2012 Fiscal Year Final Research Report
Development of "ExchangeCoupled Magnet" based on a new principle- Towards rare-earth free magnet -
| Project/Area Number |
23656224
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Electronic materials/Electric materials
|
|---|
| Research Institution | Nagasaki University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
NAKANO Masaki 長崎大学, 大学院・工学研究, 准教授 (20274623)
YANAI Takeshi 長崎大学, 大学院・工学研究科, 助教 (30404239)
|
|---|
| Project Period (FY) |
2011 – 2012
|
| Keywords | 磁性材料 / 保磁力 / 交換結合 / 反強磁性 / 希土類フリー |
|---|
| Research Abstract |
This investigation proposes the “exchange-coupled magnet”, in which magnetization reversal from the surfaces of a hard grain is prevented by thin ferromagnetic surface layers coupled anti-ferromagnetically with the hard grain. Thecomputer simulation for Nd-Fe-B magnets predicted that the coercivity of the exchangecoupled magnet was 1.5-2 times larger than those without anti-ferromagnetic coupling. In order to achieve such magnets, Cr, Mn, Cy, and V-based alloys were diffused from the surface of rapidly quenched Nd-Fe-B magnet powders into the boundaries between Nd2Fe14Bgrains. However, we have not succeeded to synthesizing such surface layers coupledanti-ferromagneticall with Nd_Fe_B yet
|
