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Eremeev SV, Glazkova D, Poelchen G, Kraiker A, Ali K, Tarasov AV, Schulz S, Kliemt K, Chulkov EV, Stolyarov VS, Ernst A, Krellner C, Usachov DY, Vyalikh DV. Insight into the electronic structure of the centrosymmetric skyrmion magnet GdRu 2Si 2. Nanoscale Adv 2023; 5:6678-6687. [PMID: 38024312 PMCID: PMC10662135 DOI: 10.1039/d3na00435j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023]
Abstract
The discovery of a square magnetic-skyrmion lattice in GdRu2Si2, with the smallest so far found skyrmion size and without a geometrically frustrated lattice, has attracted significant attention. In this work, we present a comprehensive study of surface and bulk electronic structures of GdRu2Si2 by utilizing momentum-resolved photoemission (ARPES) measurements and first-principles calculations. We show how the electronic structure evolves during the antiferromagnetic transition when a peculiar helical order of 4f magnetic moments within the Gd layers sets in. A nice agreement of the ARPES-derived electronic structure with the calculated one has allowed us to characterize the features of the Fermi surface (FS), unveil the nested region along kz at the corner of the 3D FS, and reveal their orbital compositions. Our findings suggest that the Ruderman-Kittel-Kasuya-Yosida interaction plays a decisive role in stabilizing the spiral-like order of Gd 4f moments responsible for the skyrmion physics in GdRu2Si2. Our results provide a deeper understanding of electronic and magnetic properties of this material, which is crucial for predicting and developing novel skyrmion-based systems.
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Affiliation(s)
- S V Eremeev
- Institute of Strength Physics and Materials Science, Russian Academy of Sciences 634055 Tomsk Russia
| | - D Glazkova
- St. Petersburg State University 7/9 Universitetskaya Nab. St. Petersburg 199034 Russia
| | - G Poelchen
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden D-01062 Dresden Germany
| | - A Kraiker
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt Max-von-Laue Strasse 1 D-60438 Frankfurt am Main Germany
| | - K Ali
- Department of Microtechnology and Nanoscience, Chalmers University of Technology Göteborg 41296 Sweden
| | - A V Tarasov
- St. Petersburg State University 7/9 Universitetskaya Nab. St. Petersburg 199034 Russia
- Moscow Institute of Physics and Technology Institute Lane 9, Dolgoprudny Russia
| | - S Schulz
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden D-01062 Dresden Germany
| | - K Kliemt
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt Max-von-Laue Strasse 1 D-60438 Frankfurt am Main Germany
| | - E V Chulkov
- St. Petersburg State University 7/9 Universitetskaya Nab. St. Petersburg 199034 Russia
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU 20080 San Sebastián/Donostia Spain
- Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU 20018 San Sebastián/Donostia Spain
- Donostia International Physics Center (DIPC) 20018 Donostia-San Sebastián Spain
| | - V S Stolyarov
- Moscow Institute of Physics and Technology Institute Lane 9, Dolgoprudny Russia
- Dukhov Research Institute of Automatics (VNIIA) Moscow 127055 Russia
- National University of Science and Technology MISIS Moscow 119049 Russia
| | - A Ernst
- Institute for Theoretical Physics, Johannes Kepler University Linz Austria
| | - C Krellner
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt Max-von-Laue Strasse 1 D-60438 Frankfurt am Main Germany
| | - D Yu Usachov
- St. Petersburg State University 7/9 Universitetskaya Nab. St. Petersburg 199034 Russia
- Moscow Institute of Physics and Technology Institute Lane 9, Dolgoprudny Russia
- National University of Science and Technology MISIS Moscow 119049 Russia
| | - D V Vyalikh
- Donostia International Physics Center (DIPC) 20018 Donostia-San Sebastián Spain
- IKERBASQUE, Basque Foundation for Science 48011 Bilbao Spain
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Poelchen G, Hellwig J, Peters M, Usachov DY, Kliemt K, Laubschat C, Echenique PM, Chulkov EV, Krellner C, Parkin SSP, Vyalikh DV, Ernst A, Kummer K. Long-lived spin waves in a metallic antiferromagnet. Nat Commun 2023; 14:5422. [PMID: 37669952 PMCID: PMC10480465 DOI: 10.1038/s41467-023-40963-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 08/17/2023] [Indexed: 09/07/2023] Open
Abstract
