TY - JOUR AU - Nagyfalusi, Balázs AU - Szunyogh, László AU - Palotás, Krisztián TI - Real-space nonlocal Gilbert damping from exchange torque correlation applied to bulk ferromagnets and their surfaces JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 109 PY - 2024 IS - 9 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.109.094417 UR - https://m2.mtmt.hu/api/publication/34749016 ID - 34749016 LA - English DB - MTMT ER - TY - JOUR AU - Nagyfalusi, Balázs AU - Udvardi, László AU - Szunyogh, László AU - Rózsa, Levente TI - Chemical potential of magnetic skyrmion quasiparticles in heavy-metal/iron bilayers JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 109 PY - 2024 IS - 9 PG - 9 SN - 2469-9950 DO - 10.1103/PhysRevB.109.094418 UR - https://m2.mtmt.hu/api/publication/34749006 ID - 34749006 LA - English DB - MTMT ER - TY - JOUR AU - Beck, P. AU - Nyári, Bendegúz Tamás AU - Schneider, L. AU - Rózsa, Levente AU - Lászlóffy, András AU - Palotás, Krisztián AU - Szunyogh, László AU - Ujfalussy, Balázs AU - Wiebe, J. AU - Wiesendanger, R. TI - Search for large topological gaps in atomic spin chains on proximitized superconducting heavy-metal layers JF - COMMUNICATIONS PHYSICS J2 - COMM PHYS VL - 6 PY - 2023 IS - 1 PG - 10 SN - 2399-3650 DO - 10.1038/s42005-023-01196-y UR - https://m2.mtmt.hu/api/publication/33887288 ID - 33887288 LA - English DB - MTMT ER - TY - JOUR AU - Dannegger, Tobias AU - Deák, András AU - Rózsa, Levente AU - Galindez-Ruales, E. AU - Das, Shubhankar AU - Baek, Eunchong AU - Klaeui, Mathias AU - Szunyogh, László AU - Nowak, Ulrich TI - Magnetic properties of hematite revealed by an ab initio parameterized spin model JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 18 PG - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.107.184426 UR - https://m2.mtmt.hu/api/publication/34011109 ID - 34011109 N1 - Export Date: 08 March 2024 AB - Hematite is a canted antiferromagnetic insulator, promising for applications in spintronics. Here we present ab initio calculations of the tensorial exchange interactions of hematite and use them to understand its magnetic properties by parametrizing a semiclassical Heisenberg spin model. Using atomistic spin dynamics simulations, we calculate the equilibrium properties and phase transitions of hematite, most notably the Morin transition. The computed isotropic and Dzyaloshinskii-Moriya interactions result in a Neel temperature and weak ferromagnetic canting angle that are in good agreement with experimental measurements. Our simulations show how dipoledipole interactions act in a delicate balance with first and higher-order on-site anisotropies to determine the material's magnetic phase. Comparison with spin-Hall magnetoresistance measurements on a hematite single crystal reveals deviations of the critical behavior at low temperatures. Based on a mean-field model, we argue that these differences result from the quantum nature of the fluctuations that drive the phase transitions. LA - English DB - MTMT ER - TY - JOUR AU - Lászlóffy, András AU - Nyári, Bendegúz Tamás AU - Szunyogh, László AU - Park, K. AU - Ujfalussy, Balázs TI - Classification of Yu-Shiba-Rusinov states of magnetic impurities on superconducting surfaces: A fully relativistic first-principles study JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 22 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.107.224515 UR - https://m2.mtmt.hu/api/publication/34069735 ID - 34069735 LA - English DB - MTMT ER - TY - JOUR AU - Lászlóffy, András AU - Nyári, Bendegúz Tamás AU - Csire, Gábor AU - Szunyogh, László AU - Ujfalussy, Balázs TI - Topological superconductivity from first principles. II. Effects from manipulation of spin spirals: Topological fragmentation, braiding, and quasi-Majorana bound states JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 13 PG - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.108.134513 