PURPOSE: To improve the adhesive power of a magnetic layer upon a base material which is subjected to an ion bombardment treatment by implanting ions to the underlying layer on the base material.
CONSTITUTION: After a base material of polyethylene terephalate film or the like is subjected to an ion bombardment treatment by applying an AC or DC electric field thereto in gaseous oxygen, magnetic metals such as metals like Co and Ni or their alloys or the alloys contained with Cu, Bi, Sb, etc. are vapor deposited on the surface of the ion bombarded base material to 100W500 thickness; thereafter such underlying layer is implanted with ions N2, Ar, O2, Kr, Xe, etc. by an ion implantation treatment and vapor deposition layers of the magnetic metals are formed thereon, whereby the vapor deposited magnetic recording medium of thin film type is obtained.
BABA KENICHI
KAWANA TAKAHIRO
