1
Sadayuki Watanabe, Yasushi Sakai, Hiroyuki Uwazumi: Perpendicular magnetic recording medium and a method for manufacturing the same. Fuji Electric Device Technology, Rossi Kimms & McDowell, December 25, 2007: US07311983 (20 worldwide citation)

A perpendicular magnetic recording medium has a magnetic recording layer and laminated magnetic layers composed of different materials. In a first magnetic layer of the magnetic recording layer, ferromagnetic grains are surrounded by a nonmagnetic grain boundary region composed principally of oxide ...


2
Yasushi Sakai, Hiroyuki Uwazumi, Kazuo Enomoto, Sadayuki Watanabe: Fabrication method for perpendicular magnetic recording media. Fuji Electric Device Technology, December 22, 2009: US07635498 (16 worldwide citation)

A perpendicular magnetic recording medium and method thereof, includes a nonmagnetic substrate; a soft magnetic under layer; an intermediate layer; a bilayer magnetic recording layer; a protective layer; and a liquid lubricant layer. According to a following order, the soft magnetic under layer, the ...


3
Sadayuki Watanabe, Yasushi Sakai: Perpendicular magnetic recording medium, method of manufacturing same, and magnetic recording device. Fuji Electric Device Technology, Rossi Kimms & McDowell, February 24, 2009: US07494726 (6 worldwide citation)

A perpendicular medium is disclosed in which an isolation structure of an underlayer is formed using a simple method as in a conventional manufacturing process for a medium of continuous films. The method suppresses dispersion of alignment and reduced magnetic cluster size in a magnetic recording la ...


4
Sadayuki Watanabe, Yasushi Sakai: Method of producing a magnetic recording medium and a magnetic recording medium formed thereby. Fuji Electric, Rossi Kimms & McDowell, December 19, 2006: US07150895 (2 worldwide citation)

A perpendicular magnetic recording medium has a magnetic recording layer with ferromagnetic crystalline grains and nonmagnetic and nonmetallic grain boundary region surrounding the grains. The surface of its underlayer, before forming the magnetic recording layer, is exposed to an O2 or N2 atmospher ...


5
Sadayuki Watanabe: Magnetic recording medium. Fuji Electric, Rossi Kimms & McDowell, October 2, 2012: US08277961 (2 worldwide citation)

A magnetic recording medium for thermally assisted recording is disclosed which achieves both high density writing and good control of temperature characteristics. The magnetic recording medium for thermally assisted recording comprises an underlayer, a magnetic recording layer, and a protective lay ...


6
Yasushi Sakai, Kazuo Enomoto, Sadayuki Watanabe: Perpendicular magnetic recording medium. Morrison Law Firm, February 14, 2002: US20020018917-A1 (2 worldwide citation)

A perpendicular magnetic recording medium includes a multi-layer magnetic recording layer supported on a non-magnetic substrate. One of the magnetic recording layers includes a magnetic film of a rare earth-transitional metal alloy amorphous material. An embodiment of the rare earth-transitional met ...


7
Toyoji Ataka, Shunji Takenoiri, Sadayuki Watanabe, Hirohisa Oyama, Yasuaki Hozumi, Satoshi Takahashi: Perpendicular magnetic recording medium and method of manufacturing same. Fuji Electric, Rabin & Berdo P C, May 23, 2017: US09659592 (1 worldwide citation)

A perpendicular magnetic recording medium exhibits reduced noise and improved performance in such measures as SN ratio, and can realize high magnetic recording densities. In the perpendicular magnetic recording medium, at least a first nonmagnetic intermediate layer, second nonmagnetic intermediate ...


8
Sadayuki Watanabe: Magnetic recording medium having a patterned exchange-coupling control layer and method of manufacturing same. Fuji Electric Device Technology, Rossi Kimms & McDowell, April 12, 2011: US07923135 (1 worldwide citation)

A magnetic recording medium is formed by stacking in order, on a nonmagnetic base, at least an underlayer, magnetic recording layer, and protective layer. The magnetic recording layer includes a plurality of magnetic layers and an exchange-coupling control layer, and the magnetic recording medium is ...


9
Yasushi Sakai, Hiroyuki Uwazumi, Kazuo Enomoto, Sadayuki Watanabe: Perpendicular magnetic recording medium and fabrication method thereof. Fuji Electric, Staas & Halsey, July 5, 2005: US06913837 (1 worldwide citation)

A perpendicular magnetic recording medium and method thereof, includes a nonmagnetic substrate; a soft magnetic under layer; an intermediate layer; a bilayer magnetic recording layer; a protective layer; and a liquid lubricant layer. According to a following order, the soft magnetic under layer, the ...


10
Sadayuki Watanabe, Yasushi Sakai: Perpendicular magnetic recording medium and manufacturing method thereof. Fuji Electric Device Technology, Rossi Kimms & McDowell, May 16, 2006: US07045225 (1 worldwide citation)

A perpendicular magnetic recording suitable for mass production and having suppressed spike noise has at least a seed layer, an orientation controlling layer, an antiferromagnetic layer, a soft magnetic layer, a magnetic recording layer, a protective layer, and a liquid lubricant layer formed on a n ...



Click the thumbnails below to visualize the patent trend.