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Magnetoelectric Tuning of Pinning‐Type Permanent Magnets through Atomic‐Scale Engineering of Grain Boundaries

Ye, Xinglong ; Yan, Fengkai ; Schäfer, Lukas ; Wang, Di ; Geßwein, Holger ; Wang, Wu ; Chellali, Mohammed Reda ; Stephenson, Leigh T. ; Skokov, Konstantin ; Gutfleisch, Oliver ; Raabe, Dierk ; Hahn, Horst ; Gault, Baptiste ; Kruk, Robert (2024)
Magnetoelectric Tuning of Pinning‐Type Permanent Magnets through Atomic‐Scale Engineering of Grain Boundaries.
In: Advanced Materials, 2021, 33 (5)
doi: 10.26083/tuprints-00017824
Article, Secondary publication, Publisher's Version

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Abstract

Pinning‐type magnets with high coercivity at high temperatures are at the core of thriving clean‐energy technologies. Among these, Sm₂Co₁₇‐based magnets are excellent candidates owing to their high‐temperature stability. However, despite intensive efforts to optimize the intragranular microstructure, the coercivity currently only reaches 20–30% of the theoretical limits. Here, the roles of the grain‐interior nanostructure and the grain boundaries in controlling coercivity are disentangled by an emerging magnetoelectric approach. Through hydrogen charging/discharging by applying voltages of only ≈1 V, the coercivity is reversibly tuned by an unprecedented value of ≈1.3 T. In situ magneto‐structural characterization and atomic‐scale tracking of hydrogen atoms reveal that the segregation of hydrogen atoms at the grain boundaries, rather than the change of the crystal structure, dominates the reversible and substantial change of coercivity. Hydrogen reduces the local magnetocrystalline anisotropy and facilitates the magnetization reversal starting from the grain boundaries. This study opens a way to achieve the giant magnetoelectric effect in permanent magnets by engineering grain boundaries with hydrogen atoms. Furthermore, it reveals the so far neglected critical role of grain boundaries in the conventional magnetization‐switching paradigm of pinning‐type magnets, suggesting a critical reconsideration of engineering strategies to overcome the coercivity limits.

Item Type: Article
Erschienen: 2024
Creators: Ye, Xinglong ; Yan, Fengkai ; Schäfer, Lukas ; Wang, Di ; Geßwein, Holger ; Wang, Wu ; Chellali, Mohammed Reda ; Stephenson, Leigh T. ; Skokov, Konstantin ; Gutfleisch, Oliver ; Raabe, Dierk ; Hahn, Horst ; Gault, Baptiste ; Kruk, Robert
Type of entry: Secondary publication
Title: Magnetoelectric Tuning of Pinning‐Type Permanent Magnets through Atomic‐Scale Engineering of Grain Boundaries
Language: English
Date: 5 January 2024
Place of Publication: Darmstadt
Year of primary publication: 2021
Place of primary publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Materials
Volume of the journal: 33
Issue Number: 5
Collation: 7 Seiten
DOI: 10.26083/tuprints-00017824
URL / URN: https://tuprints.ulb.tu-darmstadt.de/17824
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

Pinning‐type magnets with high coercivity at high temperatures are at the core of thriving clean‐energy technologies. Among these, Sm₂Co₁₇‐based magnets are excellent candidates owing to their high‐temperature stability. However, despite intensive efforts to optimize the intragranular microstructure, the coercivity currently only reaches 20–30% of the theoretical limits. Here, the roles of the grain‐interior nanostructure and the grain boundaries in controlling coercivity are disentangled by an emerging magnetoelectric approach. Through hydrogen charging/discharging by applying voltages of only ≈1 V, the coercivity is reversibly tuned by an unprecedented value of ≈1.3 T. In situ magneto‐structural characterization and atomic‐scale tracking of hydrogen atoms reveal that the segregation of hydrogen atoms at the grain boundaries, rather than the change of the crystal structure, dominates the reversible and substantial change of coercivity. Hydrogen reduces the local magnetocrystalline anisotropy and facilitates the magnetization reversal starting from the grain boundaries. This study opens a way to achieve the giant magnetoelectric effect in permanent magnets by engineering grain boundaries with hydrogen atoms. Furthermore, it reveals the so far neglected critical role of grain boundaries in the conventional magnetization‐switching paradigm of pinning‐type magnets, suggesting a critical reconsideration of engineering strategies to overcome the coercivity limits.

Uncontrolled Keywords: grain boundaries, hydrogen, magnetoelectric coupling, permanent magnets
Identification Number: 2006853
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-178246
Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 660 Chemical 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 > Functional Materials
Date Deposited: 05 Jan 2024 13:40
Last Modified: 08 Jan 2024 07:38
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