Uwazumi
Hiroyuki Uwazumi, Yamanashi JP
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20100165509 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium, which includes a nonmagnetic substrate, and a soft magnetic layer, a first orientation control layer, a nonmagnetic intermediate layer, and a perpendicular magnetic recording layer formed sequentially on the nonmagnetic substrate. The perpendicular magnetic recording medium further includes a second orientation control layer provided between the first orientation control layer and the nonmagnetic intermediate layer. The nonmagnetic intermediate layer has hexagonal close-packed (hcp) structure. The first orientation control layer has a face-centered cubic (fcc) structure. The second orientation control layer includes Co and Cr, and has the hcp structure. | 07-01-2010 |
Hiroyuki Uwazumi, Nagano JP
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20090026066 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME AND PRODUCT THEREOF - The quantity of oxide contained in a magnetic layer is controlled to control the crystal grains and the segregation structure for ensuring low noise characteristic in a granular magnetic layer of a perpendicular magnetic recording medium. The granular magnetic layer consists of ferromagnetic crystal grains and a nonmagnetic grain boundary region mainly of an oxide surrounding the ferromagnetic crystal grains. The perpendicular magnetic recording medium has a nonmagnetic underlayer composed of a metal or alloy having hexagonal closest-packed crystal structure. The ferromagnetic crystal grain is composed of an alloy containing at least cobalt and platinum. The volume proportion of the nonmagnetic grain boundary region mainly of the oxide falls within a range of 15% to 40% of the volume of the total magnetic layer. | 01-29-2009 |
Hiroyuki Uwazumi, Minami- Alps City JP
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20080226950 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE MEDIUM - A perpendicular magnetic recording medium is disclosed in which a soft magnetic layer used as a low K | 09-18-2008 |
Hiroyuki Uwazumi, Osaki JP
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20130045395 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium according to which both the thermal stability of the magnetization is good and writing with a magnetic head is easy, and moreover the SNR is improved. In the case of a perpendicular magnetic recording medium comprising a nonmagnetic substrate ( | 02-21-2013 |
Yoshiaki Uwazumi, Hida-Shi JP
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20110031448 | Copper Powder for Conductive Paste and Conductive Paste - Copper powder is provided, which, while having fine granularity, does not loose either resistance to oxidation or balance in conductivity, and furthermore, copper powder for conductive paste in which variations in shape and granularity are small and having a low concentration in oxygen content. The copper powder for conductive paste contains 0.07 to 10 atomic % Al inside each copper particle in the powder. | 02-10-2011 |