Patents by Inventor Michael E. Devillier
Michael E. Devillier 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: 7095585Abstract: An information storage system includes a transducer having a loop of ferromagnetic material with pole tips separated by an nonferromagnetic gap located adjacent to a medium such as a rigid disk. During writing the separation between the pole tips and the media layer of the disk is a small fraction of the gap separation. Due to the small separation between the pole tips and the media layer, the magnetic field generated by the transducer and felt by the media has a larger perpendicular than longitudinal component, favoring perpendicular recording over longitudinal recording. The media may have an easy axis of magnetization oriented substantially along the perpendicular direction, so that perpendicular data storage is energetically favored. The transducer may also include a magnetoresistive sensor for reading magnetic information from the disk.Type: GrantFiled: October 20, 2004Date of Patent: August 22, 2006Assignee: Seagate Technology LLCInventors: Alexander P. Payne, William C. Cain, Michael E. Devillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Dimitre A. Latev, David D. Roberts
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Patent number: 6535361Abstract: A hard disk drive head operates in close proximity and dynamic contact with a rapidly spinning rigid disk surface, the head including a transducer with a magnetically permeable path between a poletip disposed adjacent to the disk surface and a magnetoresistive (MR) sensor situated outside the range of thermal noise generated by the surface contact. The magnetically permeable path is the same as that used to write data to the disk, eliminating errors that occur in conventional transducers having MR sensors at a separate location from the writing poletips. Moreover, the magnetically permeable path is preferably formed in a low profile, highly efficient “planar” loop that allows for manufacturing tolerances in throat height and wear of the terminal poletips from disk contact without poletip saturation or poletip smearing. The MR layer is formed in one of the first manufacturing steps atop the substrate, so that the MR layer has a relatively uniform planar template that is free from contaminants.Type: GrantFiled: February 28, 2001Date of Patent: March 18, 2003Assignee: Censtor Corp.Inventors: William C. Cain, Michael E. Devillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Dimitre A. Latev
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Patent number: 6493191Abstract: A transducer for a hard disk drive system has a planar magnetic core and a pair of poletips that project transversely from the core for sliding contact with the disk during reading and writing. The transducer is formed entirely of thin films in the shape of a low profile table having three legs that slide on the disk, the poletips being exposed at a bottom of one of the legs for high resolution communication with the disk, the throat height of the poletips affording sufficient tolerance to allow for wear. The legs elevate the transducer from the disk sufficiently to minimize lifting by a thin air layer that moves with the spinning disk which, in combination with the small size of the thin film head allows a low load and a flexible beam and gimbal to hold the transducer to the disk.Type: GrantFiled: September 15, 1995Date of Patent: December 10, 2002Assignee: Censtor CorporationInventors: William C. Cain, Richard D. Anderson, Michael A. Baldwinson, Keith R. Berding, Michael E. Devillier, Garrett A. Garrettson, Randolph S. Gluck, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Kwang K. Kim, Dimitre A. Latev, Alexander P. Payne, David D. Roberts
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Publication number: 20020093761Abstract: An information storage system includes a transducer having a loop of ferromagnetic material with pole tips separated by an nonferromagnetic gap located adjacent to a medium such as a rigid disk. During writing the separation between the pole tips and the media layer of the disk is a small fraction of the gap separation. Due to the small separation between the pole tips and the media layer, the magnetic field generated by the transducer and felt by the media has a larger perpendicular than longitudinal component, favoring perpendicular recording over longitudinal recording. The media may have an easy axis of magnetization oriented substantially along the perpendicular direction, so that perpendicular data storage is energetically favored. The transducer may also include a magnetoresistive sensor for reading magnetic information from the disk.Type: ApplicationFiled: November 19, 2001Publication date: July 18, 2002Inventors: Alexander P. Payne, William C. Cain, Michael E. Devillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Dimitre A. Latev, David D. Roberts
