Patents by Inventor Jianzhong Shi
Jianzhong Shi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10020015Abstract: In various embodiments, a magnetic medium may be provided. The magnetic medium may include a substrate. The substrate may include a servo layer over the substrate. The servo layer may include a cap layer having a first coercivity. The servo layer may also include a granular layer having a second coercivity greater than the first coercivity. The servo layer may also include an intervening layer between the cap layer and the granular layer.Type: GrantFiled: September 16, 2014Date of Patent: July 10, 2018Assignee: Marvell International Ltd.Inventors: Jianzhong Shi, Jiang Feng Hu, Lionel Hanxiang Ng, Chun Lian Ong
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Publication number: 20160225395Abstract: In various embodiments, a magnetic medium may be provided. The magnetic medium may include a substrate. The substrate may include a servo layer over the substrate. The servo layer may include a cap layer having a first coercivity. The servo layer may also include a granular layer having a second coercivity greater than the first coercivity. The servo layer may also include an intervening layer between the cap layer and the granular layer.Type: ApplicationFiled: September 16, 2014Publication date: August 4, 2016Applicant: MARVELL INTERNATIONAL LTD.Inventors: Jianzhong SHI, Jiang Feng HU, Lionel Hanxiang NG, Chun Lian ONG
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Patent number: 9251831Abstract: In various embodiments, a recording medium may be provided. The recording medium may include a servo layer. The recording medium may further include a data recording layer. The recording medium may additionally include a crystal-like soft underlayer (SUL). The data recording layer and the servo layer may be on a same side of the crystal-like soft underlayer.Type: GrantFiled: July 19, 2013Date of Patent: February 2, 2016Assignee: Marvell International Ltd.Inventors: Jianzhong Shi, Wee Kiat Lim
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Patent number: 9236078Abstract: According to embodiments of the present invention, a method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) is provided. The method includes forming an underlayer on a substrate, the underlayer including a precursor material, epitaxially depositing an interlayer on the underlayer, forming a recording layer over the interlayer, and converting the precursor material to a converted material having a thermal conductivity that is higher than a thermal conductivity of the recording layer. According to further embodiments of the present invention, another method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) and a recording medium for heat-assisted-magnetic-recording (HAMR) are also provided.Type: GrantFiled: October 10, 2013Date of Patent: January 12, 2016Assignee: Agency for Science Technology and ResearchInventors: Jiangfeng Hu, Jianzhong Shi, Wai Lwin Phyoe, Tiejun Zhou, Kiat Min Cher
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Patent number: 9202512Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.Type: GrantFiled: August 31, 2012Date of Patent: December 1, 2015Assignee: Marvell International LTD.Inventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Publication number: 20150146322Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.Type: ApplicationFiled: August 31, 2012Publication date: May 28, 2015Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Patent number: 9007713Abstract: A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.Type: GrantFiled: September 23, 2014Date of Patent: April 14, 2015Assignee: Marvell International Ltd.Inventors: Zhimin Yuan, Bo Liu, Jianzhong Shi, Weidong Zhou
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Publication number: 20150009785Abstract: A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.Type: ApplicationFiled: September 23, 2014Publication date: January 8, 2015Inventors: Zhimin YUAN, Bo Liu, Jianzhong Shi, Weidong Zhou
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Publication number: 20140099517Abstract: According to embodiments of the present invention, a method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) is provided. The method includes forming an underlayer on a substrate, the underlayer including a precursor material, epitaxially depositing an interlayer on the underlayer, forming a recording layer over the interlayer, and converting the precursor material to a converted material having a thermal conductivity that is higher than a thermal conductivity of the recording layer. According to further embodiments of the present invention, another method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) and a recording medium for heat-assisted-magnetic-recording (HAMR) are also provided.Type: ApplicationFiled: October 10, 2013Publication date: April 10, 2014Inventors: Jiangfeng HU, Jianzhong Shi, Wai Lwin Phyoe, Tiejun Zhou, Kiat Min Cher
