2012 Fiscal Year Final Research Report
Exploration of new magnetic materials by controlling nanostructures
| Project/Area Number |
23656404
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
MORI Shigeo 大阪府立大学, 大学院・工学研究科, 教授 (20251613)
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| Project Period (FY) |
2011 – 2012
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| Keywords | ナノ構造制御 / 磁性材料 / ローレンツTEM / 電子回折 |
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| Research Abstract |
Spinel-type magnetic materials with ordered array of two types of rectangular nanorods, characterized as chessboard-type (CB-type) nanodomain structures, have been explored by changing the isothermal annealing time at 648 K. We successfully synthesized magnetic materialswith highly organized CB-type nanodomains developed through the isothermal annealing treatment from 10 to 730 hours. By optimizing synthesized conditions, it was revealed that the CB-type nanodomain structures with ~50 nm2in size are formed, consisting of two distinct nanorods with ferromagnetic CoFe_<1.4>MnO_4with the cubic structure and paramagnetic CoFe_<0.4>Mn_2O_4with the orthorhombic structure. We demonstrated that the formation of characteristic CB-type nanodomains resulted in the development of magnetic properties. In addition, magnetic materials without rare-metal elements were successfully synthesized by partial substitution of Cu for Co in Co(Fe,Mn)_2O_4
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