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
 | There is a more recent version of this item available. |
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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| Suche nach Titel in: | TUfind oder in Google |
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