1. 1）J. F. Gantz, C. Chute, A. Manfrediz, S. Minton, D. Reinsel, W. Schlichting and A. Toncheva: An IDC white paper - The diverse and exploding digital universe. March 2008.
2. 2）（a）S. D. Bader and S. S. P. Parkin: Annu. Rev. Condens. Matter Phys. 1, 71 (2010),
3. （b）J. Sinova and I. Žutić: Nature Mater. 11, 368 (2012).
4. 3）S. Datta and B. Das: Appl. Phys. Lett. 56, 665 (1990).
5. 4）A. Hubert and R. Schäfer: Magnetic Domains: the Analysis of Magnetic Microstructures. (Springer-Verlag, Berlin, Heidelberg, 1998).