Spintronics, a combination of spin and electronics, not uses only the electrical charge, but also the intrinsic spin of the electron to process information. Recently, non-collinear chiral magnetic structures called skyrmions have received a lot of interest in the field of spintronics. Magnetic skyrmions are particle-like, highly stable vortical objects, in which the magnetization of the atoms rotates from a ferromagnetic background into the opposite direction in the center of the core.
For an application of skyrmions in data storage devices the knowledge of the temperature and magnetic field dependence is crucial. Especially the description of phase transitions is of prime importance. I use an advanced Monte Carlo technique called parallel tempering Monte Carlo (PTMC) to investigate these properties of skyrmion systems.
Skyrmions can be found in so-called frustrated spin systems where different competing interactions occur. This leads to many metastable states in the energy landscape, hence the description of the system needs a highly sophisticated modeling.
The PTMC uses thermal energy to overcome energy barriers between metastable states to sample a large volume of the phase space. Therefore, a certain number of copies of one spin structures, the so called replicas, were created and simulated at different temperatures. During the simulation time, replicas of adjacent temperatures are getting swapped. In doing so, the replicas were heated up and cooled down during the simulation process. This technique allows an accurate thermodynamical study of different magnetic systems which can host magnetic skyrmions.
Research Interest
Theoretical and computational physics, thermodynamics
Atomistic simulations, density functional theory (DFT)
Spin dynamics
Monte Carlo simulations of frustrated magnets
Publications (Highlights)
B. Dupé, G. Bilhmayer, M. Böttcher, S. Blügel, and S. Heinze "Engineering skyrmions in transition-metal multilayers for spintronics" Nature Communications, 2016, 7, 11779.
B. Dupé, M. Hoffmann, C. Paillard, and S. Heinze "Tailoring magnetic skyrmions in ultra-thin transitions metal films" Nature Communications, 2014, 5, 4030.
B. Dupé, I. C. Infante, G. Geneste, P.-E. Janolin, M. Bibes, A. Barthélémy, S. Lisenkov, L. Bellaiche, S. Ravy, B. Dkhil "Competing phases in BiFeO3 thin films under compressive epitaxial strain" Physical Review B, 2010, 81, 144128.
I. C. Infante, S. Lisenkov, B. Dupé, M. Bibes, S. Fusil, E. Jacquet, G. Geneste, S. Petit, A. Courtial, J. Juraszek, L. Bellaiche, A. Barthélémy, and B. Dkhil "Bridging multiferroic phase transitions by epitaxial strain in BiFeO3" Physical Review Letters, 2010, 105, 057601.
H. Béa, B. Dupé, S. Fusil, R. Mattana, E. Jacquet, B. Warot-Fonrose, F. Wilhelm, A. Rogalev, S. Petit, V. Cros, A. Anane, F. Petroff, K. Bouzehouane, G. Geneste, B. Dkhil, S. Lisenkov, I. Ponomareva, L. Bellaiche, M. Bibes, A. Barthélémy "Evidence for room-temperature multiferroicity in a compound with a giant axial ratio" Physical Review Letters, 2009, 21, 217603.
