1. Department of Physics and Quantum-Function Research Laboratory
2. Hanyang University
3. Seoul 133-791
4. Korea
5. School of Electrical Engineering
6. Korea University
7. Seoul 136-701
8. Republic of Korea
9. Quantum Functional Semiconductor Research Center
10. Dongguk University
11. Seoul 100-715
12. Center for Spintronics Research
13. Korea Institute of Science and Technology
14. Seoul 136-791
15. Department of Materials Science Engineering