tabata, K. Geirhos, P. Lunkenheimer, I. Kézsmárki, P. Ondrejkovic, J. Hlinka, and L.M. Eng

Architecture of nanoscale ferroelectric domains in GaMo4S8



[38] J.S. White, Á. Butykai, R. Cubitt, D. Honecker, C.D. Dewhurst, L.F. Kiss, V. Tsurkan, and S. Bordács

Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4S8

PHYSICAL REVIEW B 97, 020401 (2018), ‘Editors’ suggestion’




[37] Á. Butykai, S. Bordács, I. Kézsmárki, V. Tsurkan, A. Loidl, J. Döring, E. Neuber, P. Milde, S.C. Kehr, and L.M. Eng

Characteristics of ferroelectric-ferroelastic domains in Néel-type skyrmion host GaV4S8

SCIENTIFIC REPORTS 7, 44663 (2017)


[36] S. Bordács, Á. Butykai, B.G. Szigeti, J.S. White, R. Cubitt, A.O. Leonov, S. Widmann, D. Ehlers, H.A. von Nidda, V. Tsurkan, A. Loidl, and I. Kézsmárki

Equilibrium Skyrmion Lattice Ground State in a Polar Easy-plane Magnet



[35] Á. Butykai, S. Bordács, L.F. Kiss, B.G. Szigeti, V. Tsurkan, A. Loidl, and I. Kézsmárki

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4 S8: An ac magnetic susceptibility study

PHYSICAL REVIEW B 96, 104430 (2017)


[34] D. Szaller, V. Kocsis, S. Bordács, T. Fehér, T. Rõõm, U. Nagel, H. Engelkamp, K. Ohgushi, and I. Kézsmárki

Magnetic resonances of multiferroic TbFe3(BO3)4

PHYSICAL REVIEW B 95, 024427 (2017)


[33] S. Reschke, F. Mayr, Zhe Wang, P. Lunkenheimer, Weiwu Li, D. Szaller, S. Bordács, I. Kézsmárki, V. Tsurkan, and A. Loidl

Optical conductivity in multiferroic GaV4S8 and GeV4S8: Phonons and electronic transitions

PHYSICAL REVIEW B 96, 144302 (2017)


[32] R.S. Fishman, S. Bordács, V. Kocsis, I. Kézsmárki, J. Viirok, U. Nagel, T. Rõõm, A. Puri, U. Zeitler, Y. Tokunaga, Y. Taguchi, and Y. Tokura

Competing exchange interactions in multiferroic and ferrimagnetic CaBaCo4O7

PHYSICAL REVIEW B 95, 024423 (2017)


[31] S. Widmann, E. Ruff, A. Günther, H.A. Krug, von Nidda, P. Lunkenheimer, V. Tsurkan, S. Bordács, I. Kézsmárki, and A. Loidl

On the multiferroic skyrmion-host GaV4S8





[30] J. Hlinka, F. Borodavka, I. Rafalovskyi, Z. Docekalova, J. Pokorny, I. Gregora, V. Tsurkan, H. Nakamura, F. Mayr, C.A. Kuntscher, A. Loidl, S. Bordács, D. Szaller, H.-J. Lee, J. H. Lee, and I. Kézsmárki

Lattice modes and the Jahn-Teller ferroelectric transition of GaV4S8

PHYSICAL REVIEW B 94, 060104 (2016)


[29] V. Kocsis, Y. Tokunaga, S. Bordács, M. Kriener, A. Puri, U. Zeitler, Y. Taguchi, Y. Tokura, and I. Kézsmárki

Magnetoelectric effect and magnetic phase diagram of a polar ferrimagnet CaBaFe4O7

PHYSICAL REVIEW B 93, 014444 (2016)




[28] R. Akashi, M. Ochi, S. Bordács, R. Suzuki, Y. Tokura, Y. Iwasa, and R. Arita

Two-Dimensional Valley Electrons and Excitons in Noncentrosymmetric 3R-MoS2



[27] S. Bordács, V. Kocsis, Y. Tokunaga, U. Nagel, T. Rõõm, Y. Takahashi, Y. Taguchi, and Y. Tokura,

Unidirectional terahertz light absorption in the pyroelectric ferrimagnet CaBaCo4O7

PHYSICAL REVIEW B 92, 214441 (2015)