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Publication number: 20140030551Abstract: In various embodiments, a recording medium may be provided. The recording medium may include a servo layer. The recording medium may further include a data recording layer. The recording medium may additionally include a crystal-like soft underlayer (SUL). The data recording layer and the servo layer may be on a same side of the crystal-like soft underlayer.Type: ApplicationFiled: July 19, 2013Publication date: January 30, 2014Applicant: Agency for Science, Technology and ResearchInventors: Jianzhong SHI, Wee Kiat LIM
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Publication number: 20130128378Abstract: A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.Type: ApplicationFiled: November 21, 2012Publication date: May 23, 2013Inventors: Zhimin YUAN, Bo LIU, Jianzhong SHI, Weidong ZHOU
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Publication number: 20120082865Abstract: A method for forming magnetic media is provided. The method of forming the magnetic media includes forming a plurality of regions of resist material on a top surface of a substrate which defines a plurality of regions of exposed substrate on the top surface of the substrate between adjacent ones of the plurality of regions of resist material. The method also includes forming magnetic material on the plurality of regions of resist material and the plurality of regions of exposed substrate and depositing material over the magnetic material, the material encapsulating a portion of the magnetic material formed on the plurality of regions of exposed substrate. A magnetic recording medium formed in accordance with the method is also provided.Type: ApplicationFiled: September 30, 2011Publication date: April 5, 2012Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Jie DENG, Yunjie CHEN, Jianzhong SHI, Baoyu ZONG, Tianli HUANG, Siang Huei LEONG
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Publication number: 20080062561Abstract: Embodiments of the present invention provide solutions in the form of reducing the head to keeper spacing in a double-layered perpendicular magnetic recording medium, and improving the recording performance of the magnetic recording medium. A double-layered perpendicular magnetic recording medium and a method of fabricating the same are provided, for data storage devices and systems. The medium includes a base structure and a seedlayer disposed on the base structure. Further layers sequentially formed above the base structure are a soft magnetic underlayer, an intermediate layer and a magnetic recording layer. Because the soft magnetic underlayer is formed between the seedlayer and the intermediate layer, the seedlayer is excluded from the distance between the soft magnetic underlayer and the magnetic recording layer. The soft magnetic underlayer is therefore brought closer to the magnetic recording layer, providing a narrowed head-to-keeper spacing in a data storage system.Type: ApplicationFiled: August 23, 2007Publication date: March 13, 2008Inventors: Jianzhong Shi, S.N. Piramanayagam
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Publication number: 20070259215Abstract: A method is provided to fabricate a magnetic recording medium which has a magnetic recording layer with reduced grain size. Prior to forming the magnetic recording layer, an intermediate layer is firstly formed, with a boundary phase surrounding and isolating the grains in the intermediate layer. With the formation of the boundary phase, the grain size of the intermediate layer can be successfully reduced. A magnetic recording medium includes an intermediate layer and a magnetic recording layer formed on the intermediate layer. In the intermediate layer, there is formed of segregate grains and a boundary phase which surrounds and isolates the grains, The magnetic layer has magnetic grains formed following the structure of the intermediate layer. The magnetic layer therefore has a relatively smaller grain size than that of conventional medium.Type: ApplicationFiled: May 4, 2007Publication date: November 8, 2007Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Seidikkurippu Piramanayagam, Jianzhong Shi
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Patent number: 7118815Abstract: A novel method of manufacturing a novel recording media is disclosed. The manufacturing method includes obtaining a substrate having an inside diameter and an outside diameter and creating a radial profile of an intensive property, such as Hc, of a multilayer magnetic layer containing at least a first magnetic layer and a second magnetic layer deposited on the substrate, from the inside diameter to the outside diameter by forming a radial profile of an extensive property, such as MrT or T, of either the first magnetic layer or the second magnetic layer from the inside diameter to the outside diameter.Type: GrantFiled: February 5, 2004Date of Patent: October 10, 2006Assignee: Seagate Technology LLCInventors: Xiongwei Ji, Jianzhong Shi, Darren Soonkeong Ng, Kakeng Ling, Huitong Ng, Chinsoon Koh, Yuanda Randy Cheng, Steven Hiyoshi Sawaski
