Patents by Inventor Jyh-Shuey (Jerry) Lo
Jyh-Shuey (Jerry) Lo 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: 7489474Abstract: A magnetic head includes a first pole piece; a second pole piece; a pedestal formed over a central portion of the first pole piece; a gap separating the pedestal from the second pole piece; and at least one of a top straight walled portion over the pedestal and a bottom straight-walled portion underneath the pedestal, the pedestal being notched with angled side walls.Type: GrantFiled: March 11, 2008Date of Patent: February 10, 2009Assignee: International Business Machines CorporationInventors: Wen-Chein David Hsiao, Jyh-Shuey Jerry Lo
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Patent number: 7480983Abstract: Two trim/notch milling steps are used to refine the track width that is defined by the second pole piece tip of a write head. The second milling step uses feedback gained after the first milling step to refine the P2B (pole P2 bottom width) dimension. A final milling step may be conducted after receiving feedback from the result of the second trim/notch milling step.Type: GrantFiled: May 28, 2004Date of Patent: January 27, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Jyh-Shuey Jerry Lo
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Publication number: 20080158731Abstract: A magnetic head having an improved fringing field and overwrite capability, and a method of making the same, are described.Type: ApplicationFiled: March 11, 2008Publication date: July 3, 2008Inventors: Wen-Chien David Hsiao, Jyh-Shuey Jerry Lo
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Patent number: 7391591Abstract: A magnetic head having an improved fringing field and overwrite capability, and a method of making the same, are described.Type: GrantFiled: August 11, 2005Date of Patent: June 24, 2008Assignee: International Business Machines CorporationInventors: Wen-Chein David Hsiao, Jyh-Shuey Jerry Lo
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Patent number: 7363698Abstract: Methods for creating a write head by forming a bump after the top pole is formed are provided. In one embodiment, a bottom pole is created out of a first layer. A non-magnetic gap material is applied to the surface of the wafer. A top pole is created out of a second layer. After creating the top pole, a bump is created. The bump is used to protect at least a portion of the first layer while etching to create a stray flux absorber.Type: GrantFiled: September 30, 2004Date of Patent: April 29, 2008Assignee: Hitachi Gobal Storage Technologies Inc.Inventors: Amanda Baer, Hamid Balamane, Daniel Wayne Bedell, Jyh-Shuey Jerry Lo, Vladimir Nikitin, Aron Pentek, Yvette Winton
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Patent number: 7343666Abstract: In one illustrative example, a method for use in making a magnetic write head includes the steps of forming a first pole piece layer of a first pole piece; forming a patterned resist over the first pole piece layer; electroplating a pedestal over the first pole piece layer within a channel of the patterned resist; electroplating a metal gap layer over the pedestal within the channel of the patterned resist; forming a resist channel shrinking film over the patterned resist; baking the resist channel shrinking film over the patterned to thereby reduce a width of the channel; removing the resist channel shrinking film; electroplating a second pole piece within the reduced-width channel of the patterned resist; removing the patterned resist; and milling the pedestal, using the second pole piece as a mask, to form a central notched pedestal having side walls with angled slopes.Type: GrantFiled: June 30, 2004Date of Patent: March 18, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kim Y. Lee, Jyh-Shuey Jerry Lo, Dennis Richard McKean
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Patent number: 7108796Abstract: A method for fabrication of magnetic write heads for disk drives in which a P1 layer is formed having a P1 Protrusion, the P1 Protrusion having a longitudinal reference axis. A gap layer is deposited on the P1 Protrusion and a layer of fill material is deposited on the gap layer. The fill material layer is shaped to form a mold which surrounds a hollow which is aligned with the longitudinal axis of the P1 Protrusion. This hollow in the fill material layer is filled with P2 pole material to form a P2 pole which is then automatically substantially aligned with the longitudinal axis of the P1 Protrusion.Type: GrantFiled: September 30, 2003Date of Patent: September 19, 2006Assignee: Hitachi Global Storage Technologies Netherlands, B.V.Inventors: Christopher W. Bergevin, James D. Jarratt, Jyh-Shuey Jerry Lo, Sue Siyang Zhang
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Patent number: 7086139Abstract: A pedestal is formed over a first pole piece layer and insulator materials are formed to surround it. A gap layer made of a non-magnetic insulator or metal is then formed over the pedestal and the insulator, followed by the optional formation of a seed layer. A second pole piece is formed over the gap layer with or without the seed layer by forming a patterned resist using E-beam lithography and electroplating second pole piece materials within the patterned resist. After milling to remove side portions of the gap layer and the optional seed layer, a chemical etch is performed to remove a top portion of the insulator materials. The pedestal is then notched and trimmed by ion milling using the second pole piece as a mask to form a central notched structure. Since the second pole piece is precisely centered over the pedestal prior to notching, the pedestal is notched symmetrically to form a notched structure having side walls with angled slopes.Type: GrantFiled: April 30, 2004Date of Patent: August 8, 2006Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kim Y. Lee, Jyh-Shuey Jerry Lo
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Patent number: 6947255Abstract: A magnetic head having an improved fringing field and overwrite capability, and a method of making the same, are described.Type: GrantFiled: March 22, 2002Date of Patent: September 20, 2005Assignee: International Business Machines CorporationInventors: Wen-Chein David Hsiao, Jyh-Shuey Jerry Lo
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Patent number: 6857181Abstract: First, second and third pole tip components of a write head are formed with the second pole tip located between the first and third components and a write gap layer located between the first and second pole tip components. The second pole tip is formed with a width that defines a track width of the write head. The third pole tip component is formed with top and bottom surfaces wherein the bottom surface interfaces a top surface of the second pole tip component and has a width equal to the track width and wherein the top surface of the third pole tip has a width greater than the track width.Type: GrantFiled: August 12, 2002Date of Patent: February 22, 2005Assignee: International Business Machines CorporationInventors: Jyh-Shuey (Jerry) Lo, Timothy J. Moran