UR - https://m2.mtmt.hu/api/publication/34394425 ID - 34394425 LA - English DB - MTMT ER - TY - JOUR AU - Martínez-Carracedo, G. AU - Oroszlány, László AU - García-Fuente, A. AU - Nyári, Bendegúz Tamás AU - Udvardi, László AU - Szunyogh, László AU - Ferrer, J. TI - Relativistic magnetic interactions from nonorthogonal basis sets JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 21 PG - 18 SN - 2469-9950 DO - 10.1103/PhysRevB.108.214418 UR - https://m2.mtmt.hu/api/publication/34470105 ID - 34470105 LA - English DB - MTMT ER - TY - JOUR AU - Martínez-Carracedo, Gabriel AU - Oroszlány, László AU - García-Fuente, Amador AU - Szunyogh, László AU - Ferrer, Jaime TI - Electrically driven singlet-triplet transition in triangulene spin-1 chains JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 3 PG - 5 SN - 2469-9950 DO - 10.1103/PhysRevB.107.035432 UR - https://m2.mtmt.hu/api/publication/33644685 ID - 33644685 LA - English DB - MTMT ER - TY - JOUR AU - Nyári, Bendegúz Tamás AU - Lászlóffy, András AU - Csire, Gábor AU - Szunyogh, László AU - Ujfalussy, Balázs TI - Topological superconductivity from first principles. I. Shiba band structure and topological edge states of artificial spin chains JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 13 PG - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.108.134512 UR - https://m2.mtmt.hu/api/publication/34394419 ID - 34394419 LA - English DB - MTMT ER - TY - JOUR AU - Park, K. AU - Nyári, Bendegúz Tamás AU - Lászlóffy, András AU - Szunyogh, László AU - Ujfalussy, Balázs TI - Effects of strong spin-orbit coupling on Shiba states from magnetic adatoms using first-principles theory JF - NEW JOURNAL OF PHYSICS J2 - NEW J PHYS VL - 25 PY - 2023 IS - 3 PG - 19 SN - 1367-2630 DO - 10.1088/1367-2630/acc1ff UR - https://m2.mtmt.hu/api/publication/33728446 ID - 33728446 LA - English DB - MTMT ER - TY - JOUR AU - Deák, András AU - Jackson, J. AU - Nyári, Bendegúz Tamás AU - Szunyogh, László TI - Incommensurate magnetic ordering in CrB2 JF - JOURNAL OF PHYSICS-CONDENSED MATTER J2 - J PHYS CONDENS MAT VL - 34 PY - 2022 IS - 47 PG - 8 SN - 0953-8984 DO - 10.1088/1361-648X/ac94b0 UR - https://m2.mtmt.hu/api/publication/33156870 ID - 33156870 LA - English DB - MTMT ER - TY - JOUR AU - dos Santos Dias, M AU - Brinker, S. AU - Lászlóffy, András AU - Nyári, Bendegúz Tamás AU - Blügel, S. AU - Szunyogh, László AU - Lounis, S. TI - Reply to "comment on 'Proper and improper chiral magnetic interactions' " JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 105 PY - 2022 IS - 2 PG - 4 SN - 2469-9950 DO - 10.1103/PhysRevB.105.026402 UR - https://m2.mtmt.hu/api/publication/32643405 ID - 32643405 LA - English DB - MTMT ER - TY - JOUR AU - Lo Conte, R. AU - Bazarnik, M. AU - Palotás, Krisztián AU - Rózsa, Levente AU - Szunyogh, László AU - Kubetzka, A. AU - Von Bergmann, K. AU - Wiesendanger, R. TI - Coexistence of antiferromagnetism and superconductivity in Mn/Nb(110) JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 105 PY - 2022 IS - 10 PG - 6 SN - 2469-9950 DO - 10.1103/PhysRevB.105.L100406 UR - https://m2.mtmt.hu/api/publication/32775067 ID - 32775067 LA - English DB - MTMT ER - TY - JOUR AU - Nagyfalusi, Balázs AU - Udvardi, László AU - Szunyogh, László TI - Magnetic ground state of supported monatomic Fe chains from first principles JF - JOURNAL OF PHYSICS-CONDENSED MATTER J2 - J PHYS CONDENS MAT VL - 34 PY - 2022 IS - 39 PG - 10 SN - 0953-8984 DO - 10.1088/1361-648X/ac8260 UR - https://m2.mtmt.hu/api/publication/33041619 ID - 33041619 AB - A new computational scheme is presented based on a combination of the conjugate gradient and the Newton-Raphson method to self-consistently minimize the energy within local spin-density functional theory, thus to identify the ground state magnetic order of a finite cluster of atoms. The applicability of the new ab initio optimization method is demonstrated