Title :
Perpendicular magnetic recording process of electroless-plated CoNiReP/NiFeP double-layered media with ring-type heads
Author :
Osaka, Tetsuya ; Homma, Takayuki ; Noda, Kazuhiro ; Watanabe, Toshihiko ; Goto, Fumio
Author_Institution :
Dept. of Appl. Chem., Waseda Univ., Tokyo, Japan
fDate :
11/1/1991 12:00:00 AM
Abstract :
Electroless-plated CoNiReP/NiFeP double-layered (DL) media with various underlayer coercivities (Hc(u)) were examined to study perpendicular recording performance using ring-type heads. For the case of a DL medium with a combination of ring-type heads, it is found that the enhancement of the reproduced voltage by the phase synchronization (PS) effect is significantly influenced by varying the perpendicular layer thickness (δp) and head parameters. In the recording performance using a Mn-Zn ferrite head, the reproduced voltage is drastically enhanced by the PS effect as far as the head field penetrates sufficiently into the bottom of the DL media and magnetizes the underlayer. In the case of using a metal-in-gap head with Bs=15 kG, the penetration of the head field was further improved
Keywords :
cobalt alloys; coercive force; electroless deposited coatings; iron alloys; magnetic disc storage; magnetic heads; magnetic recording; magnetic thin film devices; nickel alloys; phosphorus alloys; rhenium alloys; CoNiReP-NiFeP; Mn1-xZnxFe2O4 head; MnZn ferrite head; electroless plated double layered media; head field penetration; head parameters; metal-in-gap head; perpendicular layer thickness; perpendicular magnetic recording process; phase synchronisation effect; ring-type heads; underlayer coercivities; Coercive force; Disk recording; Ferrites; Magnetic heads; National electric code; Perpendicular magnetic recording; Polyimides; Saturation magnetization; Soft magnetic materials; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
