Skokov, Konstantin P. ; Karpenkov, A. Y. ; Karpenkov, D. Y. ; Radulov, Iliya A. ; Günzing, D. ; Eggert, Benedikt ; Rogalev, A. ; Wilhelm, F. ; Liu, J. ; Shao, Y. ; Ollefs, Katharina ; Gruner, M. E. ; Wende, Heiko ; Gutfleisch, Oliver (2023)
A multi-stage, first-order phase transition in LaFe11.8Si1.2: interplay between the structural, magnetic, and electronic degrees of freedom.
In: Applied Physics Reviews, 10 (3)
doi: 10.1063/5.0133411
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Alloys with a first-order magnetic transition are central to solid-state refrigeration technology, sensors and actuators, or spintronic devices. The discontinuous nature of the transition in these materials is a consequence of the coupling between the magnetic, electronic, and structural subsystems, and such transition can, in principle, cross several metastable states, where at one point, the transition takes place within the magnetic subsystem, while at another, the changes occur in the structural or electronic subsystems. To address this issue, we conducted simultaneous measurements of the macroscopic properties—magnetization, temperature change of the sample, longitudinal, and transversal magnetostrictions—to reveal the rich details of the magneto-structural, first-order transition occurring in the prototypical alloy LaFe11.8Si1.2. We found that the transition does not complete in one but in two distinct stages. The presence of the intermediate state changes the potential-energy landscape, which then impacts strongly on the width of the hysteresis associated with the first-order transition. We complement these findings with experiments on the atomistic scale, i.e., x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and Mössbauer spectroscopy, and then combine them with first-principles calculations to reveal the full complexity and two-stage nature of the transition. This new approach can be successfully extended to a large class of advanced magnetic materials that exhibit analogous transformations.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Skokov, Konstantin P. ; Karpenkov, A. Y. ; Karpenkov, D. Y. ; Radulov, Iliya A. ; Günzing, D. ; Eggert, Benedikt ; Rogalev, A. ; Wilhelm, F. ; Liu, J. ; Shao, Y. ; Ollefs, Katharina ; Gruner, M. E. ; Wende, Heiko ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | A multi-stage, first-order phase transition in LaFe11.8Si1.2: interplay between the structural, magnetic, and electronic degrees of freedom |
| Sprache: | Englisch |
| Publikationsjahr: | 1 August 2023 |
| Verlag: | AIP Publishing LLC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Reviews |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1063/5.0133411 |
| Kurzbeschreibung (Abstract): | Alloys with a first-order magnetic transition are central to solid-state refrigeration technology, sensors and actuators, or spintronic devices. The discontinuous nature of the transition in these materials is a consequence of the coupling between the magnetic, electronic, and structural subsystems, and such transition can, in principle, cross several metastable states, where at one point, the transition takes place within the magnetic subsystem, while at another, the changes occur in the structural or electronic subsystems. To address this issue, we conducted simultaneous measurements of the macroscopic properties—magnetization, temperature change of the sample, longitudinal, and transversal magnetostrictions—to reveal the rich details of the magneto-structural, first-order transition occurring in the prototypical alloy LaFe11.8Si1.2. We found that the transition does not complete in one but in two distinct stages. The presence of the intermediate state changes the potential-energy landscape, which then impacts strongly on the width of the hysteresis associated with the first-order transition. We complement these findings with experiments on the atomistic scale, i.e., x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and Mössbauer spectroscopy, and then combine them with first-principles calculations to reveal the full complexity and two-stage nature of the transition. This new approach can be successfully extended to a large class of advanced magnetic materials that exhibit analogous transformations. |
| Zusätzliche Informationen: | Artikel-ID: 031408 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien |
| Hinterlegungsdatum: | 22 Jan 2024 07:26 |
| Letzte Änderung: | 22 Jan 2024 07:55 |
| PPN: | 514874201 |
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