Evolution of new magnetic materials with ultrahigh coercivity
| Project/Area Number |
19K15391
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 28030:Nanomaterials-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | SmFe12 / Ultrahigh / Coercivity / Permanent / Magnet / Materials / High Performance / Magnet Materials / Rare Earth / Transition Metal / Magnetic Pinning / Hydride / Permanent Magnets / Ferromagnetic Materials / Ultrahigh Coercivity / Large Energy Product |
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| Outline of Research at the Start |
1. Discovering new Sm(Fe1-xCox)12-yTiy (ThMn12, I4/mmm) hard ferromagnetic materials
2. Evolution of the easy-axis aligned Sm(Fe1-xCox)12-yTiy bulk nanostructured PMs with large energy products
3. Development of a bottom-up approach for the preparation of the Sm(Fe1-xCox)12-yTiy nanoparticles
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| Outline of Final Research Achievements |
We have succeeded in preparing (Sm,Zr)(Fe,Co,Ti)12 (ThMn12, I4/mmm) well-defined particles with ever-larger coercivity (Hc) and remanent magnetization (Mr) based on precise control over their crystallinity and microstructure using chemical synthesis. In particular, the synthesized (Sm,Zr)(Fe,Co,Ti)12 particles have high crystallinity, controllable grain-size and composition, and diverse surface from Sm-enriched and Ti-enriched to depleted surface.
The most important achievements for their Hc and Mr were as large as 1.6T and 1.2T, respectively, at 300 K for isotropic powders. This result is the world's highest performance for SmFe12-based permanent magnet materials. It is a breakthrough in the development of SmFe12-based permanent magnet materials, opening a new era of permanent magnets.
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| Academic Significance and Societal Importance of the Research Achievements |
Through these studies, novel nanomaterials science called “nanoscale transformation science” and high performance permanent magnet materials are developed. The research achievement addresses the most pressing challenges of the rare-earth crisis for applications in energy-saving technologies.
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Report
(4 results)
Research Products
(12 results)
