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Creating a Ferromagnetic Ground State with Tc Above Room Temperature in a Paramagnetic Alloy through Non‐Equilibrium Nanostructuring

Ye, Xinglong ; Fortunato, Nuno ; Sarkar, Abhishek ; Geßwein, Holger ; Wang, Di ; Chen, Xiang ; Eggert, Benedikt ; Wende, Heiko ; Brand, Richard A. ; Zhang, Hongbin ; Hahn, Horst ; Kruk, Robert (2022)
Creating a Ferromagnetic Ground State with Tc Above Room Temperature in a Paramagnetic Alloy through Non‐Equilibrium Nanostructuring.
In: Advanced Materials, 2022, 34 (11)
doi: 10.26083/tuprints-00021539
Article, Secondary publication, Publisher's Version

Abstract

Materials with strong magnetostructural coupling have complex energy landscapes featuring multiple local ground states, thus making it possible to switch among distinct magnetic‐electronic properties. However, these energy minima are rarely accessible by a mere application of an external stimuli to the system in equilibrium state. A ferromagnetic ground state, with Tc above room temperature, can be created in an initially paramagnetic alloy by nonequilibrium nanostructuring. By a dealloying process, bulk chemically disordered FeRh alloys are transformed into a nanoporous structure with the topology of a few nanometer‐sized ligaments and nodes. Magnetometry and Mössbauer spectroscopy reveal the coexistence of two magnetic ground states, a conventional low‐temperature spin‐glass and a hitherto‐unknown robust ferromagnetic phase. The emergence of the ferromagnetic phase is validated by density functional theory calculations showing that local tetragonal distortion induced by surface stress favors ferromagnetic ordering. The study provides a means for reaching conventionally inaccessible magnetic states, resulting in a complete on/off ferromagnetic–paramagnetic switching over a broad temperature range.

Item Type: Article
Erschienen: 2022
Creators: Ye, Xinglong ; Fortunato, Nuno ; Sarkar, Abhishek ; Geßwein, Holger ; Wang, Di ; Chen, Xiang ; Eggert, Benedikt ; Wende, Heiko ; Brand, Richard A. ; Zhang, Hongbin ; Hahn, Horst ; Kruk, Robert
Type of entry: Secondary publication
Title: Creating a Ferromagnetic Ground State with Tc Above Room Temperature in a Paramagnetic Alloy through Non‐Equilibrium Nanostructuring
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Materials
Volume of the journal: 34
Issue Number: 11
Collation: 11 Seiten
DOI: 10.26083/tuprints-00021539
URL / URN: https://tuprints.ulb.tu-darmstadt.de/21539
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Origin: Secondary publication DeepGreen
Abstract:

Materials with strong magnetostructural coupling have complex energy landscapes featuring multiple local ground states, thus making it possible to switch among distinct magnetic‐electronic properties. However, these energy minima are rarely accessible by a mere application of an external stimuli to the system in equilibrium state. A ferromagnetic ground state, with Tc above room temperature, can be created in an initially paramagnetic alloy by nonequilibrium nanostructuring. By a dealloying process, bulk chemically disordered FeRh alloys are transformed into a nanoporous structure with the topology of a few nanometer‐sized ligaments and nodes. Magnetometry and Mössbauer spectroscopy reveal the coexistence of two magnetic ground states, a conventional low‐temperature spin‐glass and a hitherto‐unknown robust ferromagnetic phase. The emergence of the ferromagnetic phase is validated by density functional theory calculations showing that local tetragonal distortion induced by surface stress favors ferromagnetic ordering. The study provides a means for reaching conventionally inaccessible magnetic states, resulting in a complete on/off ferromagnetic–paramagnetic switching over a broad temperature range.

Uncontrolled Keywords: FeRh alloys, ferromagnetic materials, magnetostructural coupling, multiple ground states, non‐equilibrium nanostructuring, paramagnetic materials
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-215396
Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
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 > Joint Research Laboratory Nanomaterials
Date Deposited: 01 Jul 2022 11:40
Last Modified: 04 Jul 2022 05:17
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