[26] E. Ruff, S. Widmann, P. Lunkenheimer, V. Tsurkan, S. Bordács, I. Kézsmárki, and A. Loidl

Multiferroicity and skyrmions carrying electric polarization in GaV4S8

SCIENCE ADVANCES 1, e1500916 (2015)


[25] I. Kézsmárki, U. Nagel, S. Bordács, R.S. Fishman, J.H. Lee, Taek Yi Hee, S.-W. Cheong, and T. Rõõm

Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature Multiferroic BiFeO3

PHYSICAL REVIEW LETTERS 115, 127203 (2015)


[24] I. Kézsmárki, S. Bordács, P. Milde, E. Neuber, L.M. Eng, J.S. White, H.M. Rønnow, C.D. Dewhurst, M. Mochizuki, K. Yanai, H. Nakamura, D. Ehlers, V. Tsurkan, and A. Loidl

Néel-type Skyrmion Lattice with Confined Orientation in the Polar Magnetic Semiconductor GaV4S8

NATURE MATERIALS 14, 1116 (2015)


[23] R.S. Fishman, J.H. Lee, S. Bordács, I. Kézsmárki, U. Nagel, and T. Rõõm

Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroic BiFeO3

PHYSICAL REVIEW B 92, 094422 (2015)


[22] S. Bordács, and Y. Tokura

Novel optical properties of spin-wave excitations in non-centrosymmetric oxides: the case of Ba2CoGe2O7

In: Jean-Yves, Bigot; Wolfgang, Hübner; Theo, Rasing; Roy, Chantrell (eds.) Ultrafast Magnetism I : Proceedings of the International Conference UMC 2013

Cham (Switzerland) : Springer International Publishing, (2015) pp. 89-91. , 3 p.




[21] D. Szaller, S. Bordács, V. Kocsis, T. Rõõm, U. Nagel, and I. Kézsmárki

Effect of spin excitations with simultaneous magnetic- and electric-dipole character on the static magnetoelectric properties of multiferroic materials

PHYSICAL REVIEW B 89, 184419 (2014)


[20] I. Kézsmárki, D. Szaller, S. Bordács, V. Kocsis, Y. Tokunaga, Y. Taguchi, H. Murakawa, Y. Tokura, H. Engelkamp, T. Rõõm, and U. Nagel

One-way Transparency of Four-coloured Spin-wave Excitations in Multiferroic Materials



[19] V. Hutanu, A.P. Sazonov, M. Meven, G. Roth, A. Gukasov, H. Murakawa, Y. Tokura, D. Szaller, S. Bordács, I. Kézsmárki, V.K. Guduru, L.C.J.M. Peters, U. Zeitler, J. Romhányi, and B. Náfrádi

Evolution of the 2D antiferromagnetism with temperature and magnetic field in multiferroic Ba2CoGe2O7

PHYSICAL REVIEW B 89, 064403 (2014)




[18] S. Bordács, J.G. Checkelsky, H. Murakawa, H.Y. Hwang, and Y. Tokura

Landau Level Spectroscopy of Dirac Electrons in a Polar Semiconductor with Giant Rashba Spin Splitting

PHYSICAL REVIEW LETTERS 111, 166403 (2013)


[17] Á. Butykai, Á. Orbán, V. Kocsis, D. Szaller, S. Bordács, E. Tátrai-Szekeres, L.F. Kiss, A. Bóta, B.G. Vértessy, T. Zelles, and I. Kézsmárki

Malaria pigment crystals as magnetic micro-rotors: Key for high-sensitivity diagnosis



[16] V. Kocsis, S. Bordács, D. Varjas, K. Penc, A. Abouelsayed, C.A. Kuntscher, K. Ohgushi, Y. Tokura, and I. Kézsmárki

Magnetoelasticity in ACr2O4 spinel oxides (A= Mn, Fe, Co, Ni, and Cu)

PHYSICAL REVIEW B 87, 064416 (2013)


[15] D. Szaller, S. Bordács, and I. Kézsmárki

Symmetry conditions for nonreciprocal light propagation in magnetic crystals

PHYSICAL REVIEW B 87, 014421 (2013)




