Patents by Inventor Paul Christopher Dorsey
Paul Christopher Dorsey 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: 20240135969Abstract: Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with two soft underlayers (SULs) on opposing sides of a single heatsink layer. For example, a magnetic recording medium is provided that includes a lower SUL on a substrate. The lower SUL is configured and positioned within the medium to provide a first return path for magnetic flux from a magnetic recording head during a write operation. The medium also includes a heatsink layer on the lower SUL and an upper SUL on the heatsink layer. The upper SUL is configured and positioned within the medium to provide a second return path for magnetic flux from the magnetic recording head. A magnetic recording layer is provided on the upper SUL to store information during the write operation. Additional layers or films may be provided as well.Type: ApplicationFiled: July 24, 2023Publication date: April 25, 2024Inventors: Asif Bashir, Pierre-Olivier Jubert, Antony Ajan, Paul Christopher Dorsey
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Publication number: 20240096368Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and an underlayer on the heat sink layer. The underlayer includes an amount of an electrically conductive material between about 20 mole percent (mol %) and about 100 mol %. The magnetic recording medium further includes the plurality of magnetic recording layers on the underlayer. The plurality of magnetic recording layers includes a first magnetic recording layer that comprises FePt—Ag—X, wherein X is an oxide.Type: ApplicationFiled: September 15, 2022Publication date: March 21, 2024Inventors: Hua Yuan, Hoan Cong Ho, Paul Christopher Dorsey
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Publication number: 20240071416Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium. The HAMR medium includes a substrate, a heat sink layer on the substrate, and a plurality of magnetic recording layers on the heat sink layer. The plurality of magnetic recording layers includes a first magnetic layer and a second magnetic layer disposed on the first magnetic layer. The second magnetic layer includes FePt—Ag—Cu—X, wherein X is a segregant comprising BN. The HAMR medium can use BN-based segregants to improve a thermal gradient of the HAMR medium for better areal density capability (ADC) and enable the use of a MgO underlayer with reduced thickness.Type: ApplicationFiled: August 25, 2022Publication date: February 29, 2024Inventors: Hoan Cong Ho, Tomoko Seki, Paul Christopher Dorsey
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Publication number: 20240055019Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a magnetic recording layer on a magnesium oxide-titanium oxide (MTO) underlayer, where the MTO underlayer includes an additive material that chemically bonds with titanium. In some examples, the additive material includes iron-oxide, iron, carbon, or various aluminum oxides. By providing the additive material to the MTO that chemically bonds with the titanium of the MTO, diffusion of titanium from the MTO underlayer into the magnetic recording layer is mitigated to provide an improved recording layer that achieves improved areal densities. In some embodiments, an additional magnesium oxide-nitrogen underlayer is also provided, which may include more of the additive material.Type: ApplicationFiled: August 11, 2022Publication date: February 15, 2024Inventors: Hoan Cong Ho, Hua Yuan, Tomoko Seki, Paul Christopher Dorsey
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Patent number: 11900978Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a magnetic recording layer on a magnesium oxide-titanium oxide (MTO) underlayer, where the MTO underlayer includes an additive material that chemically bonds with titanium. In some examples, the additive material includes iron-oxide, iron, carbon, or various aluminum oxides. By providing the additive material to the MTO that chemically bonds with the titanium of the MTO, diffusion of titanium from the MTO underlayer into the magnetic recording layer is mitigated to provide an improved recording layer that achieves improved areal densities. In some embodiments, an additional magnesium oxide-nitrogen underlayer is also provided, which may include more of the additive material.Type: GrantFiled: August 11, 2022Date of Patent: February 13, 2024Assignee: Western Digital Technologies, Inc.Inventors: Hoan Cong Ho, Hua Yuan, Tomoko Seki, Paul Christopher Dorsey
