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公开(公告)号：SG52926A1
公开(公告)日：1998-09-28
申请号：SG1997000639
申请日：1997-03-03
Applicant: IBM
Inventor： SONOBE YOSHIAKI , IKEDA YOSHIHIRO , UCHIDA HIROSHI , TOYOOKA TAKASHI , TAGASHIRA YOSHIUKI
Abstract: A perpendicular magnetic recording medium wherein a perpendicular magnetic film is formed on a substrate or a nonmagnetic film, and the perpendicular magnetic film contains Co and Cr, the content of the Cr being 22 at. % or higher but 30 at. % or less. The medium is used in a magnetic recording disk drive using a magnetoresistive read head.
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公开(公告)号：JP2001126229A
公开(公告)日：2001-05-11
申请号：JP2000321475
申请日：2000-10-20
Applicant: IBM JAPAN
Inventor： SONOBE YOSHIAKI , IKEDA YOSHIHIRO , UCHIDA HIROSHI , TOYOOKA TAKASHI , TAGASHIRA KAKO
Abstract: PROBLEM TO BE SOLVED: To provide a perpendicular recording medium suitable for using a head utilizing a magneto resistance effect as a reproducing head. SOLUTION: A perpendicular magnetic recording medium having a laminated structure including plural recording layers is characterized in that at least one layer of the recording layers is a perpendicularly magnetized film layer having a composition expressed by the formula (Co100-xCrx)100-yPty wherein x and y are in the range of 27
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公开(公告)号：JPH09298114A
公开(公告)日：1997-11-18
申请号：JP646397
申请日：1997-01-17
Applicant: IBM JAPAN
Inventor： SONOBE YOSHIAKI , IKEDA YOSHIHIRO , UCHIDA HIROSHI , TOYOOKA TAKASHI , TAGASHIRA KAKO
Abstract: PROBLEM TO BE SOLVED: To obtain a good vertical magnetic interaction as one of the characteristics of a vertical magnetic recording medium by a method wherein the composition of a vertical magnetizing film contains Co and Cr, the amount of the Cr is set in the extent of a specified atomic % of higher to a specified atomic % or lower and the vertical magnetizing film is magnetized in the vertical direction to the film surface of the magnetizing film. SOLUTION: A vertical magnetizing film 12 is formed on a glass substrate 10 as a recording layer via a base layer 11 consisting of a Ti layer. The composition of the film 12 contains Co and Cr, the amount of the Cr is contained more than 22 atomic % and is contained within the extent of 30 atomic % of lower and the film 12 is made to magnetize in the vertical direction to the film surface of the film 12. Thereby, a good vertical magnetic interaction can be obtained as one of the characteristics of a vertical magnetic recording medium and though the output of a magnetic recording device is reduced in the extent that the amount of the Cr is 22 atomic % or higher to 30 atomic % or lower, the device can obtain a good S/N ratio.
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公开(公告)号：JPH07230603A
公开(公告)日：1995-08-29
申请号：JP1840194
申请日：1994-02-15
Applicant: IBM
Inventor： WATANUKI MASAAKI , TSUJI SATOSHI , IKEDA YOSHIHIRO
Abstract: PURPOSE: To improve a recording speed by recording a signal in a magnetic recording medium by a magnetic field generated from a chip according to the signal current by impressing a signal current to a coil. CONSTITUTION: The chip 11 is formed closely to the magnetic recording medium 12, and the coil 13 is formed on the medium 12. The chip 11 is connected with a rough adjusting mechanism 14 and a fine adjusting mechanism 15 to be position-controlled. The rough adjusting mechanism 14 is a voice motor, e.g. and as the fine adjusting mechanism 15, a piezo-element, etc., are used. An X-direction and Y-direction, namely directions parallel with the surface of the magnetic recording medium, are adjusted by the fine adjusting mechanism 15 connected to the chip, and a Z-direction vertical to the surface of the magnetic recording medium adjusted by a Z pizeo-element formed at the lower part of the medium. A piezo-driver 17 is connected to the Z element. The coil 13 is constituted of a lithograph on the medium 12, and this coil 13 switches the magnetic direction of the tip of the chip.
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