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Publication number: 20050175863Abstract: A novel method of manufacturing a novel recording media is disclosed. The manufacturing method includes obtaining a substrate having an inside diameter and an outside diameter and creating a radial profile of an intensive property, such as Hc, of a multilayer magnetic layer containing at least a first magnetic layer and a second magnetic layer deposited on the substrate, from the inside diameter to the outside diameter by forming a radial profile of an extensive property, such as MrT or T, of either the first magnetic layer or the second magnetic layer from the inside diameter to the outside diameter.Type: ApplicationFiled: February 5, 2004Publication date: August 11, 2005Applicant: SEGATE TECHNOLOGYInventors: Xiongwei Ji, Jianzhong Shi, Darren Ng, Kakeng Ling, Huitong Ng, Chinsoon Koh, Yuanda Cheng, Steven Sawaski
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Publication number: 20040262148Abstract: A system for sputtering uniformly thick films on a substrate is disclosed. The system includes a magnetron-sputtering cathode in a vacuum chamber, a gas inlet which injects processing gas at one end of the chamber, and a pump that pumps the processing gas from the other end of the chamber causing the process gas to flow across the substrate during processing. The magnetron-sputtering cathode includes a magnet array that is substantially circular. The magnets on the magnet array are positioned such that the gap between the magnets is smaller on the top of the array near the gas inlet than on the bottom of the array near the pump. The distribution of magnets creates a magnetic flux profile that results in more of the target being sputtered near the top of the cathode creating a thicker film at the top of the substrate.Type: ApplicationFiled: June 23, 2004Publication date: December 30, 2004Inventors: Yuanda Randy Cheng, Jianzhong Shi, Wah Meng Soh, Chee Yong Tan, Goeh Wee Chor, Ping Xu, Yeong Wah Chua, Chinsoon Koh, Stephen Hiroshi Sawasaki
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Patent number: 6730197Abstract: An oblique sputtering deposition apparatus is provided for preparing a thin film. A collimator having angled passages for filtering out particles from stray directions is placed between the substrate and the incident particle flux. The angle of the passages can be adjusted from about 0 to about 90° with respect to the substrate normal according to requirements. The oblique incidence of particle flux brings forms a column structure which is also angled.Type: GrantFiled: March 14, 2002Date of Patent: May 4, 2004Assignee: Data Storage InstituteInventors: Jian-Ping Wang, Jianzhong Shi
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Patent number: 6702930Abstract: A method of sputtering a target, comprising steps of: (a) providing a magnetically enhanced sputtering apparatus comprising a sputtering target having a first, sputtering surface and a second, opposing surface in electrical contact with a cathode electrode of the sputtering apparatus; (b) sputtering the first surface of the target to form a first erosion track therein; (c) removing the target from the sputtering apparatus when the first erosion track reaches a predetermined depth below the first surface; (d) reinstalling the sputtering target in the sputtering apparatus such that the second surface is the sputtering surface and the first surface is the opposing surface and is in electrical contact with the cathode via an intervening backing plate comprised of at least one material selected for causing a second erosion track to be formed in the second surface of the target during sputtering therefrom which is laterally displaced from the first erosion track; and (e) sputtering the second surface of the taType: GrantFiled: May 8, 2003Date of Patent: March 9, 2004Assignee: Seagate Technology LLCInventors: Yuanda Randy Cheng, Dennis Brown, Jianzhong Shi, Wee Ching Freddy Goh, Wah Meng John Soh, Steven Hiroshi Sawasaki
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Patent number: 6689253Abstract: A facing target sputtering apparatus, comprising: inner and outer spaced-apart, concentric, and coextensive tubular cathodes open at each end, with the inwardly facing surface of the outer cathode and the outwardly facing surface of the inner cathode; a first pair of ring-shaped magnet means extending around the outwardly facing surface of the outer cathode at the ends thereof, with a first polarity magnetic pole facing the outwardly facing surface; a second pair of ring-shaped magnet means extending around the inwardly facing surface of the inner cathode at the ends thereof, with a second, opposite polarity magnetic pole facing the inwardly facing surface; and a substrate positioned in spaced adjacency to an end of the inner and outer cathodes; wherein: magnetic flux lines from the first and second pairs of magnet means uni-directionally pass through portions of an annularly-shaped space between the ends of the inner and outer cathodes, and during sputtering operation, plasma is substantially confined tType: GrantFiled: June 13, 2002Date of Patent: February 10, 2004Assignee: Seagate Technology LLCInventors: Chinsoon Koh, Stephen Hiroshi Sawasaki, Jianzhong Shi, Yuanda Randy Cheng