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Patent number: 11869556Abstract: A heat-assisted magnetic recording (HAMR) disk has a magnetic recording layer (typically a FePt chemically-ordered alloy), a seed-thermal barrier layer (typically MgO) below the recording layer, a heat-sink layer, and an optical-coupling multilayer of alternating plasmonic and non-plasmonic materials between the heat-sink layer and the seed-thermal barrier layer. Unlike a heat sink layer, the multilayer has very low in-plane and out-of-plane thermal conductivity and thus does not function as a heat sink layer. The multilayer's low thermal conductivity allows the multilayer to also function as a thermal barrier. Due to the plasmonic materials in the multilayer it provides excellent optical coupling with the near-field transducer (NFT) of the HAMR disk drive.Type: GrantFiled: August 29, 2022Date of Patent: January 9, 2024Assignee: Western Digital Technologies, Inc.Inventors: Pierre-Olivier Jubert, Paul Christopher Dorsey, Hoan Cong Ho
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Patent number: 11758857Abstract: System and method for controlling an irrigation system using feedback from flow meters installed in an irrigation system are described. The system and method allows for automatic detection of the number of flow meters and their relation to controls valves attached to an irrigation system and for precise and reliable fluid flow measurements. Typical water flows for the system are learned and then compared to current water flows to detect water leaks (i.e., high water flow), malfunctioning control valves and/or low water flow and subsequently trigger electronic alerts to the user when system malfunctions are detected.Type: GrantFiled: July 15, 2020Date of Patent: September 19, 2023Assignee: HOT SOCKET, LLCInventors: Thomas Anthony O'Dell, Paul Christopher Dorsey
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Patent number: 11735217Abstract: Aspects of the present disclosure provide a heat assisted magnetic recording HAMR media structure and methods for reducing the Curie temperature distribution to improve the signal-to-noise characteristics of HAMR media. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and a magnetic recording layer on the heat sink layer. The magnetic recording layer includes a plurality of magnetic recording grains configured for recording and comprising a first magnetic alloy. The magnetic recording layer further includes a plurality of segregants disposed to isolate the plurality of magnetic recording grains and comprising a second magnetic alloy. A Curie temperature of the second magnetic alloy is higher than a Curie temperature of the first magnetic alloy.Type: GrantFiled: June 28, 2021Date of Patent: August 22, 2023Assignee: Western Digital Technologies, Inc.Inventors: Hua Yuan, Paul Christopher Dorsey
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Publication number: 20230238023Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a media carbon dual-layer media carbon overcoat with both a carbon layer and a carbon-nitrogen (CN) layer. The carbon layer may be a plasma enhanced chemical vapor deposition (PECVD) carbon layer and the CN layer may be a sputtered CN layer. The dual-layer media carbon overcoat helps reduce a laser power requirement of an HAMR disk drive system and thus reduce the operating temperature of a near field transducer (NFT) of a HAMR disk drive. The dual-layer overcoat can also improve thermal and thermo-oxidative stability of the media and help retain a lubricant provided on the overcoat, therefore improving HAMR head-media interface reliability. The dual-layer media carbon overcoat can also reduce carbonaceous smear within a head-media gap.Type: ApplicationFiled: January 5, 2023Publication date: July 27, 2023Inventors: Tan Duy Trinh, Yixiang Zhang, Sukumar Rajauria, Erhard Schreck, Qing Dai, Paul Christopher Dorsey
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Publication number: 20230048634Abstract: A heat-assisted magnetic recording (HAMR) disk has a magnetic recording layer (typically a FePt chemically-ordered alloy), a seed-thermal barrier layer (typically MgO) below the recording layer, a heat-sink layer, and an optical-coupling multilayer of alternating plasmonic and non-plasmonic materials between the heat-sink layer and the seed-thermal barrier layer. Unlike a heat sink layer, the multilayer has very low in-plane and out-of-plane thermal conductivity and thus does not function as a heat sink layer. The multilayer's low thermal conductivity allows the multilayer to also function as a thermal barrier. Due to the plasmonic materials in the multilayer it provides excellent optical coupling with the near-field transducer (NFT) of the HAMR disk drive.Type: ApplicationFiled: August 29, 2022Publication date: February 16, 2023Applicant: Western Digital Technologies, Inc.Inventors: Pierre-Olivier JUBERT, Paul Christopher DORSEY, Hoan Cong HO
