1. 1) H. Takano, Y. Nishida, A. Kuroda, H. Sawaguchi, Y. Hosoe, T. Kawabe, H. Aoi, H. Muraoka, Y. Nakamura and K Ouchi: J. Magn. Magn. Matter., 235, 241 (2001).
2. 2) Y. Nakamura: IEICE Trans. Electron., E78-C, 1477, (1995).
3. Low inductance and high efficiency single-pole writing head for perpendicular double layer recording media
4. 4) Y Nakamura, H. Muraoka, Y. Shimizu and T. Inaguma: J. Magn. Soc. Jpn., 18 (Suppl. No. S1), 583 (1994).
5. 5) S. E. Lambert, B. M, Lairson, H. Nguy, L. Nguyen, T. Huang, J. Adler and S. Gopalaswamy: J. Magn. Magn. Matter., 235, 245 (2001).