Marius Weber, Stephan Wust, Luca Haag, Akashdeep Akashdeep, Kai Leckron, Christin Schmitt, Rafael Ramos, Takashi Kikkawa, Eiji Saitoh, Mathias Kläui, Libor Šmejkal, Jairo Sinova, Martin Aeschlimann, Gerhard Jakob, Benjamin Stadtmüller, Hans Christian Schneider All optical excitation of spin polarization in d-wave altermagnets
arXiv:2408.05187
Antonin Badura, Warlley H. Campos, Venkata K. Bharadwaj, Ismaïla Kounta, Lisa Michez, Matthieu Petit, Javier Rial, Miina Leiviskä, Vincent Baltz, Filip Krizek, Dominik Kriegner, Jan Zemen, Sjoerd Telkamp, Sebastian Sailler, Michaela Lammel, Rodrigo Jaeschke Ubiergo, Anna Birk Hellenes, Rafael González-Hernández, Jairo Sinova, Tomáš Jungwirth, Sebastian T. B. Goennenwein, Libor Šmejkal and Helena Reichlova Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3
arXiv:2403.12929
Antonin Badura, Dominik Kriegner, Eva Schmoranzerová, Karel Výborný, Miina Leiviskä, Rafael Lopes Seeger, Vincent Baltz, Daniel Scheffler, Sebastian Beckert, Ismaila Kounta, Lisa Michez, Libor Šmejkal, Jairo Sinova, Sebastian T. B. Goennenwein, Jakub Železný, Helena Reichlová Even-in-magnetic-field part of transverse resistivity as a probe of magnetic order
arXiv:2311.14498
E.F. Galindez-Ruales, Libor Šmejkal, S. Das, E. Baek, C. Schmitt, F. Fuhrmann, A. Ross, R. González-Hernández, A. Rothschild, Jairo Sinova, C.-Y. You, G. Jakob, M. Kläui Anisotropic magnetotransport realized in doped hematite
arXiv:2310.16907
Adithya Rajan, Tom G. Saunderson, Fabian R. Lux, Rocío Yanes Díaz, Hasan M. Abdullah, Arnab Bose, Beatrice Bednarz, Jun-Young Kim, Dongwook Go, Tetsuya Hajiri, Gokaran Shukla, Olena Gomonay, Yugui Yao, Wanxiang Feng, Hidefumi Asano, Udo Schwingenschlögl, Luis López-Díaz, Jairo Sinova, Yuriy Mokrousov, Aurélien Manchon, Mathias Kläui Revealing the higher-order spin nature of the Hall effect in non-collinear antiferromagnet Mn3Ni0.35Cu0.65N
arXiv:2304.10747
Helena Reichlová, Rafael Lopes Seeger, Rafael González-Hernández, Ismaila Kounta, Richard Schlitz, Dominik Kriegner, Philipp Ritzinger, Michaela Lammel, Miina Leiviskä, Václav Petříček, Petr Doležal, Eva Schmoranzerová, Antonín Bad'ura, Andy Thomas, Vincent Baltz, Lisa Michez, Jairo Sinova, Sebastian T. B. Goennenwein, Tomáš Jungwirth and Libor Šmejkal Macroscopic time reversal symmetry breaking by staggered spin-momentum interaction
arXiv:2012.15651
O. J. Amin, A. Dal Din, E. Golias, Y. Niu, A. Zakharov, S. C. Fromage, C. J. B. Fields, S. L. Heywood, R. B. Cousins, J. Krempasky, J. H. Dil, D. Kriegner, B. Kiraly, R. P. Campion, A. W. Rushforth, K. W. Edmonds, S. S. Dhesi, L. Šmejkal, T. Jungwirth, P. Wadley Altermagnetism imaged and controlled down to the nanoscale
arXiv:2405.02409
Javier Rial, Miina Leiviskä, Gregor Skobjin, Antonín Bad'ura, Gilles Gaudin, Florian Disdier, Richard Schlitz, Ismaïla Kounta, Sebastian Beckert, Dominik Kriegner, Andy Thomas, Eva Schmoranzerová, Libor Šmejkal, Jairo Sinova, Tomáš Jungwirth, Lisa Michez, Helena Reichlová, Sebastian T. B. Goennenwein, Olena Gomonay, Vincent Baltz Altermagnetic variants in thin films of Mn5Si3