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Publication number: 20230005503Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a magnesium (Mg) trapping layer that is configured to mitigate Mg migration in the HAMR medium so as to prevent near field transducer (NFT) damage caused by dissociated Mg reacting with a compound used in the NFT. In one example, the HAMR medium can include a substrate, a seed layer on the substrate and including MgO, a magnetic recording layer on the seed layer, and a Mg trapping layer on the substrate and configured to mitigate Mg migration from the seed layer to a surface of the HAMR medium above the magnetic recording layer.Type: ApplicationFiled: July 1, 2021Publication date: January 5, 2023Inventors: Takashi Iwanami, Kouji Matsuda, Junguo Xu, Kenji Tasaka, Hoan Cong Ho, Tomoko Seki, Paul Christopher Dorsey, Masayoshi Shimokoshi
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Patent number: 11521648Abstract: A heat-assisted magnetic recording (HAMR) medium has a multilayered underlayer between the heat-sink layer and the recording layer. One embodiment of the underlayer is a multilayer of a thermal barrier layer consisting essentially of MgO and TiO, and a seed layer containing MgO and nitrogen (N) directly on the thermal barrier layer, with the recording layer on and in contact with the seed layer. The interface between the thermal barrier layer and the seed layer contains Ti and N, some of which may be present as TiN to act as a diffusion barrier to prevent diffusion of the Ti into the recording layer. The Ti-containing thermal barrier layer has a higher thermal resistivity than the conventional MgO thermal barrier/seed layer and thus allows for reduced laser power to the recording layer while still achieving a high thermal gradient at the recording layer.Type: GrantFiled: February 9, 2021Date of Patent: December 6, 2022Assignee: Western Digital Technologies, Inc.Inventors: Hoan Cong Ho, Paul Christopher Dorsey, Tomoko Seki
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Patent number: 11437064Abstract: A heat-assisted magnetic recording (HAMR) disk has a magnetic recording layer (typically a FePt chemically-ordered alloy), a seed-thermal barrier layer (typically MgO) below the recording layer, a heat-sink layer, and an optical-coupling multilayer of alternating plasmonic and non-plasmonic materials between the heat-sink layer and the seed-thermal barrier layer. Unlike a heat sink layer, the multilayer has very low in-plane and out-of-plane thermal conductivity and thus does not function as a heat sink layer. The multilayer's low thermal conductivity allows the multilayer to also function as a thermal barrier. Due to the plasmonic materials in the multilayer it provides excellent optical coupling with the near-field transducer (NFT) of the HAMR disk drive.Type: GrantFiled: August 6, 2021Date of Patent: September 6, 2022Assignee: Western Digital Technologies, Inc.Inventors: Pierre-Olivier Jubert, Paul Christopher Dorsey, Hoan Cong Ho
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Publication number: 20220139422Abstract: A heat-assisted magnetic recording (HAMR) medium has a multilayered underlayer between the heat-sink layer and the recording layer. One embodiment of the underlayer is a multilayer of a thermal barrier layer consisting essentially of MgO and TiO, and a seed layer containing MgO and nitrogen (N) directly on the thermal barrier layer, with the recording layer on and in contact with the seed layer. The interface between the thermal barrier layer and the seed layer contains Ti and N, some of which may be present as TiN to act as a diffusion barrier to prevent diffusion of the Ti into the recording layer. The Ti-containing thermal barrier layer has a higher thermal resistivity than the conventional MgO thermal barrier/seed layer and thus allows for reduced laser power to the recording layer while still achieving a high thermal gradient at the recording layer.Type: ApplicationFiled: February 9, 2021Publication date: May 5, 2022Inventors: Hoan Cong Ho, Paul Christopher Dorsey, Tomoko Seki
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Publication number: 20210407543Abstract: Aspects of the present disclosure provide a heat assisted magnetic recording HAMR media structure and methods for reducing the Curie temperature distribution to improve the signal-to-noise characteristics of HAMR media. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and a magnetic recording layer on the heat sink layer. The magnetic recording layer includes a plurality of magnetic recording grains configured for recording and comprising a first magnetic alloy. The magnetic recording layer further includes a plurality of segregants disposed to isolate the plurality of magnetic recording grains and comprising a second magnetic alloy. A Curie temperature of the second magnetic alloy is higher than a Curie temperature of the first magnetic alloy.Type: ApplicationFiled: June 28, 2021Publication date: December 30, 2021Inventors: Hua Yuan, Paul Christopher Dorsey
