Vertical magnetic recording medium.

摘要

A vertical magnetic recording medium comprises a non-magnetic substrate (1, 12. 18). a permalloy film (4. 5, 13. 19) consisting of plural permalloy layers (6. 6', 14: 20a. 20b'. 24a, 24b. 24ci separated by at least one non-magnetic layer (7, 7', 15. 21. 23' 25.25') placed therein, each of said plurality of permalloy layers being 2000 A or less thick, and a Co-Cr vertical magnetization film (2. 22) formed on the permalloy film directly or through another non-magnetic layer (11.16).