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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. (Publisher's Version)
In: Advanced Materials, 34 (11), Wiley-VCH, e-ISSN 1521-4095,
DOI: 10.26083/tuprints-00021539,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Creating a Ferromagnetic Ground State with Tc Above Room Temperature in a Paramagnetic Alloy through Non‐Equilibrium Nanostructuring
Language: English
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.

Journal or Publication Title: Advanced Materials
Volume of the journal: 34
Issue Number: 11
Place of Publication: Darmstadt
Publisher: Wiley-VCH
Collation: 11 Seiten
Uncontrolled Keywords: FeRh alloys, ferromagnetic materials, magnetostructural coupling, multiple ground states, non‐equilibrium nanostructuring, paramagnetic materials
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 01 Jul 2022 11:40
Last Modified: 19 Sep 2022 11:35
DOI: 10.26083/tuprints-00021539
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-215396
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21539
PPN: 499104447
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