JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 36, no. 1, page. 54 - 59, 2000-01
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, vol. 12, no. 5, page. 2672 - 2679, 1994-09
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 126, no. 1-3, page. 316 - 319, 1993-09