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Publication number: 20010055183Abstract: A hard disk drive head operates in close proximity and dynamic contact with a rapidly spinning rigid disk surface, the head including a transducer with a magnetically permeable path between a poletip disposed adjacent to the disk surface and a magnetoresistive (MR) sensor situated outside the range of thermal noise generated by the surface contact. The magnetically permeable path is the same as that used to write data to the disk, eliminating errors that occur in conventional transducers having MR sensors at a separate location from the writing poletips. Moreover, the magnetically permeable path is preferably formed in a low profile, highly efficient “planar” loop that allows for manufacturing tolerances in throat height and wear of the terminal poletips from disk contact without poletip saturation or poletip smearing. The MR layer is formed in one of the first manufacturing steps atop the substrate, so that the MR layer has a relatively uniform planar template that is free from contaminants.Type: ApplicationFiled: February 28, 2001Publication date: December 27, 2001Inventors: William C. Cain, Michael E. Devillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Dimtre A. Latev
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Patent number: 6320725Abstract: An information storage system having a ring head sliding on a rigid magnetic storage disk in such close proximity that the magnetic field felt by the media layer or layers of the disk has a larger perpendicular than longitudinal component so that data is stored in a perpendicular mode. The head to media separation during writing of data to the media is a small fraction of the amagnetic gap separating the poletips of the head. Reading of data may be inductive or may be via a magnetoresistive sensor which is coupled to the magnetically permeable core of the ring head far from the poletips. The media preferably has a high perpendicular anisotropy.Type: GrantFiled: December 22, 1995Date of Patent: November 20, 2001Assignee: Censtor CorporationInventors: Alexander P. Payne, William C. Cain, Michael E. DeVillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Mark A. Lauer, Dimitre A. Latev, David D. Roberts
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Patent number: 6212047Abstract: An information storage system having a ring head in such close proximity to a rigid magnetic storage disk that the magnetic field felt by the media layer or layers of the disk has a larger perpendicular than longitudinal component so that data is stored in a perpendicular mode. Reading of data is accomplished with a magnetoresistive sensor which may be coupled to the magnetically permeable core of the ring head far from the poletips, which may contact the disk. The media preferably has a high perpendicular anisotropy, and may be formed in a plurality of films with crystalline structures traversing the films.Type: GrantFiled: December 20, 1996Date of Patent: April 3, 2001Assignee: Censtor CorporationInventors: Alexander P. Payne, William C. Cain, Michael E. Devillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Dimitre A. Latev, Mark A. Lauer, David D. Roberts
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Patent number: 6198607Abstract: A hard disk drive head operates in close proximity and dynamic contact with a rapidly spinning rigid disk surface, the head including a transducer with a magnetically permeable path between a poletip disposed adjacent to the disk surface and a magnetoresistive (MR) sensor situated outside the range of thermal noise generated by the surface contact. The magnetically permeable path is the same as that used to write data to the disk, eliminating errors that occur in conventional transducers having MR sensors at a separate location from the writing poletips. Moreover, the magnetically permeable path is preferably formed in a low profile, highly efficient “planar” loop that allows for manufacturing tolerances in throat height and wear of the terminal poletips from disk contact without poletip saturation or poletip smearing. The MR layer is formed in one of the first manufacturing steps atop the substrate, so that the MR layer has a relatively uniform planar template that is free from contaminants.Type: GrantFiled: October 2, 1996Date of Patent: March 6, 2001Assignee: Censtor CorporationInventors: William C. Cain, Michael E. Devillier, Harold J. Hamilton, Robert D. Hempstead, Darren T. Imai, Dimitre A. Latev
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Patent number: 5793577Abstract: A magnetic thin film head of the planar geometry type has a dielectric member located between facing ends of pole members in the gap region. The thickness of at least one of the pole members in the gap region is reduced by the dielectric member relative to the thickness of the remainder of the pole members. This dielectric member in the region of reduced thickness functions to increase the density of the magnetic flux in that region during recording, thereby improving the write capability of the head.Type: GrantFiled: November 1, 1996Date of Patent: August 11, 1998Assignee: Read-Rite CorporationInventors: Eric R. Katz, Michael E. Devillier