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Patent number: 10955861Abstract: A circuit that can be used to add a flow meter to an existing set of wires that connects a controller to an electric valve. The circuit does not require the need to run additional wiring from the controller to the valve and flow meter. The circuit creates pulses of current with a rate that is proportional to the flow, which are then transmitted to a receiver and converted to a flow measurement output to the user by a controller.Type: GrantFiled: March 19, 2018Date of Patent: March 23, 2021Assignee: HOT SOCKET, LLCInventors: Thomas Anthony O'Dell, Paul Christopher Dorsey
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Publication number: 20200344963Abstract: System and method for controlling an irrigation system using feedback from flow meters installed in an irrigation system are described. The system and method allows for automatic detection of the number of flow meters and their relation to controls valves attached to an irrigation system and for precise and reliable fluid flow measurements. Typical water flows for the system are learned and then compared to current water flows to detect water leaks (i.e., high water flow), malfunctioning control valves and/or low water flow and subsequently trigger electronic alerts to the user when system malfunctions are detected.Type: ApplicationFiled: July 15, 2020Publication date: November 5, 2020Inventors: Thomas Anthony O'Dell, Paul Christopher Dorsey
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Patent number: 10796719Abstract: A heat-assisted magnetic recording (HAMR) medium has a non-magnetic multilayered overcoat on the recording layer. The overcoat includes a heat-dissipation layer, a diamond-like carbon (DLC) layer on and in contact with the heat-dissipation layer, and an optional interface layer between and in contact with the recording layer and the heat-dissipation layer. The heat-dissipation layer is a material with relatively high in-plane thermal conductivity, substantially higher than the in-plane thermal conductivity of both the DLC layer and the recording layer. The heat-dissipation layer laterally spreads the heat generated in the DLC layer by absorption of light from the near-field transducer to thereby reduce the temperature of the DLC layer. The optional interface layer is a material with relatively low thermal conductivity and increases the thermal resistance between the recording layer and the heat-dissipation layer.Type: GrantFiled: March 6, 2018Date of Patent: October 6, 2020Assignee: Western Digital Technologies, Inc.Inventors: Pierre-Olivier Jubert, Paul Christopher Dorsey
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Patent number: 10736280Abstract: System and method for controlling an irrigation system using feedback from flow meters installed in an irrigation system are described. The systems and method allows for automatic detection of the number of flow meters and their relation to controls valves attached to an irrigation system and for precise and reliable fluid flow measurements. Typical water flows for the system are learned and then compared to current water flows to detect water leaks (i.e., high water flow), malfunctioning control valves and/or low water flow and subsequently trigger electronic alerts to the user when system malfunctions are detected.Type: GrantFiled: August 7, 2018Date of Patent: August 11, 2020Assignee: HOT SOCKETT, LLCInventors: Thomas Anthony O'Dell, Paul Christopher Dorsey
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Patent number: 10650854Abstract: A heat-assisted magnetic recording (HAMR) medium has a heat-sink layer, a chemically-ordered FePt (or CoPt) alloy magnetic layer and a MgNiO intermediate layer between the heat-sink layer and the magnetic layer. The intermediate layer is a solid substitution crystalline alloy of the form (Mg(100-y)Niy)O, where y is less than 10 and greater than or equal to 0.5. The magnetic layer may be formed directly on the MgNiO intermediate layer, in which case the MgNiO intermediate layer functions as both a seed layer and a thermal barrier layer. The HAMR medium may also include an optional layer of crystalline “pure” MgO directly below or directly above the MgNiO intermediate layer. If the MgO layer is located directly above the MgNiO intermediate layer then the MgNiO intermediate layer functions primarily as a thermal barrier layer. The HAMR medium with the MgNiO intermediate layer provides a substantial improvement in corrosion resistance.Type: GrantFiled: April 17, 2017Date of Patent: May 12, 2020Assignee: Western Digital Technologies, Inc.Inventors: Hua Yuan, Paul Christopher Dorsey, Fenghua Zong, Shahid Ali Pirzada, Allen Joseph Bourez, Zhaoqiang Bai