Magnetoelectric Tuning of Pinning-Type Permanent Magnets through Atomic-Scale Engineering of Grain Boundaries
Ye, Xinglong1; Yan, Fengkai2,8; Schaefer, Lukas3; Wang, Di1,4; Gesswein, Holger5; Wang, Wu1,4,7; Chellali, Mohammed Reda1; Stephenson, Leigh T.2; Skokov, Konstantin3; Gutfleisch, Oliver3; Raabe, Dierk2; Hahn, Horst1; Gault, Baptiste2,6; Kruk, Robert1
Corresponding AuthorYe, Xinglong( ; Gault, Baptiste(
AbstractPinning-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 approximate to 1 V, the coercivity is reversibly tuned by an unprecedented value of approximate to 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.
Keywordgrain boundaries hydrogen magnetoelectric coupling permanent magnets
Funding OrganizationDeutsche Forschungsgemeinschaft ; Alexander von Humboldt Foundation
Indexed BySCI
Funding ProjectDeutsche Forschungsgemeinschaft[HA 1344/34-1] ; Deutsche Forschungsgemeinschaft[CRC/TRR 270] ; Deutsche Forschungsgemeinschaft[ERC-CoG-SHINE-771602] ; Alexander von Humboldt Foundation
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000600930900001
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYe, Xinglong; Gault, Baptiste
Affiliation1.Karlsruhe Inst Technol KIT, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany
2.Max Planck Inst Eisenforsch GmbH MPIE, Dept Microstruct Phys & Alloy Design, D-40237 Dusseldorf, Germany
3.Tech Univ Darmstadt, Dept Mat Sci, D-64287 Darmstadt, Germany
4.Karlsruhe Inst Technol KIT, Karlsruhe Nano Micro Facil, D-76131 Karlsruhe, Germany
5.Karlsruhe Inst Technol, Inst Appl Mat, D-76344 Eggenstein Leopoldshafen, Germany
6.Imperial Coll London, Dept Mat, London SW7 2AZ, England
7.Southern Univ Sci & Technol, Dept Phys, Shenzhen, Peoples R China
8.Chinese Acad Sci, Inst Met Res, Shenyang, Peoples R China
Recommended Citation
GB/T 7714
Ye, Xinglong,Yan, Fengkai,Schaefer, Lukas,et al. Magnetoelectric Tuning of Pinning-Type Permanent Magnets through Atomic-Scale Engineering of Grain Boundaries[J]. ADVANCED MATERIALS,2020:7.
APA Ye, Xinglong.,Yan, Fengkai.,Schaefer, Lukas.,Wang, Di.,Gesswein, Holger.,...&Kruk, Robert.(2020).Magnetoelectric Tuning of Pinning-Type Permanent Magnets through Atomic-Scale Engineering of Grain Boundaries.ADVANCED MATERIALS,7.
MLA Ye, Xinglong,et al."Magnetoelectric Tuning of Pinning-Type Permanent Magnets through Atomic-Scale Engineering of Grain Boundaries".ADVANCED MATERIALS (2020):7.
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