2019 Fiscal Year Research-status Report
Evolution of new magnetic materials with ultrahigh coercivity
| Project/Area Number |
19K15391
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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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| Keywords | SmFe12 / Rare Earth / Transition Metal / Hydride / Permanent Magnets |
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| Outline of Annual Research Achievements |
A bottom-up approach for the preparation of the Sm(Fe1-xCox)12-yTiy (ThMn12, I4mmm) particles composed of the controllable chemical synthesis and reduction-diffusion process has been developed, opening horizons for optimization of the microstructure and enhancement of the magnetic performance of the materials.
Structure and magnetic properties of the materials have been elucidated using a wide range of techniques: partial substitution of Fe with Co and Ti has stabilized the highly tetragonal lattice in bulk and resulted in large saturation magnetization, large anisotropy files, and high Curie temperature; hydrogen interstitial doping has strongly stabilized the easy c-axis anisotropy and significantly enhanced the anisotropy field and Curie temperature of the materials.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The research progress well regards the research objective and implemented plan in 2019, as follows:
(1) A efficient methodology for the preparation of Sm(Fe1-xCox)12-yTiy (ThMn12, I4/mmm) particles has been established and
(2) Structure and magnetic properties of the materials have been characterized and analyzed in details.
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| Strategy for Future Research Activity |
The research is planned as follows:
(1) Controlling the microstructure of the materials: particle size in a range of D = 100-1000 nm and further optimization of their stoichiometry,
(2) Fabrication of the easy-axis aligned Sm(Fe1-xCox)12-yTiy bulk nanostructured permanent magnets by green compacting, bonding, or sintering processes under apply fields for green magnets or sintered magnets, respectively, and
(3) Elucidating and understanding the microstructure and magnetic properties of the Sm(Fe1-xCox)12-yTiy nanopowders and the bulk nanostructured permanent magnets.
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| Causes of Carryover |
Some academic conferences and research workshops have been cancelled due to the novel coronavirus (COVID-19) outbreak.
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Research Products
(4 results)