Phys. Rev. B 110, L220411 (2024)
Miina Leiviskä, Javier Rial, Antonín Badura, Rafael Lopes Seeger, Ismaïla Kounta, Sebastian Beckert, Dominik Kriegner, Isabelle Joumard, Eva Schmoranzerová, Jairo Sinova, Olena Gomonay, Andy Thomas, Sebastian T.B. Goennenwein, Helena Reichlová, Libor Šmejkal, Lisa Michez, Tomáš Jungwirth, Vincent Baltz Anisotropy of the anomalous Hall effect in the altermagnet candidate Mn5Si3 films
Phys. Rev. B 109, 224430 (2024)
Sonka Reimers, Olena Gomonay, Oliver J. Amin, Filip Krizek, Luke X. Barton Yaryna Lytvynenko, Stuart Poole, Richard P. Campion, Vit Novák, Francesco Maccherozzi, Dina Carbone, Alexander Björling, Yuran Niu, Evangelos Golias, Dominik Kriegner, Jairo Sinova, Mathias Kläui, Martin Jourdan, Sarnjeet S. Dhesi, Kevin W. Edmonds and Peter Wadley Magnetic domain engineering in antiferromagnetic CuMnAs and Mn2Au devices
Phys. Rev. Applied 21, 064030 (2024)
Helena Reichlova, Rafael Lopes Seeger, Rafael González-Hernández, Ismaila Kounta, Richard Schlitz, Dominik Kriegner, Philipp Ritzinger, Michaela Lammel, Miina Leiviskä, Anna Birk Hellenes, Kamil Olejník, Vaclav Petřiček, Petr Doležal, Lukas Horak, Eva Schmoranzerova, Antonín Badura, Sylvain Bertaina, Andy Thomas, Vincent Baltz, Lisa Michez, Jairo Sinova, Sebastian T. B. Goennenwein, Tomáš Jungwirth, Libor Šmejkal Observation of a spontaneous anomalous Hall response in the Mn5Si3 d-wave altermagnet candidate
Nat Commun 15, 4961 (2024)
R. Jaeschke-Ubiergo, V. K. Bharadwaj, L. Šmejkal, Jairo Sinova Supercell Altermagnets
Phys. Rev. B 109, 094425 (2024)
Sonka Reimers, Lukas Odenbreit, Libor Smejkal, Vladimir N. Strocov, Procopios Constantinou, Anna Birk Hellenes, Rodrigo Jaeschke Ubiergo, Warlley H. Campos, Venkata K. Bharadwaj, Atasi Chakraborty, Thiboud Denneulin, Wen Shi, Rafal E. Dunin-Borkowski, Suvadip Das, Mathias Kläui, Jairo Sinova, Martin Jourdan Direct observation of altermagnetic band splitting in CrSb thin films Nat Commun15, 2116 (2024)
J. Krempaský, L. Šmejkal, S.W. D'Souza, M. Hajlaoui, G. Springholz, K. Uhlířová, F. Alarab, P.C. Constantinou, V. Strokov, D. Usanov, W.R. Pudelko, R. González-Hernández, A. Birk Hellenes, Z. Jansa, H. Reichlová, Z. Šobáň, R. D. Gonzalez Betancourt, P. Wadley, Jairo Sinova, D. Kriegner, J. Minár, J.H. Dil, T. Jungwirth Altermagnetic lifting of Kramers spin degeneracy Nature626, 517–522 (2024)
O. Fedchenko, J. Minar, A. Akashdeep, S. W. D'Souza, D. Vasilyev, O. Tkach, L. Odenbreit, Q. L. Nguyen, D. Kutnyakhov, N. Wind, L. Wenthaus, M. Scholz, K. Rossnagel, M. Hoesch, M. Aeschlimann, B. Stadtmueller, M. Klaeui, G. Schoenhense, G. Jakob, T. Jungwirth, Libor Smejkal, Jairo Sinova, H. J. Elmers Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO2
Sci. Adv. 10, eadj4883 (2024)