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Patent number: 6747850Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks.Type: GrantFiled: November 24, 2000Date of Patent: June 8, 2004Assignee: International Buisness Machine CorporationInventors: Thomas Young Chang, Edward Hinpong Lee, Jyh-Shuey Jerry Lo
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Publication number: 20040027729Abstract: First, second and third pole tip components of a write head are formed with the second pole tip located between the first and third components and a write gap layer located between the first and second pole tip components. The second pole tip is formed with a width that defines a track width of the write head. The third pole tip component is formed with top and bottom surfaces wherein the bottom surface interfaces a top surface of the second pole tip component and has a width equal to the track width and wherein the top surface of the third pole tip has a width greater than the track width.Type: ApplicationFiled: August 12, 2002Publication date: February 12, 2004Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Jyh-Shuey (Jerry) Lo, Timothy J. Moran
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Publication number: 20030179498Abstract: A magnetic head having an improved fringing field and overwrite capability, and a method of making the same, are described.Type: ApplicationFiled: March 22, 2002Publication date: September 25, 2003Inventors: Wen-Chein David Hsiao, Jyh-Shuey Jerry Lo
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Patent number: 6539610Abstract: A high throughput method for producing the narrow track width inductive head is also provided, whereby the heads may be manufactured in substantial volumes. The new head may be merged or piggy-backed MR or GMR heads, comprising a first pole piece, P1, and a second pole piece, P2, and is distinctly characterized by write track width is significantly reduced by a preliminary ion milling process before P1 notching is performed. The preliminary step utilizes an ion milling process to trim the write track width, P2B, at an angle between 45 to 85 degrees from the wafer normal. The MR head may then undergo conventional P1 notching.Type: GrantFiled: July 14, 2000Date of Patent: April 1, 2003Assignee: International Business Machines CorporationInventors: Jyh-Shuey (Jerry) Lo, John I. Kim, Timothy J. Moran
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Patent number: 6473276Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks.Type: GrantFiled: November 24, 2000Date of Patent: October 29, 2002Assignee: International Business Machines CorporationInventors: Thomas Young Chang, Edward Hinpong Lee, Jyh-Shuey Jerry Lo
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Patent number: 6339872Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks.Type: GrantFiled: May 3, 2000Date of Patent: January 22, 2002Assignee: International Business Machines CorporationInventors: Thomas Young Chang, Edward Hinpong Lee, Jyh-Shuey Jerry Lo
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Patent number: 6278591Abstract: A method makes an inverted merged MR head with a second pole tip which is self-aligned with a top first pole tip. After forming a bottom first pole tip layer, a top first pole tip is frame plated thereon with a width that defines a track width of the merged MR head. A photoresist layer, which is employed in the frame plating of the top first pole tip, is then soft baked which causes a photoresist opening above the top first pole tip to have sloping side edges which form a recess. An electrically-conductive sacrificial layer, such as copper, is then plated into the recess on top of the top first pole tip and the photoresist is removed. A forming layer, such as alumina, is then deposited and lapped so that the forming layer and the sacrificial layer have top surfaces that are flush with respect to one another. The sacrificial layer is then removed by an etchant that will not attack the materials of the pole tips and the forming layer.Type: GrantFiled: June 12, 2000Date of Patent: August 21, 2001Assignee: International Business Machines CorporationInventors: Thomas Young Chang, Jyh-Shuey Jerry Lo
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Patent number: 6201670Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks.Type: GrantFiled: June 16, 1997Date of Patent: March 13, 2001Assignee: International Business Machines CorporationInventors: Thomas Young Chang, Edward Hinpong Lee, Jyh-Shuey Jerry Lo
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Patent number: 6158107Abstract: A method makes an inverted merged MR head with a second pole tip which is self-aligned with a top first pole tip. After forming a bottom first pole tip layer a top first pole tip is frame plated thereon with a width that defines a track width of the merged MR head. A photoresist layer, which is employed in the frame plating of the top first pole tip, is then soft baked which causes a photoresist opening above the top first pole tip to have sloping side edges which form a recess. An electrically-conductive sacrificial layer, such as copper, is then plated into the recess on top of the top first pole tip and the photoresist is removed. A forming layer, such as alumina, is then deposited and lapped so that the forming layer and the sacrificial layer have top surfaces that are flush with respect to one another. The sacrificial layer is then removed by an etchant that will not attack the materials of the pole tips and the forming layer.Type: GrantFiled: April 2, 1998Date of Patent: December 12, 2000Assignee: International Business Machines CorporationInventors: Thomas Young Chang, Jyh-Shuey Jerry Lo
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Patent number: 6069775Abstract: A method makes an inverted merged MR head with a second pole tip layer which is self-aligned with a top first pole tip layer. After forming a bottom first pole tip layer, which is relatively thin and relatively wide, a top first pole tip layer is formed thereon with a width that defines the track width of the merged MR head. A second pole tip forming layer is formed on the top first pole tip layer and layers adjacent both sides of the top first pole tip layer. The forming layer and the top first pole tip layer are lapped so that their top surfaces are flush with one another. Ion milling is then implemented to mill the top first pole tip layer at a faster rate than the forming layer causing a recess that is defined by a top surface of the top first pole tip layer and inclined surfaces of the forming layer immediately adjacent thereto.Type: GrantFiled: December 22, 1997Date of Patent: May 30, 2000Assignee: International Business Machines CorporationInventors: Thomas Young Chang, Jyh-Shuey Jerry Lo