Collective spin excitations in magnetically ordered crystals, called magnons or spin waves, can serve as carriers in novel spintronic devices with ultralow energy consumption. The generation of well-detectable spin flows requires long lifetimes of high-frequency magnons. In general, the lifetime of spin waves in a metal is substantially reduced due to a strong coupling of magnons to the Stoner continuum. This makes metals unattractive for use as components for magnonic devices. Here, we present the metallic antiferromagnet CeCo2P2, which exhibits long-living magnons even in the terahertz (THz) regime. For CeCo2P2, our first-principle calculations predict a suppression of low-energy spin-flip Stoner excitations, which is verified by resonant inelastic X-ray scattering measurements. By comparison to the isostructural compound LaCo2P2, we show how small structural changes can dramatically alter the electronic structure around the Fermi level leading to the classical picture of the strongly damped magnons intrinsic to metallic systems. Our results not only demonstrate that long-lived magnons in the THz regime can exist in bulk metallic systems, but they also open a path for an efficient search for metallic magnetic systems in which undamped THz magnons can be excited.
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Affiliation(s)
- G Poelchen
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043, Grenoble, France.
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany.
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.
| | - J Hellwig
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, 60438, Frankfurt am Main, Germany
| | - M Peters
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, 60438, Frankfurt am Main, Germany
| | - D Yu Usachov
- Donostia International Physics Center (DIPC), 20018, Donostia-San Sebastián, Spain
| | - K Kliemt
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, 60438, Frankfurt am Main, Germany
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - P M Echenique
- Donostia International Physics Center (DIPC), 20018, Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Spain
| | - E V Chulkov
- Donostia International Physics Center (DIPC), 20018, Donostia-San Sebastián, Spain
- Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018, Donostia-San Sebastián, Spain
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, 20080, Donostia-San Sebastián, Spain
| | - C Krellner
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, 60438, Frankfurt am Main, Germany
| | - S S P Parkin
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120, Halle, Germany
| | - D V Vyalikh
- Donostia International Physics Center (DIPC), 20018, Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Spain
| | - A Ernst
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120, Halle, Germany
- Institut für Theoretische Physik, Johannes Kepler Universität, 4040, Linz, Austria
| | - K Kummer
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043, Grenoble, France.
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Usachov DY, Tarasov AV, Glazkova D, Mende M, Schulz S, Poelchen G, Fedorov AV, Vilkov OY, Bokai KA, Stolyarov VS, Kliemt K, Krellner C, Vyalikh DV. Insight into the Temperature-Dependent Canting of 4f Magnetic Moments from 4f Photoemission. J Phys Chem Lett 2023:5537-5545. [PMID: 37294735 DOI: 10.1021/acs.jpclett.3c01276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The orientation of the 4f moments offers an additional degree of freedom for engineering the spin-related properties in spintronic nanostructures of lanthanides. Yet, precise monitoring of the direction of magnetic moments remains a challenge. Here, on the example of the antiferromagnets HoRh2Si2 and DyRh2Si2, we investigate the temperature-dependent canting of the 4f moments near the surface. We demonstrate that this canting can be understood in the framework of crystal electric field theory and the exchange magnetic interaction. Using photoelectron spectroscopy, we disclose subtle but certain temperature-dependent changes in the line shape of the 4f multiplet. These changes are directly linked to the canting of the 4f moments, which is different for the individual lanthanide layers near the surface. Our results illustrate the opportunity to monitor the orientation of the 4f-moments with high precision, which is essential for development of novel lanthanide-based nanostructures, interfaces, supramolecular complexes, and single-molecule magnets for various applications.