A. Hariki, T. Yamaguchi, D. Kriegner, K. W. Edmonds, P. Wadley, S. S. Dhesi, G. Springholz, Libor Šmejkal, K. Výborný, T. Jungwirth, J. Kuneš X-ray Magnetic Circular Dichroism in Altermagnetic α-MnTe
Phys. Rev. Lett. 132, 176701 (2024)
Libor Šmejkal, Alberto Marmodoro, Kyo-Hoon Ahn, Rafael Gonzalez-Hernandez, Ilja Turek, Sergiy Mankovsky, Hubert Ebert, Sunil W. D'Souza, Ondřej Šipr, Jairo Sinova and Tomas Jungwirth Chiral magnons in altermagnetic RuO2
Phys. Rev. Lett. 131, 256703 (2023)
Teresa Tschirner, Philipp Keßler, Ruben Dario Gonzalez Betancourt, Tommy Kotte, Dominik Kriegner, Bernd Büchner, Joseph Dufouleur, Martin Kamp, Vedran Jovic, Libor Smejkal, Jairo Sinova, Ralph Claessen, Tomas Jungwirth, Simon Moser, Helena Reichlova and Louis Veyrat Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2
Apl. Mater. 11, 101103 (2023)
Ismaïla Kounta, Helena Reichlova, Dominik Kriegner, Rafael Lopes Seeger, Antonin Bad'ura, Miina Leiviska, Amine Boussadi, Vasile Heresanu, Sylvain Bertaina, Matthieu Petit, Eva Schmoranzerova, Libor Smejkal, Jairo Sinova, Tomas Jungwirth, Vincent Baltz, Sebastian T. B. Goennenwein, and Lisa Michez Competitive actions of MnSi in the epitaxial growth of Mn5Si3 thin films on Si(111)
Phys. Rev. Materials 7, 024416 (2023)
Seo-Jin Kim, Jihang Zhu, Mario M. Piva, Marcus Schmidt, Dorsa Fartab, Andrew P. Mackenzie, Michael Baenitz, Michael Nicklas, Helge Rosner, Ashley M. Cook, Rafael González-Hernández, Libor Šmejkal, Haijing Zhang Observation of the anomalous Hall effect in a layered polar semiconductor
Adv. Sci. 2023, 2307306 (2023)
A. Garrison Linn, Peipei Hao, Kyle N. Gordon, Dushyant Narayan, Bryan S. Berggren, Nathaniel Speiser, Sonka Reimers, Richard P. Campion, Vít Novák, Sarnjeet S. Dhesi, Timur Kim, Cephise Cacho, Libor Šmejkal, Tomáš Jungwirth, Jonathan D. Denlinger, Peter Wadley and Dan Dessau Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs
Quantum Materials 8, 19 (2023)
M. J. Grzybowski, C. F. Schippers, Olena Gomonay, K. Rubi, M. E. Bal, U. Zeitler, A. Kozioł-Rachwał, M. Szpytma, W. Janus, B. Kurowska, S. Kret, M. Gryglas-Borysiewicz, B. Koopmans, and H. J. M. Swagten Antiferromagnetic hysteresis above the spin-flop field
Phys. Rev. B 107 12, L060403 (2023)
Zexin Feng, Xiaorong Zhou, Libor Šmejkal, Lei Wu, Zengwei Zhu, Huixin Guo, Rafael González-Hernández, Xiaoning Wang, Han Yan, Peixin Qin, Xin Zhang, Haojiang Wu, Hongyu Chen, Ziang Meng, Li Liu, Zhengcai Xia, Jairo Sinova, Tomáš Jungwirth and Zhiqi Liu An anomalous Hall effect in altermagnetic ruthenium dioxide
Nature electronics 5, 735-743 (2022)
Shubhankar Das, A. Ross, X. X. Ma, S. Becker, C. Schmitt, F. van Duijn, E. F. Galindez-Ruales, F. Fuhrmann, M.-A. Syskaki, U. Ebels, V. Baltz, A.-L. Barra, H. Y. Chen, G. Jakob, S. X. Cao, Jairo Sinova, Olena Gomonay, R. Lebrun and M. Kläui Anisotropic long-range spin transport in canted antiferromagnetic orthoferrite YFeO3
