Abstract
Top and bottom NiO-pinning spin valves of Si/Ta/NiO/Co/Cu/Co/Ta and Si/Ta/Co/Cu/Co/NiO/Ta were prepared by magnetron sputtering, and X-ray diffraction and giant magnetoresistance (GMR) ratio were measured in the temperature range from 5 K to 300 K. For the bottom spin valve, the interfacial roughness at NiO/Co is much smaller than that of Co/NiO in the top one. The Co/Cu and Cu/Co interfaces have the same roughness in the bottom and the top spin valves. NiO, Co, and Cu layers have (111) preferred orientations in the top one and random orientations in the bottom one. The GMR ratio of the bottom spin valve is larger than that of the top one at all temperatures and their difference increases with the decrease of temperature.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 397-400 |
| Number of pages | 4 |
| Journal | Journal of Materials Science and Technology |
| Volume | 22 |
| Issue number | 3 |
| State | Published - May 2006 |
| Externally published | Yes |
Keywords
- Interfacial roughness
- Specular reflection
- Spin valve
ASJC Scopus subject areas
- Ceramics and Composites
- Mechanics of Materials
- Mechanical Engineering
- Polymers and Plastics
- Metals and Alloys
- Materials Chemistry