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A multi-stage, first-order phase transition in LaFe11.8Si1.2: interplay between the structural, magnetic, and electronic degrees of freedom

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
Article, Bibliographie

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.

Item Type: Article
Erschienen: 2023
Creators: 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
Type of entry: Bibliographie
Title: A multi-stage, first-order phase transition in LaFe11.8Si1.2: interplay between the structural, magnetic, and electronic degrees of freedom
Language: English
Date: 1 August 2023
Publisher: AIP Publishing LLC
Journal or Publication Title: Applied Physics Reviews
Volume of the journal: 10
Issue Number: 3
DOI: 10.1063/5.0133411
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.

Additional Information:

Artikel-ID: 031408

Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 22 Jan 2024 07:26
Last Modified: 22 Jan 2024 07:55
PPN: 514874201
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