Title :
High-coercivity longitudinal recording medium prepared using non-heating process
Author :
Ohmori, Hiroyuki ; Itoh, Akira ; Maesaka, Akihiro ; Okabe, Akihiko
Author_Institution :
Core Technol. Dev. Center, Sony Corp. Core Technol. & Network Co., Yokohama, Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
To get high coercivity in a longitudinal recording medium prepared at a low temperature, we found that a Ru underlayer is effective to enhance the coercivity for Co-Pt-based thin films. Increasing the Ru underlayer thickness and Pt composition of the magnetic layer increases coercivity. The introduction of boron and oxygen into the magnetic layer induces the segregation of grains
Keywords :
cobalt alloys; coercive force; ferromagnetic materials; interface magnetism; magnetic recording; magnetic thin films; permanent magnets; platinum alloys; ruthenium; segregation; Co-Pt-based thin films; CoPt-Ru; CoPt:O,B; Pt composition; Ru underlayer; Ru underlayer thickness; boron; enhanced coercivity; grain segregation; high coercivity; high-coercivity longitudinal recording medium; longitudinal recording medium; low temperature; magnetic layer; nonheating process; oxygen; Chromium; Coercive force; Crystalline materials; Disk recording; Magnetic films; Magnetic materials; Magnetic recording; Sputtering; Substrates; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
