成果報告書詳細
管理番号20160000000318
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム 正方晶B2・FeCo基合金による革新的永久磁石の開発
公開日2016/5/17
報告書年度2015 - 2015
委託先名国立大学法人秋田大学 国立大学法人東北大学大学院工学研究科 公立大学法人滋賀県立大学
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Advanced Research Program for Energy and Environmental Technologies/ Development of the innovative permanent magnet with the tetragonal-B2, FeCo based alloy

The present project is composed of 5 research assignments (A-1,A-2,B,C,D).

A-1; Theoretical calculation of magnetic anisotropy for tetragonal B2・FeCo-XY (X=Al,Ga,Ti,V,Nb, Ta ; Y=N,B,C) intermetallic compounds based on the first principles approach
To search for the tetragonal B2・FeCo-XY (X=Al,Ga,Ti,V,Nb,Ta ; Y=N,B,C) intermetallic compounds having large magnetic anisotropy constant Ku, based on the first principles approach, we have investigated Ku of α”-Fe16X2 (X=B, C, N, Vacancy) ordered alloys(c/a?1.1). The results indicate that the Ku are high in the order of N>C>B>Vacancy and the highest value is Ku?0.4MJ/m3 in X=N. Note, here, that the Ku for X=Vacancy is slightly negative, which is consistent with the predicted result that the Ku of bct-Fe with c/a>1 exhibit negative values. We also calculated the Ku values for α”-Fe16-XCoXN2 and obtained Ku?3MJ/m3 for X?4. This value is around 1/3 of theoretically predicted value in tetragonal FeCo alloy with c/a?1.1, from which we can expect to realize high Ku system in Co-substituted α”-Fe16N2. We also found that such performance requires ordered arrangement of N atoms as well as in the α”-Fe16N2 ordered alloy. In the lack of ordered arrangement, the Ku is extremely decreased.
A-2: Theoretical calculation of structural stability for tetragonal B2・FeCo-XY (X=Al,Ga,Ti,V,Nb,Ta ; Y=N,B,C) intermetallic compounds based on the first principles approach
 Calculation procedure of structural stability for tetragonal B2・FeCo-XY intermetallic compounds in this program was determined.
B: Exploration of tetragonal B2・FeCo-Al and FeCoXY thick films by thin film process
 FeCo-Ti films with a thickness of 2-20 nm were prepared and its magnetic properties were studied. The perpendicular magnetic anisotropy of FeCo-Ti films are almost the same as FeCo and FeCo-Al system. Patterning of FeCo and FeCoAl films with 2~20nm into small dots with electron-beam lithography is planned.
C: Development of tetragonal B2・FeCo-X bulk materials
 In order to provide high performance magnetic materials with tetragonal crystal structures, FeCo-XY(X,Y are 3rd and 4th elements) alloys are first prepared by repeating of stacking-and-rolling of metal foils, and made into bulk plates with a texture of cube-orientation. Next, the bulk plates will be subjected to a nitriding process, and then tetragonal distortion will be introduced.
 At present, controlling of textures for FeCo-Al alloys are undertaken, and alloy plate with the thickness of 200μm with Goss-orientation texture has been obtained. Plates with the cube-orientation have been also obtained. A quenching treatment which causes martensitic transformation has been carried out on some FeCo-XY(X=carbon, Y= transition metal elements) quaternary alloys. A tetragonal alloy with the ratio c/a=1.02 has been obtained in the present stage.
D: Research committee
Research committee was held in February 2016, and the research plan of the project was determined.
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