for Fe chains deposited on different metallic substrates. The optimized magnetic ground states of the Fe chains on Rh(111) are analyzed in details and a good comparison is found with those obtained from an extended Heisenberg model containing first principles based interaction parameters. Moreover, the effect of the different bilinear spin-spin interactions in the formation of the magnetic ground states is monitored. In case of Fe chains on Nb(110) spin-spiral configurations with opposite rotational sense are found as compared to previous spin-model results which hints on the importance of higher order chiral interactions. The wavelength of the spin-spiral states of Fe chains on Re(0001) was obtained in good agreement with scanning tunneling microscopy experiments. LA - English DB - MTMT ER - TY - JOUR AU - Selzer, Severin AU - Salemi, Leandro AU - Deák, András AU - Simon, Eszter AU - Szunyogh, László AU - Oppeneer, Peter M. AU - Nowak, Ulrich TI - Current-induced switching of antiferromagnetic order in Mn2Au from first principles JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 105 PY - 2022 IS - 17 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.105.174416 UR - https://m2.mtmt.hu/api/publication/32923926 ID - 32923926 AB - It is well established that it is possible to switch certain antiferromagnets electrically, yet the interplay of Neel-spin-orbit torques and thermal activation is only poorly understood. Combining ab initio calculations and atomistic spin dynamics simulations we develop a multiscale model to study the current-induced switching in Mn2Au. We compute from first principles the strength and direction of the electrically induced magnetic moments, caused by the Rashba-Edelstein effect, and take these into account in atomistic spin dynamics simulations. Our simulations reveal the switching paths as well as the timescales for switching. The size of the induced moments, however, turns out to be insufficient to lead to fully deterministic switching. Instead, we find that a certain degree of thermal activation is required to help overcome the relevant energy barrier. LA - English DB - MTMT ER - TY - JOUR AU - Abrudan, Radu AU - Hennecke, Martin AU - Radu, Florin AU - Kachel, Torsten AU - Holldack, Karsten AU - Mitzner, Rolf AU - Donges, Andreas AU - Khmelevskyi, Sergii AU - Deák, András AU - Szunyogh, László AU - Nowak, Ulrich AU - Eisebitt, Stefan AU - Radu, Ilie TI - Element‐Specific Magnetization Damping in Ferrimagnetic DyCo 5 Alloys Revealed by Ultrafast X‐ray Measurements JF - PHYSICA STATUS SOLIDI - RAPID RESEARCH LETTERS J2 - PHYS STATUS SOLIDI-R VL - 15 PY - 2021 IS - 8 SN - 1862-6254 DO - 10.1002/pssr.202100047 UR - https://m2.mtmt.hu/api/publication/32008881 ID - 32008881 N1 - Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Str. 15, Berlin, 12489, Germany Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, Berlin, 12489, Germany Fachbereich Physik, Universität Konstanz, Universitätsstraß e 10, Konstanz, 78457, Germany Research Center for Computational Materials Science and Engineering, Vienna University of Technology, Karlsplatz 13, Vienna, A-1040, Austria Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, H-1111, Hungary MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budafoki út 8, Budapest, H-1111, Hungary Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, Berlin, 10623, Germany Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, Berlin, 14195, Germany Export Date: 13 May 2021 Correspondence Address: Radu, I.; Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, Germany; email: radu@mbi-berlin.de Correspondence Address: Radu, I.; Fachbereich Physik, Arnimallee 14, Germany; email: radu@mbi-berlin.de Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Str. 15, Berlin, 12489, Germany Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, Berlin, 12489, Germany Fachbereich Physik, Universität