Title :
Recording characteristics of electroless-plated perpendicular recording flexible disks with a perpendicular head
Author :
Matsubara, Hiroshi ; Mizutani, Hirokazu ; Mitamura, Satoshi ; Osaka, Tetsuya
Author_Institution :
Dept. of Appl. Chem., Waseda Univ., Tokyo, Japan
fDate :
5/1/1990 12:00:00 AM
Abstract :
Perpendicular magnetic recording using a main-pole-driven perpendicular head was tested using electroless-plated flexible disks. Soft magnetic NiFeP films, also produced by electroless plating, were used as an underlayer of a perpendicular recording medium in this test. Two types of flexible double-layer media, composed of an electrodeless-plated CoNiReP film with two types of NiFeP underlayers with a coercivity of 2 and 5.5 Oe, were fabricated, and their recording characteristics were measured. A recording density value of 75 kFRPI was obtained for the medium with the softer magnetic 2-Oe underlayer, about twice as high a value as that for the medium with the 5.5-Oe underlayer
Keywords :
cobalt alloys; coercive force; electroless deposited coatings; ferromagnetic properties of substances; floppy discs; iron alloys; magnetic recording; magnetic thin films; nickel alloys; phosphorus alloys; CoNiReP film; NiFeP films; double-layer media; electroless-plated; magnetic recording; main-pole-driven; perpendicular head; perpendicular recording flexible disks; recording characteristics; recording density value; underlayers; Coercive force; Disk recording; Magnetic films; Magnetic heads; Magnetic properties; Magnetic recording; Perpendicular magnetic recording; Soft magnetic materials; Testing; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
