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4 results on '"Kliemt, Kristin"'

1. Long-lived spin waves in a metallic antiferromagnet

Author

German Research Foundation, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Max Planck Society, European Commission, Poelchen, Georg, Hellwig, Johannes, Peters, Marius, Usachov, Dmitry Yu., Kliemt, Kristin, Laubschat, Clemens, Echenique, Pedro M., Chulkov, Eugene V., Krellner, Cornelius, Parkin, S. S. P., Vyalikh, Denis V., Ernst, Arthur, Kummer, Kurt, German Research Foundation, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Max Planck Society, European Commission, Poelchen, Georg, Hellwig, Johannes, Peters, Marius, Usachov, Dmitry Yu., Kliemt, Kristin, Laubschat, Clemens, Echenique, Pedro M., Chulkov, Eugene V., Krellner, Cornelius, Parkin, S. S. P., Vyalikh, Denis V., Ernst, Arthur, and Kummer, Kurt

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.

Published
2023

2. Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2

Author

German Research Foundation, Ministerio de Economía y Competitividad (España), Saint Petersburg State University, Tomsk State University, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Seiro, Silvia [0000-0001-5400-745X], Kliemt, Kristin [0000-0001-7415-4158], Kim, Timur [0000-0003-4201-4462], Dudin, Pavel [0000-0002-5971-0395], Geibel, Christoph [0000-0002-9694-4174], Krellner, Cornelius [0000-0002-0671-7729], Schulz, Susanne, Nechaev, I. A., Güttler, Monika, Poelchen, Georg, Generalov, Alexander, Danzenbächer, Steffen, Chikina, Alla, Seiro, Silvia, Kliemt, Kristin, Vyazovskaya, Alexandra Yu., Kim, Timur, Dudin, Pavel, Chulkov, Eugene V., Laubschat, Clemens, Krasovskii, E. E., Geibel, Christoph, Krellner, Cornelius, Kummer, Kurt, Vyalikh, Denis V., German Research Foundation, Ministerio de Economía y Competitividad (España), Saint Petersburg State University, Tomsk State University, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Seiro, Silvia [0000-0001-5400-745X], Kliemt, Kristin [0000-0001-7415-4158], Kim, Timur [0000-0003-4201-4462], Dudin, Pavel [0000-0002-5971-0395], Geibel, Christoph [0000-0002-9694-4174], Krellner, Cornelius [0000-0002-0671-7729], Schulz, Susanne, Nechaev, I. A., Güttler, Monika, Poelchen, Georg, Generalov, Alexander, Danzenbächer, Steffen, Chikina, Alla, Seiro, Silvia, Kliemt, Kristin, Vyazovskaya, Alexandra Yu., Kim, Timur, Dudin, Pavel, Chulkov, Eugene V., Laubschat, Clemens, Krasovskii, E. E., Geibel, Christoph, Krellner, Cornelius, Kummer, Kurt, and Vyalikh, Denis V.

Abstract

The development of materials that are non-magnetic in the bulk but exhibit two-dimensional (2D) magnetism at the surface is at the core of spintronics applications. Here, we present the valence-fluctuating material EuIrSi, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent mixed valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface. Our findings disclose valence-fluctuating rare-earth based materials as a very promising basis for the development of systems with controllable 2D magnetic properties which is of interest both for fundamental science and applications.

Published
2019

3. Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2.

Author

Schulz, Susanne, Nechaev, Ilya A., Güttler, Monika, Poelchen, Georg, Generalov, Alexander, Danzenbächer, Steffen, Chikina, Alla, Seiro, Silvia, Kliemt, Kristin, Vyazovskaya, Alexandra Yu., Kim, Timur K., Dudin, Pavel, Chulkov, Evgueni V., Laubschat, Clemens, Krasovskii, Eugene E., Geibel, Christoph, Krellner, Cornelius, Kummer, Kurt, and Vyalikh, Denis V.

Subjects
FERROMAGNETISM, SPIN-orbit interactions, SPINTRONICS, RASHBA effect, MAGNETIC properties
Abstract

The development of materials that are non-magnetic in the bulk but exhibit two-dimensional (2D) magnetism at the surface is at the core of spintronics applications. Here, we present the valence-fluctuating material EuIr2Si2, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent mixed valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface. Our findings disclose valence-fluctuating rare-earth based materials as a very promising basis for the development of systems with controllable 2D magnetic properties which is of interest both for fundamental science and applications. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2.

Author

Schulz, Susanne, Nechaev, Ilya A., Güttler, Monika, Poelchen, Georg, Generalov, Alexander, Danzenbächer, Steffen, Chikina, Alla, Seiro, Silvia, Kliemt, Kristin, Vyazovskaya, Alexandra Yu., Kim, Timur K., Dudin, Pavel, Chulkov, Evgueni V., Laubschat, Clemens, Krasovskii, Eugene E., Geibel, Christoph, Krellner, Cornelius, Kummer, Kurt, and Vyalikh, Denis V.

Subjects
FERROMAGNETISM, SPIN-orbit interactions, SPIN polarization, MAGNETISM, ELECTRONS
Abstract

The development of materials that are non-magnetic in the bulk but exhibit two-dimensional (2D) magnetism at the surface is at the core of spintronics applications. Here, we present the valence-fluctuating material EuIr2Si2, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent mixed valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface. Our findings disclose valence-fluctuating rare-earth based materials as a very promising basis for the development of systems with controllable 2D magnetic properties which is of interest both for fundamental science and applications. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
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