Patents by Inventor Weilu Xu
Weilu Xu 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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Publication number: 20170186593Abstract: Provided herein is an apparatus that includes a body with a top surface and a recess in the top surface. The top surface, excluding the recess, is substantially planar. The recess is confined to an area that is defined by an inner diameter of the top surface of the body.Type: ApplicationFiled: January 19, 2015Publication date: June 29, 2017Inventor: Weilu XU
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Patent number: 9418693Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.Type: GrantFiled: March 30, 2015Date of Patent: August 16, 2016Assignee: SEAGATE TECHNOLOGY LLCInventors: Weilu Xu, Miaogen Lu, Mariana Rodica Munteanu, Michael Z. Wu, Shanghsien A. Rou, Steve Kuo-Hsing Hwang, Edward T. Yen
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Patent number: 9190095Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.Type: GrantFiled: January 20, 2014Date of Patent: November 17, 2015Assignee: Seagate Technology LLCInventors: Shoutao Wang, Weilu Xu, Chung-hee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
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Publication number: 20150279400Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.Type: ApplicationFiled: March 30, 2015Publication date: October 1, 2015Inventors: Weilu Xu, Miaogen Lu, Mariana Rodica Munteanu, Michael Z. Wu, Shanghsien A. Rou, Steve Kuo-Hsing Hwang, Edward T. Yen
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Patent number: 8993073Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.Type: GrantFiled: July 14, 2008Date of Patent: March 31, 2015Assignee: Seagate Technology LLCInventors: Weilu Xu, Miaogen Lu, Mariana R. Munteanu, Michael Z. Wu, Shanghsien Alex Rou, Steve Kuo-Hsing Hwang, Ed Yen
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Publication number: 20150015353Abstract: The embodiments disclose an alternating current (AC) erase process configured to cancel out existing polarity of stack magnetic features on both sides of the stack and an AC reset process configured to initialize the polarity of the device stack magnetic features of both sides of a stack configured to create a uniform polarity.Type: ApplicationFiled: October 16, 2013Publication date: January 15, 2015Applicant: Seagate Technology LLCInventors: Stephen Keith McLaurin, Weilu Xu
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Publication number: 20150015991Abstract: The embodiments disclose an orientation control bias point coupled to a magnetic index mark and having a bias point offset set at predetermined coordinates configured to substantially prevent concentricity run-out.Type: ApplicationFiled: October 16, 2013Publication date: January 15, 2015Applicant: Seagate Technolgy LLCInventors: Stephen Keith McLaurin, Weilu Xu
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Publication number: 20140186658Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.Type: ApplicationFiled: January 20, 2014Publication date: July 3, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Shoutao Wang, Weilu Xu, Chung-hee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
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Patent number: 8696874Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.Type: GrantFiled: February 7, 2012Date of Patent: April 15, 2014Assignee: Seagate Technology LLCInventors: Shoutao Wang, Weilu Xu, Chunghee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
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Patent number: 8685547Abstract: Aspects are directed to recording media with enhanced magnetic properties for improved writability. Examples can be included or related to methods, systems and components that allow for improved writability while reducing defects so as to obtain uniform magnetic properties such as uniformly high anisotropy and narrow switching field distribution. Some examples include a recording medium with an exchange tuning layer inserted between the hard layer and the soft, semi-soft or thin semi-hard layer so as to maximize the writability improvement of the media. Preferably, the exchange tuning layer is granular and reduces or optimizes the vertical coupling between the hard layer and the soft, semi-soft or semi-hard layer of a magnetic recording or storing device.Type: GrantFiled: February 19, 2009Date of Patent: April 1, 2014Assignee: Seagate Technology LLCInventors: Bo Bian, Shoutao Wang, Weilu Xu, Abebe Hailu, Miaogen Lu, Charles C. Chen, Thomas Patrick Nolan, Alexander Yulievich Dobin
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Publication number: 20130280556Abstract: Provided herein, is an apparatus that includes a nonmagnetic substrate having a surface; and a plurality of overlying thin film layers forming a layer stack on the substrate surface. The layer stack includes a magnetically hard perpendicular magnetic recording layer structure and an underlying soft magnetic underlayer (SUL), wherein the sum of a magnetic thickness of the layer stack is a magnetic thickness of up to about 2 memu/cm?2.Type: ApplicationFiled: June 17, 2013Publication date: October 24, 2013Inventors: Li Tang, Weilu Xu, Youfeng Zheng, Shanghsien Rou, Connie Chunling Liu, Jianhua Xue, Li-Lien Lee, Thomas P. Nolan
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Patent number: 8465854Abstract: A perpendicular magnetic recording medium comprises a non-magnetic substrate having a surface; and a plurality of overlying thin film layers forming a layer stack on the substrate surface, the layer stack including a magnetically hard perpendicular magnetic recording layer structure and an underlying soft magnetic underlayer (SUL), the SUL having a thickness of up to about 100 ?. Also disclosed is a data/information recording, storage, and retrieval system comprising the perpendicular magnetic recording medium and a single-pole magnetic transducer head including main and auxiliary poles positioned in spaced adjacency to an upper surface of the layer stack, the single-pole transducer head comprising a front shield adjacent the main pole.Type: GrantFiled: December 1, 2006Date of Patent: June 18, 2013Assignee: Seagate Technology LLCInventors: Li Tang, Weilu Xu, Youfeng Zheng, Shanghsien Rou, Connie Chunling Liu, Jianhua Xue, Li-Lien Lee