Nature Communications 13, 6140 (2022)
Hendrik Meer, Olena Gomonay, Christin Schmitt, Rafael Ramos, Leo Schnitzspan, Florian Kronast, Mohamad-Assaad Mawass, Sergio Valencia, Eiji Saitoh, Jairo Sinova, Lorenzo Baldrati and Mathias Kläui Strain-induced Shape Anisotropy in Antiferromagnetic Structures
Phys. Rev. B 106, 094430 (2022)
Libor Smejkal, Allan H. MacDonald, Jairo Sinova, Satoru Nakatsuji and Tomas Jungwirth Anomalous Hall antiferromagnets
Nature Revies Materials 7, 482–496 (2022)
Sonka Reimers, Dominik Kriegner, Olena Gomonay, Dina Carbone, Filip Krizek, Vit Novak, Richard P. Campion, Francesco Maccherozzi, Alexander Bjorling, Oliver J. Amin, Luke X. Barton, Stuart F. Poole, Khalid A. Omari, Jan Michalicka, Ondrej Man, Jairo Sinova, Tomas Jungwirth, Peter Wadley, Sarnjeet S. Dhesi and Kevin W. Edmonds Defect-driven antiferromagnetic domain walls in CuMnAs films
Nature Communications 13, 724 (2022)
Angela Wittmann, Olena Gomonay, Kai Litzius, Allison Kaczmarek, Alexander E. Kossak, Daniel Wolf, Axel Lubk, Tyler N. Johnson, Elizaveta A. Tremsina, Alexandra Churikova, Felix Büttner, Sebastian Wintz, Mohamad-Assaad Mawass, Markus Weigand, Florian Kronast, Larry Scipioni, Adam Shepard, Ty Newhouse-Illige, James A. Greer, Gisela Schütz, Norman O. Birge, and Geoffrey S. D. Beach Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet a-Fe2O3
Phys. Rev. B 106, 224419 (2022)
M. Merte, F. Freimuth, T. Adamantopoulos, D. Go, T. G. Saunderson, M. Kläui, L. Plucinski, Olena Gomonay, S. Blügel, and Y. Mokrousov Photocurrents of charge and spin in monolayer Fe3GeTe2
Phys. Rev. B 104, L220405 (2021)
Jan Schütte-Engel, David J. E. Marsh, Alexander J. Millar, Akihiko Sekine, Francesca Chadha-Day, Sebastian Hoof, Mazhar Ali, Kin-Chung Fong, Edward Hardy and Libor Šmejkal Axion quasiparticles for axion dark matter detection
JCAP 08 066 (2021)
H. J. Elmers, S. V. Chernov, S. W. D’Souza, S. P. Bommanaboyena, S. Yu. Bodnar, K. Medjanik, S. Babenkov, O. Fedchenko, D. Vasilyev, S. Y. Agustsson, C. Schlueter, A. Gloskovskii, Yu. Matveyev, V. N. Strocov, Y. Skourski, L. Šmejkal, Jairo Sinova, J. Minár, M. Kläui, G. Schönhense, and M. Jourdan Néel Vector Induced Manipulation of Valence States in the Collinear Antiferromagnet Mn2Au
ACS NANO 14, (2020)
F. Büttner, B. Pfau, M. Böttcher, M. Schneider, G. Mercurio, C. M. Günther, P. Hessing, C. Klose, A. Wittmann, K. Gerlinger, L.-M. Kern, C. Strüber, C. von Korff Schmising, J. Fuchs, D. Engel, A. Churikova, S. Huang, D. Suzuki, I. Lemesh, M. Huang, L. Caretta, D. Weder, J. H. Gaida, M. Möller, T. R. Harvey, S. Zayko, K. Bagschik, R. Carley, L. Mercadier, J. Schlappa, A. Yaroslavtsev, L. Le Guyarder, N. Gerasimova, A. Scherz, C. Deiter, R. Gort, D. Hickin, J. Zhu, M. Turcato, D. Lomidze, F. Erdinger, A. Castoldi, S. Maffessanti, M. Porro, A. Samartsev, Jairo Sinova, C. Ropers, J. H. Mentink, B. Dupé, G. S. D. Beach, S. Eisebitt Observation of fluctuation-mediated picosecond nucleation of a topological phase