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Affiliation(s)
- D Yu Usachov
- St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
- Moscow Institute of Physics and Technology, Institute Lane 9, Dolgoprudny, 141701, Russia
- National University of Science and Technology MISIS, Moscow, 119049, Russia
| | - A V Tarasov
- St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
- Moscow Institute of Physics and Technology, Institute Lane 9, Dolgoprudny, 141701, Russia
| | - D Glazkova
- St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
| | - M Mende
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Dresden D-01062, Germany
| | - S Schulz
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Dresden D-01062, Germany
| | - G Poelchen
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Dresden D-01062, Germany
| | - A V Fedorov
- Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin 12489, Germany
| | - O Yu Vilkov
- St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
| | - K A Bokai
- St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
| | - V S Stolyarov
- Moscow Institute of Physics and Technology, Institute Lane 9, Dolgoprudny, 141701, Russia
- National University of Science and Technology MISIS, Moscow, 119049, Russia
- Dukhov Research Institute of Automatics (VNIIA), Moscow, 127055, Russia
| | - K Kliemt
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt am Main, Germany
| | - C Krellner
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt am Main, Germany
| | - D V Vyalikh
- Donostia International Physics Center (DIPC), 20018 Donostia/San Sebastián, Basque Country, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48013, Spain
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Fedorov AV, Poelchen G, Eremeev SV, Schulz S, Generalov A, Polley C, Laubschat C, Kliemt K, Kaya N, Krellner C, Chulkov EV, Kummer K, Usachov DY, Ernst A, Vyalikh DV. Insight into the Temperature Evolution of Electronic Structure and Mechanism of Exchange Interaction in EuS. J Phys Chem Lett 2021; 12:8328-8334. [PMID: 34428055 DOI: 10.1021/acs.jpclett.1c02274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Discovered in 1962, the divalent ferromagnetic semiconductor EuS (TC = 16.5 K, Eg = 1.65 eV) has remained constantly relevant to the engineering of novel magnetically active interfaces, heterostructures, and multilayer sequences and to combination with topological materials. Because detailed information on the electronic structure of EuS and, in particular, its evolution across TC is not well-represented in the literature but is essential for the development of new functional systems, the present work aims at filling this gap. Our angle-resolved photoemission measurements complemented with first-principles calculations demonstrate how the electronic structure of EuS evolves across a paramagnetic-ferromagnetic transition. Our results emphasize the importance of the strong Eu 4f-S 3p mixing for exchange-magnetic splittings of the sulfur-derived bands as well as coupling between f and d orbitals of neighboring Eu atoms to derive the value of TC accurately. The 4f-3p mixing facilitates the coupling between 4f and 5d orbitals of neighboring Eu atoms, which mainly governs the exchange interaction in EuS.