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Publication number: 20120141836Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.Type: ApplicationFiled: February 7, 2012Publication date: June 7, 2012Applicant: Seagate Technology LLCInventors: Shoutao Wang, Weilu Xu, Chunghee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
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Patent number: 8110299Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.Type: GrantFiled: February 27, 2009Date of Patent: February 7, 2012Assignee: Seagate Technology LLCInventors: Shoutao Wang, Weilu Xu, Chunghee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
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Patent number: 8025993Abstract: A perpendicular magnetic recording medium comprises a layer stack formed over a surface of a non-magnetic substrate, and comprising, in overlying sequence from the surface: a magnetically soft underlayer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer on the interlayer structure; wherein the interlayer structure is a triple-layer stacked structure comprising: a first interlayer of a first non-magnetic material proximal the magnetically soft underlayer and containing Ru; a second interlayer of a second non-magnetic material in overlying contact with the first interlayer and not containing Ru; and a third interlayer of a third non-magnetic material in overlying contact with the second interlayer and containing Ru.Type: GrantFiled: February 23, 2007Date of Patent: September 27, 2011Assignee: Seagate Technology LLCInventors: Abebe Hailu, Weilu Xu, Xiaoguang Ma, Chung-Hee Chang, Shoutao Wang, Charles C. Chen
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Publication number: 20100221580Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.Type: ApplicationFiled: February 27, 2009Publication date: September 2, 2010Inventors: Shoutao Wang, Weilu Xu, Chunghee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
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Publication number: 20100209737Abstract: Aspects are directed to recording media with enhanced magnetic properties for improved writability. Examples can be included or related to methods, systems and components that allow for improved writability while reducing defects so as to obtain uniform magnetic properties such as uniformly high anisotropy and narrow switching field distribution. Some examples include a recording medium with an exchange tuning layer inserted between the hard layer and the soft, semi-soft or thin semi-hard layer so as to maximize the writability improvement of the media. Preferably, the exchange tuning layer is granular and reduces or optimizes the vertical coupling between the hard layer and the soft, semi-soft or semi-hard layer of a magnetic recording or storing device.Type: ApplicationFiled: February 19, 2009Publication date: August 19, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Bo Bian, Shoutao Wang, Weilu Xu, Abebe Hailu, Miaogen Lu, Charles C. Chen, Thomas Patrick Nolan, Alexander Yulievich Dobin
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Publication number: 20100007989Abstract: An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.Type: ApplicationFiled: July 14, 2008Publication date: January 14, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Weilu Xu, Miaogen Lu, Mariana R. Munteanu, Michael Z. Wu, Shanghsien Alex Rou, Steve Kuo-Hsing Hwang, Ed Yen
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Publication number: 20080204933Abstract: A perpendicular magnetic recording medium comprises a layer stack formed over a surface of a non-magnetic substrate, and comprising, in overlying sequence from the surface: a magnetically soft underlayer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer on the interlayer structure; wherein the interlayer structure is a triple-layer stacked structure comprising: a first interlayer of a first non-magnetic material proximal the magnetically soft underlayer and containing Ru; a second interlayer of a second non-magnetic material in overlying contact with the first interlayer and not containing Ru; and a third interlayer of a third non-magnetic material in overlying contact with the second interlayer and containing Ru.Type: ApplicationFiled: February 23, 2007Publication date: August 28, 2008Inventors: Abebe Hailu, Weilu Xu, Xiaoguang Ma, Chung-Hee Chang, Shoutao Wang, Charles C. Chen
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Publication number: 20080131734Abstract: A perpendicular magnetic recording medium comprises a non-magnetic substrate having a surface; and a plurality of overlying thin film layers forming a layer stack on the substrate surface, the layer stack including a magnetically hard perpendicular magnetic recording layer structure and an underlying soft magnetic underlayer (SUL), the SUL having a thickness of up to about 100 ?. Also disclosed is a data/information recording, storage, and retrieval system comprising the perpendicular magnetic recording medium and a single-pole magnetic transducer head including main and auxiliary poles positioned in spaced adjacency to an upper surface of the layer stack, the single-pole transducer head comprising a front shield adjacent the main pole.Type: ApplicationFiled: December 1, 2006Publication date: June 5, 2008Inventors: Li Tang, Weilu Xu, Youfeng Zheng, Shanghsien Rou, Connie Chunling Liu, Jianhua Xue, Li-Lien Lee