Nature Materials 20, 30-37 (2021)
S. Schott, U. Chopra, V. Lemaur, A. Melnyk, Y. Olivier, R. Di Pietro, I. Romanov, R. L. Carey, X. Jiao, C. Jellett, M. Little, A. Marks, C. R. McNeill, I. McCullouch, E. R. McNellis, D. Andrienko, D. Beljonne, Jairo Sinova, H. Sirringhaus Polaron spin dynamics in high-mobility polymeric semiconductors Nature Physics15, pages 814–822 (2019)
S.-J. Wang, D. Venkateshvaran, M. R. Mahani, U. Chopra, E. R. McNellis, R. Di Pietro, S. Schott, A. Wittmann, G. Schweicher, M. Cubukcu, K. Kang, R. Carey, T. J. Wagner, J. N. M. Siebrecht, D. P. G. H. Wong, I. E. Jacobs, R. O. Aboljadayel, A. Ionescu, S. A. Egorov, S. Mueller, O. Zadvorna, P. Skalski, C. Jellett, M. Little, A. Marks, I. McCulloch, J. Wunderlich, Jairo Sinova, H. Sirringhaus Long spin diffusion lengths in doped conjugated polymers due to enhanced exchange coupling
Nature Electronics 2, 98–107 (2019)
Ciccarelli, C. ; Anderson, L. ; Tshitoyan, V. ; Ferguson, A. J. ; Gerhard, F. ; Gould, C. ; Molenkamp, L. W. ; Gayles, Jacob ; Železný, J. ; Šmejkal, L. ; Yuan, Zhe ; Sinova, Jairo ; Freimuth, F. ; Jungwirth, T. Room-temperature spin-orbit torque in NiMnSb
Nature Physics 12, 855 (2016)
Kurebayashi, H. ; Sinova, Jairo ; Fang, D. ; Irvine, A. C. ; Skinner, T. D. ; Wunderlich, J. ; Novák, V. ; Campion, R. P. ; Gallagher, B. L. ; Vehstedt, E. K. ; Zârbo, L. P. ; Výborný, K. ; Ferguson, A. J. ; Jungwirth, T. An antidamping spin-orbit torque originating from the Berry curvature
Nature Nanotechnology 9, 211 (2014)
Tesařová, N. ; Ostatnický, T. ; Novák, V. ; Olejník, K. ; Šubrt, J. ; Reichlová, H. ; Ellis, C. T. ; Mukherjee, A. ; Lee, J. ; Sipahi, G. M. ; Sinova, Jairo ; Hamrle, J. ; Jungwirth, T. ; Němec, P. ; Černe, J. ; Výborný, K. Systematic study of magnetic linear dichroism and birefringence in (Ga,Mn)As
Physical Review B 89, 085203 (2014)
Mašek, J. ; Máca, F. ; Kudrnovský, J. ; Makarovsky, O. ; Eaves, L. ; Campion, R. P. ; Edmonds, K. W. ; Rushforth, A. W. ; Foxon, C. T. ; Gallagher, B. L. ; Novák, V. ; Sinova, Jairo ; Jungwirth, T. Microscopic analysis of the valence band and impurity band theories of (Ga,Mn)As
Physical Review Letters 105, 227202 (2010)
Wunderlich, Jörg ; Park, Byong-Guk ; Irvine, Andrew C. ; Zârbo, Liviu P. ; Rozkotová, Eva ; Nemec, Petr ; Novák, Vít ; Sinova, Jairo ; Jungwirth, Tomas Spin Hall effect transistor
Science 330, 1801 (2010)
Jungwirth, T. ; Horodyská, P. ; Tesařová, N. ; Němec, P. ; Šubrt, J. ; Malý, P. ; Kužel, P. ; Kadlec, C. ; Mašek, J. ; Němec, I. ; Orlita, M. ; Novák, V. ; Olejník, K. ; Šobáň, Z. ; Vašek, P. ; Svoboda, P. ; Sinova, Jairo Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As
Physical Review Letters 105, 227201 (2010)
