1. [1] S.M. Mansfield, W.R. Studenmund, G.S. Kino, and K. Osato: Optics Letters, Vol. 18, 305-307 (1993).
2. [2] A. Fukumoto, S. Yoshimura, T. Udagawa, K. Aratani, M. Ohta and M. Kaneko: Proc. Data Storage Topical Mtg., TuB4 (Colorado Springs, 1991).
3. [3] H. Awano, A. Yamaguchi, S. Sumi, S. Ohnuki, H. Shirai, N. Ohta, K. Torazawa : Appl. Phys. Lett., Vol.69, 4257 (1996) .
4. [4] A. Itoh et al.: Digests of the tenth annual conference on magnetics in Japan,4pB-1 (Kanazawa, 1986) [in Japanese].
5. [5] K. Rubin et al.: Proc. Optical Data Storage Topical Meeting, WA3-1 (Dana Point, CA, 1994).