Title :
Improvement of magnetic properties and crystallinity of Co-Cr/Ni-Fe double-layer with very thin Co79Cr21 underlayer
Author :
Nakagawa, S. ; Akiyama, S. ; Sumide, M. ; Naoe, M.
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
A three-step sputtering system for improving the crystallinity of the Ni-Fe backlayer and the c-axis orientation of the Co-Cr recording layer in double-layered perpendicular magnetic recording media is presented. It is found that the Co79Cr21 ultrathin underlayer with a thickness of only 100 Å was useful for improving the crystallinity of Ni-Fe backlayers without change of their soft magnetism. The Ni81Fe19 layer grew on the underlayer heteroepitaxially and, in addition, exhibited good orientation of the (111) plane. Such a special underlayer could directly improve the crystallinity of the Ni81Fe19 backlayer and indirectly improve the c-axis orientation for a Co83Cr17 recording layer through the backlayers, leading to sufficient perpendicular magnetic anisotropy in the triple-layered films
Keywords :
chromium alloys; cobalt alloys; crystal orientation; iron alloys; magnetic anisotropy; magnetic recording; magnetic thin films; nickel alloys; sputtered coatings; Co79Cr21 ultrathin underlayer; Co83Cr17 recording layer; Ni81Fe19 backlayer; NiFe-CoCr; c-axis orientation; crystallinity; double-layered perpendicular magnetic recording media; magnetic properties; perpendicular magnetic anisotropy; soft magnetism; three-step sputtering system; triple-layered films; Chromium; Crystallization; Iron; Magnetic anisotropy; Magnetic films; Magnetic properties; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Soft magnetic materials; Sputtering;
Journal_Title :
Magnetics, IEEE Transactions on