Rushforth, A. W. ; Výborný, K. ; King, C. S. ; Edmonds, K. W. ; Campion, R. P. ; Foxon, C. T. ; Wunderlich, J. ; Irvine, A. C. ; Novák, V. ; Olejnik, K. ; Kovalev, A. A. ; Sinova, Jairo ; Jungwirth, T. ; Gallagher, B. L. The origin and control of the sources of AMR in (Ga,Mn)As devices
Journal of Magnetism and Magnetic Materials 321,1001 (2009)
Rushforth, A. W. ; Výborný, K. ; King, C. S. ; Edmonds, K. W. ; Campion, R. P. ; Foxon, C. T. ; Wunderlich, J. ; Irvine, A. C. ; Vašek, P. ; Novák, V. ; Olejník, K. ; Sinova, Jairo ; Jungwirth, T. ; Gallagher, B. L. Anisotropic magnetoresistance components in (Ga,Mn)As
Physical Review Letters 99, 147207 (2007)
Nunner, Tamara S. ; Sinitsyn, N. A. ; Borunda, Mario F. ; Dugaev, V. K. ; Kovalev, A. A. ; Abanov, Ar. ; Timm, Carsten ; Jungwirth, T. ; Inoue, Jun-ichiro ; MacDonald, A. H. ; Sinova, Jairo Anomalous Hall effect in a two-dimensional electron gas
Physical Review B 76, 235312 (2007)
Jungwirth, T. ; Sinova, Jairo ; MacDonald, A. H. ; Gallagher, B. L. ; Novák, V. ; Edmonds, K. W. ; Rushforth, A. W. ; Campion, R. P. ; Foxon, C. T. ; Eaves, L. ; Olejník, K. ; Mašek, J. ; Yang, S-R. Eric ; Wunderlich, J. ; Gould, C. ; Molenkamp, L. W. ; Dietl, T. ; Ohno, H. Character of states near the Fermi level in (Ga,Mn)As : impurity to valence band crossover
Physical Review B 76, 125206 (2007)
König, M. ; Tschetschetkin, A. ; Hankiewicz, E. M. ; Sinova, Jairo ; Hock, V. ; Daumer, V. ; Schäfer, M. ; Becker, C. R. ; Buhmann, H. ; Molenkamp, L. W. Direct observation of the Aharonov-Casher phase
Physical Review Letters 96, 076804 (2006)
Jungwirth, T. ; Mašek, J. ; Wang, K. Y. ; Edmonds, K. W. ; Sawicki, M. ; Polini, M. ; Sinova, Jairo ; MacDonald, A. H. ; Campion, R. P. ; Zhao, L. X. ; Farley, N. R. S. ; Johal, T. K. ; van der Laan, G. ; Foxon, C. T. ; Gallagher, B. L. Low-temperature magnetization of (Ga,Mn)As semiconductors
Physical Review B 73, 165205 (2006)
Giddings, A. D. ; Khalid, M. N. ; Jungwirth, T. ; Wunderlich, J. ; Yasin, S. ; Campion, R. P. ; Edmonds, K. W. ; Sinova, Jairo ; Ito, K. ; Wang, K. Y. ; Williams, D. ; Gallagher, B. L. ; Foxon, C. T. Large tunneling anisotropic magnetoresistance in (Ga,Mn)As nanoconstrictions
Physical Review Letters 94, 127202 (2005)
Wang, K. Y. ; Jungwirth, T. ; Mašek, J. ; Edmonds, K. W. ; König, Jürgen ; Sinova, Jairo ; Polini, M. ; Goncharuk, N. A. ; MacDonald, A. H. ; Sawicki, M. ; Rushforth, A. W. ; Campion, R. P. ; Zhao, L.X. ; Foxon, C.T. ; Gallagher, B.L. Prospects for high temperature ferromagnetism in (Ga,Mn)As semiconductors
Physical Review B 72, 165204 (2005)
Sinova, Jairo ; Culcer, Dimitri ; Niu, Q. ; Sinitsyn, N. A. ; Jungwirth, T. ; MacDonald, A. H. Universal intrinsic spin Hall effect
Physical Review Letters 92, 126603 (2004)
In magnetic metals, the interplay between conduction electrons subject to spin-orbit coupling and localized magnetic moments drive key magnetic effects such as spin-orbit torques. Such spin-orbit induced phenomena are believed to be vital for next generation magnetic memory devices.