Konstanz, Universitätsstraß e 10, Konstanz, 78457, Germany Research Center for Computational Materials Science and Engineering, Vienna University of Technology, Karlsplatz 13, Vienna, A-1040, Austria Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, H-1111, Hungary MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budafoki út 8, Budapest, H-1111, Hungary Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, Berlin, 10623, Germany Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, Berlin, 14195, Germany Export Date: 22 September 2021 Correspondence Address: Radu, I.; Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, Germany; email: radu@mbi-berlin.de LA - English DB - MTMT ER - TY - JOUR AU - Beck, P AU - Schneider, L AU - Rózsa, Levente AU - Palotás, Krisztián AU - Lászlóffy, András AU - Szunyogh, László AU - Wiebe, J AU - Wiesendanger, R TI - Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers JF - NATURE COMMUNICATIONS J2 - NAT COMMUN VL - 12 PY - 2021 IS - 1 PG - 9 SN - 2041-1723 DO - 10.1038/s41467-021-22261-6 UR - https://m2.mtmt.hu/api/publication/31960740 ID - 31960740 LA - English DB - MTMT ER - TY - JOUR AU - dos Santos Dias, M. AU - Brinker, S. AU - Lászlóffy, András AU - Nyári, Bendegúz Tamás AU - Blügel, S. AU - Szunyogh, László AU - Lounis, S. TI - Proper and improper chiral magnetic interactions JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 103 PY - 2021 IS - 14 PG - 5 SN - 2469-9950 DO - 10.1103/PhysRevB.103.L140408 UR - https://m2.mtmt.hu/api/publication/32025792 ID - 32025792 LA - English DB - MTMT ER - TY - JOUR AU - Lászlóffy, András AU - Palotás, Krisztián AU - Rózsa, Levente AU - Szunyogh, László TI - Electronic and magnetic properties of building blocks of mn and fe atomic chains on nb(110) JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 11 PY - 2021 IS - 8 PG - 19 SN - 2079-4991 DO - 10.3390/nano11081933 UR - https://m2.mtmt.hu/api/publication/32169176 ID - 32169176 LA - English DB - MTMT ER - TY - JOUR AU - Nyári, Bendegúz Tamás AU - Lászlóffy, András AU - Szunyogh, László AU - Csire, G AU - Park, K AU - Ujfalussy, Balázs TI - Relativistic first-principles theory of Yu-Shiba-Rusinov states applied to Mn adatoms and Mn dimers on Nb(110) JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 104 PY - 2021 IS - 23 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.104.235426 UR - https://m2.mtmt.hu/api/publication/32575599 ID - 32575599 AB - We present a fully relativistic first-principles-based theoretical approach for the calculation of the spectral properties of magnetic impurities on the surface of a superconducting substrate, providing a material specific framework for the investigation of the Yu-Shiba-Rusinov (YSR) states. By using a suitable orbital decomposition of the local densities of states we discuss in great detail the formation of the YSR states for an Mn adatom and for two kinds of Mn dimers placed on the Nb(110) surface and compare our results to recent experimental findings. In the case of the adatom we find that the spin-orbit coupling slightly shifts some of the YSR peaks and also the local spin polarization on the Nb atoms has marginal effects on their positions. Moreover, by scaling the exchange field on the Mn site we could explain the lack of the dx(2)-y(2)-like YSR state in the spectrum. While our results for a close packed ferromagnetic dimer are in satisfactory agreement with the experimentally observed splitting of the YSR states, in the case of an antiferromagnetic dimer we find that the spin-orbit coupling is not sufficiently large to explain the splitting of the YSR states seen in the experiment. Changing the relative orientation of the magnetic moments in this dimer induces splitting of the YSR states and also shifts their energy, leading even to the formation of a zero bias peak in the case of the deepest YSR state. LA - English DB - MTMT ER -