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Affiliation(s)
- A V Fedorov
- Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
| | - G Poelchen
- Institut für Festkörper- und Materialphysik, TU Dresden, 01069 Dresden, Germany
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | - S V Eremeev
- Institute of Strength Physics and Materials Science, 634055 Tomsk, Russia
| | - S Schulz
- Institut für Festkörper- und Materialphysik, TU Dresden, 01069 Dresden, Germany
| | - A Generalov
- Max IV Laboratory, Lund University, Box 118, 22100 Lund, Sweden
| | - C Polley
- Max IV Laboratory, Lund University, Box 118, 22100 Lund, Sweden
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, TU Dresden, 01069 Dresden, Germany
| | - K Kliemt
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - N Kaya
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - C Krellner
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - E V Chulkov
- Tomsk State University, 634050 Tomsk, Russia
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, 20080 San Sebastián/Donostia, Spain
- Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 San Sebastián/Donostia, Spain
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
- St. Petersburg State University, St. Petersburg, 199034, Russia
| | - K Kummer
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | - D Yu Usachov
- St. Petersburg State University, St. Petersburg, 199034, Russia
| | - A Ernst
- Institut für Theoretische Physik, Johannes Kepler Universität, A 4040 Linz, Austria
- Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany
| | - D V Vyalikh
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
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5
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Usachov DY, Nechaev IA, Poelchen G, Güttler M, Krasovskii EE, Schulz S, Generalov A, Kliemt K, Kraiker A, Krellner C, Kummer K, Danzenbächer S, Laubschat C, Weber AP, Sánchez-Barriga J, Chulkov EV, Santander-Syro AF, Imai T, Miyamoto K, Okuda T, Vyalikh DV. Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials. Phys Rev Lett 2020; 124:237202. [PMID: 32603174 DOI: 10.1103/physrevlett.124.237202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 04/13/2020] [Accepted: 05/19/2020] [Indexed: 06/11/2023]
Abstract
Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemission current from the Si-terminated surface of the antiferromagnet TbRh_{2}Si_{2} and their analysis within an ab initio one-step theory unveil an unusual triple winding of the electron spin along the fourfold-symmetric constant energy contours of the surface states. A two-band k·p model is presented that yields the triple winding as a cubic Rashba effect. The curious in-plane spin-momentum locking is remarkably robust and remains intact across a paramagnetic-antiferromagnetic transition in spite of spin-orbit interaction on Rh atoms being considerably weaker than the out-of-plane exchange field due to the Tb 4f moments.
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Affiliation(s)
- D Yu Usachov
- St. Petersburg State University, 7/9 Universitetskaya Naberezhnaya, St. Petersburg, 199034, Russia
| | - I A Nechaev
- Department of Electricity and Electronics, FCT-ZTF, UPV-EHU, 48080 Bilbao, Spain
| | - G Poelchen
- Institut für Festkörperphysik und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - M Güttler
- Institut für Festkörperphysik und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - E E Krasovskii
- Donostia International Physics Center (DIPC), 20018 Donostia/San Sebastián, Basque Country, Spain
- Departamento de Física de Materiales UPV/EHU, 20080 Donostia/San Sebastián, Basque Country, Spain
- IKERBASQUE, Basque Foundation for Science, 48013, Bilbao, Spain
| | - S Schulz
- Institut für Festkörperphysik und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - A Generalov
- Max IV Laboratory, Lund University, Box 118, 22100 Lund, Sweden
| | - K Kliemt
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt am Main, Germany
| | - A Kraiker
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt am Main, Germany
| | - C Krellner
- Kristall- und Materiallabor, Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt am Main, Germany
| | - K Kummer
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble, France
| | - S Danzenbächer
- Institut für Festkörperphysik und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - C Laubschat
- Institut für Festkörperphysik und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - A P Weber
- Donostia International Physics Center (DIPC), 20018 Donostia/San Sebastián, Basque Country, Spain
| | - J Sánchez-Barriga
- Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - E V Chulkov
- St. Petersburg State University, 7/9 Universitetskaya Naberezhnaya, St. Petersburg, 199034, Russia
- Donostia International Physics Center (DIPC), 20018 Donostia/San Sebastián, Basque Country, Spain
- Departamento de Física de Materiales UPV/EHU, 20080 Donostia/San Sebastián, Basque Country, Spain
- Centro de Física de Materiales CFM-MPC and Centro Mixto CSIC-UPV/EHU, 20018 Donostia/San Sebastián, Basque Country, Spain
- Tomsk State University, Lenina Avenue 36, 634050, Tomsk, Russia
| | - A F Santander-Syro
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
| | - T Imai
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - K Miyamoto
- Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
| | - T Okuda
- Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
| | - D V Vyalikh
- Donostia International Physics Center (DIPC), 20018 Donostia/San Sebastián, Basque Country, Spain
- IKERBASQUE, Basque Foundation for Science, 48013, Bilbao, Spain
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