LAO/STO interface
We analyse their microscopic origin and develop models that connect with experiments. In particular, we focus on both disorder and the enhanced Rashba spin-orbit coupling at interfaces.
One prominent physical system of interest is the interface between perovskite-type oxides, where recent experiments reveal the important role of spin-orbit-induced effects with respect to the observed magnetic phases. We study the magnetic phases resulting from the interplay between spin-orbit coupling and magnetic exchange interactions via their transport properties. To capture the real-time evolution of these systems in non-equilibrium, we derive diffusion equations directly from quantum kinetic theory.
Antiferromagnets are prospective materials for spintronic applications as they show fast magnetic dynamics, low susceptibility to the magnetic fields and produce no stray fields. They have nontrivial magnetic structure, more magnetic degrees of freedoms and peculiar dynamics, as compared to ferromagnetic materials.
Application of antiferromagnets for information storage and development implies manipulation of states with the use of the magnetic fields or electrical currents. For this one needs to study the mechanisms that govern behaviour of antiferrantiferromagentic nanoparticles and textures in the presence of the external fields. My current reseach is focused on the problems of nonequilibrium magnetic dynamics of antiferromagnets induced by spin-orbit torques, temperature gradients, mechanical stresses etc. Strong magnetoelastic coupling, which is a peculiar feature of many antiferromagnetic materials, makes these problems more complicated and more facinating.
As a teacher I have a great experience in the field of quantum information theory and hope to find a way to use antiferromagnets as the active elements of quantum bits.
Antiferromagnetic spin-texures and dynamics. Part of a collection of reviews on antiferromagnetic spintronics.O. Gomonay, V. Baltz, A. Brataas, Y. Tserkovnyak.(Nature Physics, 14, 213 (2018))
Spin Colossal Magnetoresistance.Zh. Qiu , Dazi Hou, J. Barker , K. Yamamoto, O. Gomonay, and E. Saitoh. (Nature Materials, 17, 577 (2018))
My focus is on the magnetization dynamics in antiferromagnets. These are ordered magnetic materials with microscopically alternating magnetic moments and a zero net one. Antiferromagnets have a number of advantages over ferromagnets, most notably faster magnetization dynamics, insensitivity to disturbing magnetic fields and the absence of stray fields. Even though there is a long way to go, these materials have a strong potential of shaping the technology of the future.
I am currently studying magnetic skyrmions in generic antiferromagnets. There has been no experimental observation of antiferromagnetic skyrmions yet, however, theory allows for their existence. I am using a phenomenological and analytical approach to analyze the current-induced skyrmion motion in a particular class of antiferromagnets.
Publications
“Phenomenology of current-induced skyrmion motion in antiferromagnets”. H. Velkov, O. Gomonay, M. Beens, G. Schwiete, A. Brataas, J. Sinova and R. A. Duine (New J. Phys. 18(2016) 075016)
Spintronics, a combination of spin and electronics, not uses only the electrical charge, but also the intrinsic spin of the electron to process information. Recently, non-collinear chiral magnetic structures called skyrmions have received a lot of interest in the field of spintronics. Magnetic skyrmions are particle-like, highly stable vortical objects, in which the magnetization of the atoms rotates from a ferromagnetic background into the opposite direction in the center of the core.