[14] S. Bordács, I. Kézsmárki, D. Szaller, L. Demkó, N. Kida, H. Murakawa, Y. Onose, R. Shimano, T. Rõõm, U. Nagel, S. Miyahara, N. Furukawa, and Y. Tokura

Chirality of matter shows up via spin excitations

NATURE PHYSICS 8, 734 (2012)


[13] L. Demkó, S. Bordács, T. Vojta, D. Nozadze, F. Hrahsheh, C. Svoboda, B. Dóra, H. Yamada, M. Kawasaki, Y. Tokura, and I. Kézsmárki

Disorder Promotes Ferromagnetism: Rounding of the Quantum Phase Transition in Sr1-xCaxRuO3

PHYSICAL REVIEW LETTERS 108, 185701 (2012)


[12] V. Hutanu, A. Sazonov, M. Meven, H. Murakawa, Y. Tokura, S. Bordács, I. Kézsmárki, and B. Náfrádi

Determination of the magnetic order and the crystal symmetry in the multiferroic ground state of Ba2CoGe2O7

PHYSICAL REVIEW B 86, 104401 (2012)


[11] K. Penc, J. Romhányi, T. Rõõm, U. Nagel, Á. Antal, T. Fehér, A. Jánossy, H. Engelkamp, H. Murakawa, Y. Tokura, D. Szaller, S. Bordács, and I. Kézsmárki

Spin-stretching modes in non-centrosymmetric magnets: spin-wave excitations in the multiferroic Ba2CoGe2O7

PHYSICAL REVIEW LETTERS 108, 257203 (2012)




[10] I. Kézsmárki, N. Kida, H. Murakawa, S. Bordács, Y. Onose, and Y. Tokura

Enhanced Directional Dichroism of Terahertz Light in Resonance with Magnetic Excitations of the Multiferroic Ba2CoGe2O7 Oxide Compound

PHYSICAL REVIEW LETTERS 106, 057403 (2011)




[9] S. Bordács, I. Kézsmárki, K. Ohgushi, and Y. Tokura

Experimental band structure of the nearly half-metallic CuCr2Se4: an optical and magneto-optical study

NEW JOURNAL OF PHYSICS 12, 053039 (2010)


[8] L. Demkó, I. Kézsmárki, M. Csontos, S. Bordács, and G. Mihály

Improved thermal relaxation method for the simultaneous measurement of the specific heat and thermal conductivity





[7] S. Bordács, D. Varjas, I. Kézsmárki, G. Mihály, L. Baldassarre, A. Abouelsayed, C.A. Kuntscher, K. Ohgushi, and Y. Tokura

Magnetic-order-induced crystal symmetry lowering in ACr2O4 ferrimagnetic spinels

PHYSICAL REVIEW LETTERS 103, 077205 (2009)


[6] S. Iguchi, S. Kumakura, Y. Onose, S. Bordács, I. Kézsmárki, N. Nagaosa, and Y. Tokura

Optical Probe for Anomalous Hall Resonance in Ferromagnets with Spin Chirality

PHYSICAL REVIEW LETTERS 103, 267206 (2009)




[5] N. Hosaka, H. Yamada, Y. Shimada, J. Fujioka, S. Bordács, I. Kézsmárki, M. Kawasaki, and Y. Tokura

Magneto-Optical Characterization on the Ferromagnetic-Paramagnetic Transitions in the Composition-Spread Epitaxial Film of Sr1-xCaxRuO3



[4] I. Kézsmárki, and S. Bordács

New type of ellipsometry in infrared spectroscopy: The double-reference method



[3] G. Mihály, M. Csontos, S. Bordács, I. Kézsmarki, T. Wojtowicz, X. Liu, B. Jankó, and J.K. Furdyna

Anomalous Hall effect in (In,Mn)Sb dilute magnetic semiconductor

PHYSICAL REVIEW LETTERS 100, 107201 (2008)




[2] I. Kézsmárki, R Gáal, C.C. Homes, B. Sipos, H. Berger, S. Bordács, G. Mihály, and L. Forró

High-pressure infrared spectroscopy: Tuning of the low-energy excitations in correlated electron systems

PHYSICAL REVIEW B 76, 205114 (2007)




[1] S. Bordács, A. Agod, Z. Hórvölgyi

Compression of Langmuir films composed of fine particles: Collapse mechanism and wettability

LANGMUIR 22, 6944 (2006)