| Project/Area Number |
16310081
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Nanomaterials/Nanobioscience
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
SHIRAI Masafumi Tohoku Univiersity, Research Institute of Electrical Communication, Professor, 電気通信研究所, 教授 (70221306)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SAKUMA Akimasa Tohoku University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (30361124)
YAMAGAMI Hiroshi Kyoto Sangyo University, Faculty of Science, Professor, 理学部, 教授 (20239867)
NAKAMURA Kohji Mie University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 助教授 (70281847)
ODA Tatsuki Kanazawa University, Graduate School of Natural Science and Technology, Associate Professor, 大学院自然科学研究科, 助教授 (30272941)
ONO Kanta High Energy Accelerator Research Organization, Institute of Materials Structure Science, Associate Professor, 物質構造科学研究所, 助教授 (70282572)
長尾 和多加 東北大学, 電気通信研究所, 助手 (00361197)
三浦 良雄 東北大学, 電気通信研究所, 助手 (10361198)
|
|---|
| Project Period (FY) |
2004 – 2006
|
| Project Status |
Completed (Fiscal Year 2006)
|
| Budget Amount *help |
¥15,500,000 (Direct Cost: ¥15,500,000)
Fiscal Year 2006: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 2004: ¥6,000,000 (Direct Cost: ¥6,000,000)
|
|---|
| Keywords | Nano-materials / Spin-electronics / Spin dynamics / Spin current / Magnetic domain wall / First-principles calculation / Micro-magnetic simulation / Photoelectron emission microscopy / マイクロ磁気シミュレーション / ナノ磁性 / ノンコリニア磁性 / スピン依存電気伝導 / スピン・ダイナミクス / 磁性流体 / シミュレーション |
|---|
| Research Abstract |
In order to contribute to the realization of new functional devices exploiting quantum nature of electrons, the theoretical basis for analyzing physical properties of nanometer-scale magnetic materials and devices has been constructed as follows :
1.The relation between atomic structures and spin-dependent transport phenomena has been clarified for epitaxial tunneling junctions and for metallic nanowires containing magnetic impurities. (M.Shirai, Y.Miura, K.Nagao)
2.The first-principles computational code for analyzing non-collinear spin structure has been improved so as to account the disorder in atomic and spin configurations within the coherent potential approximation. The electronic and magnetic structures in Mn-based disordered alloys have been investigated by using the computational code. (A.Sakuma)
3.The computational procedure which can account spiral magnetic structures correctly has been formulated on the basis of full-relativistic Dirac equations. (H.Yamagami)
4.The magnetic structure at ferromagnet/antiferromagnet interfaces has been analyzed theoretically in order to understand exchange-bias phenomena. The magnetic domain wall with a width of about 0.8 nm is found to be favorable energetically for Fe (110) monolayer. (K.Nakamura)
5.The first-principles molecular dynamics code which can account non-collinear magnetism has been developed. The formation of antiferromagnetically coupled oxygen molecule dimer (O_4 unit) has been found by the spin-dynamics simulation for liquid oxygen. (T.Oda)
6.The magnetic vortex states in nanometer-scale magnets have been observed by using the photoelectron emission microscopy. The relation between the shape of the magnet and the vortex states has been analyzed by using micro-magnetic simulation. The experimental procedure has been developed for observing the dynamics of magnetic vortex by means of photoelectron emission microscopy. (K.Ono)
|
