| Project/Area Number |
06650376
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Electronic materials/Electric materials
|
|---|
| Research Institution | Kyushu Kyoritsu University |
|---|
Principal Investigator |
GONDO Yasuo Kyushu Kyoritsu University, Faculty of Engineering, Professor, 工学部, 教授 (50017852)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
NOZAWA Tadao Kyushu Kyoritsu University, Faculty of Engineering, Professor, 工学部, 教授 (10268790)
SHOJI Fumiya Kyushu Kyoritsu University, Faculty of Engineering, Professor, 工学部, 教授 (00093419)
|
|---|
| Project Period (FY) |
1994 – 1995
|
| Project Status |
Completed (Fiscal Year 1995)
|
| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,700,000 (Direct Cost: ¥1,700,000)
|
|---|
| Keywords | Ferromagnetic tunneling / Ferromagnetic multilayr / Giant magnetoresistance effect (GMR) / Spin-polarized electron / Inter-magnetic-layr interaction / Magnetic domain structure / Exchange-coupled bilayrs / Spin valve Effect (SV) |
|---|
| Research Abstract |
It is interesting to note the similarity between the phenomenon of the giant magnetoresistance (GMR) and that of spin-dependent electron tunneling between the both electrodes of ferromagnetic tunneling junctions. (Spin valve effect.) The present research, therefore, has attracted considerable attention both from practical and fundamental point of views.
The present study was focused on the magnetization process, the magnetoresistance and the magnetic domain structure in the simplest bilayr structure composed of soft Ni_<80>Fe_<20> (t_s) /hard Fe (t_h), in which direct positive exchange-coupling takes plce. Here their thickness t_s and t_h are below the critical thickness t_c. The coercive force and the magnetoresistance in the exchange-coupled bilayr film depend on the thickness ratio ts/ (t_s+t_h). For thicknesses below t_c, it is expected the both films act as a single film with a coercive force between those of the individual films. Under such circumstances, the spins in the soft film exhibit a continuous rotation as in the Bloch walls generated parallel to the film plane. It was found the magnetoresistance in the exchange-coupled bilayrs is explained in terms of the continuous rotation of the spins in the layrs, as a superposition of the spin valve effect and the ordinary anisotropic magnetoresistance.
|
