Patents by Inventor Kevin Robert Coffey
Kevin Robert Coffey 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: 8228159Abstract: A resistor, fabricating method, and thermal sensor material for resistors that incorporate high Temperature Coefficient of Resistance (TCR) values and low resistivity for better sensitivity in infrared imaging applications are disclosed. Amorphous oxide thin films, preferably oxides of vanadium (VOx), were deposited on thermally grown silicon dioxide by direct current (DC) magnetron co-sputtering of noble metals (gold and platinum) in a controlled argon/oxygen atmosphere. The ideal conditions for preparing an amorphous vanadium oxide/noble metal thin film are identified. TCR and resistivity results showed that the additions of gold (Au) and platinum (Pt) into VOx reduced the resistivity. However, only gold (Au) was found to improve TCR value. Reducing the amount of oxygen in the thin film, further improved the ratio between TCR and resistivity. Infrared detection and imaging devices can be greatly improved with a “drop-in” amorphous vanadium oxide/noble metal thin film of the present invention.Type: GrantFiled: October 17, 2008Date of Patent: July 24, 2012Assignee: University of Central Florida Research Foundation, Inc.Inventors: Kevin Robert Coffey, Vu Huynh Lam, Edward Dein, Andrew Peter Warren, Glenn Boreman, Guy V. Zummo, Wilson Caba
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Patent number: 7170714Abstract: A magnetic head for thermally-assisted writing of data to a disk is disclosed. In one illustrative example, the magnetic head includes a write head element and a heating element which is a resistive infared radiator. The heating element is coupled to at least one via pad which is exposed on an outer surface of the magnetic head. This via pad may be the same pad utilized for the write head element or for a read sensor. The heating element is formed beneath or within the pole tip such that it is able to transfer heat to a portion of the disk before the write head element can write data to it Advantageously, the heater facilitates the writing of data to high coercivity media.Type: GrantFiled: October 17, 2005Date of Patent: January 30, 2007Assignee: International Business Machines CorporationInventors: Kevin Robert Coffey, Jeffrey Scott Lille, Andrew Ching Tam
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Patent number: 7006336Abstract: A magnetic head for thermally-assisted writing of data to a disk is disclosed. In one illustrative example, the magnetic head includes a write head element and a heating element which is a resistive infared radiator. The heating element is coupled to at least one via pad which is exposed on an outer surface of the magnetic head. This via pad may be the same pad utilized for the write head element or for a read sensor. The heating element is formed beneath or within the pole tip such that it is able to transfer heat to a portion of the disk before the write head element can write data to it Advantageously, the heater facilitates the writing of data to high coercivity media.Type: GrantFiled: August 6, 2002Date of Patent: February 28, 2006Assignee: International Business Machines CorporationInventors: Kevin Robert Coffey, Jeffrey Scott Lille, Andrew Ching Tam
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Patent number: 6982843Abstract: The invention discloses an assembly comprising an adjustable heat flux mechanism suitable for thermally assisted information processing and control. In one embodiment, the assembly discloses a directed energy source for heating a media, a temperature sensing element for measuring/inferring the temperature of the media, and a controller for mutually positioning the energy output by the directed energy source and the media for thereby controlling the power directed to the media in accordance with the temperature sensing element.Type: GrantFiled: August 17, 2001Date of Patent: January 3, 2006Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kevin Robert Coffey, Hendrik F. Hamann, Jan-Ulrich Thiele, Hemantha Kumar Wickramasinghe
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Patent number: 6950260Abstract: A magnetic recording system is provided having a write head employing a combination of magnetic write field gradient and thermal gradient to write data on a ‘thermal spring’ magnetic recording media. The write head comprises a magnetic element using a write current to induce a magnetic write field at the magnetic media and a thermal element using a very small aperture laser to heat a portion of the media. The thermal spring magnetic media comprises [comprises] first and second stacks providing two exchange coupled ferromagnetic layers having different Curie temperatures [The first stack has a high magneto-crystalline anisotropy, a relatively low saturation magnetization and a low Curie temperature.] [The second stack has a relatively low magneto-crystalline anisotropy, a high saturation magnetization and a high Curie temperature.Type: GrantFiled: June 4, 2001Date of Patent: September 27, 2005Assignee: Hitachi Global Technologies Netherlands B.V.Inventors: Kevin Robert Coffey, Robert Edward Fontana, Jr., Jan-Ulrich Thiele
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Patent number: 6881497Abstract: A thermal spring magnetic medium is provided having first and second stacks providing two exchange coupled ferromagnetic layers having different Curie temperatures. The first stack has a high magneto-crystalline anisotropy, a relatively low saturation magnetization and a low Curie temperature. The second stack has a relatively low magneto-crystalline anisotropy, a high saturation magnetization and a high Curie temperature. Preferably the first stack includes an alloy of Fe—Pt or Co—Pt, and the second stack includes an allow of Co—Pt or Co—Pd. A disk drive system having the novel medium is also provided.Type: GrantFiled: November 14, 2003Date of Patent: April 19, 2005Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kevin Robert Coffey, Jan-Ulrich Thiele, Dieter Klaus Weller
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Publication number: 20040185306Abstract: A magnetic recording system is provided having a write head employing a combination of magnetic write field gradient and thermal gradient to write data on a ‘thermal spring’ magnetic recording media. The write head comprises a magnetic element using a write current to induce a magnetic write field at the magnetic media and a thermal element using a very small aperture laser to heat a portion of the media. The thermal spring magnetic media comprises first and second stacks providing two exchange coupled ferromagnetic layers having different Curie temperatures. The first stack has a high magneto-crystalline anisotropy, a relatively low saturation magnetization and a low Curie temperature. The second stack has a relatively low magneto-crystalline anisotropy, a high saturation magnetization and a high Curie temperature.Type: ApplicationFiled: November 14, 2003Publication date: September 23, 2004Inventors: Kevin Robert Coffey, Jan-Ulrich Thiele, Dieter Klaus Weller
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Publication number: 20040027728Abstract: A magnetic head for thermally-assisted writing of data to a disk is disclosed. In one illustrative example, the magnetic head includes a write head element and a heating element which is a resistive infared radiator. The heating element is coupled to at least one via pad which is exposed on an outer surface of the magnetic head. This via pad may be the same pad utilized for the write head element or for a read sensor. The heating element is formed beneath or within the pole tip such that it is able to transfer heat to a portion of the disk before the write head element can write data to it Advantageously, the heater facilitates the writing of data to high coercivity media.Type: ApplicationFiled: August 6, 2002Publication date: February 12, 2004Inventors: Kevin Robert Coffey, Jeffrey Scott Lille, Andrew Ching Tam
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Publication number: 20030035234Abstract: The invention discloses an assembly comprising an adjustable heat flux mechanism suitable for thermally assisted information processing and control. In one embodiment, the assembly discloses a directed energy source for heating a media, a temperature sensing element for measuring/inferring the temperature of the media, and a controller for mutually positioning the energy output by the directed energy source and the media for thereby controlling the power directed to the media in accordance with the temperature sensing element.Type: ApplicationFiled: August 17, 2001Publication date: February 20, 2003Applicant: International Business Machines CorporationInventors: Kevin Robert Coffey, Hendrik F. Hamann, Jan-Ulrich Thiele, Hemantha Kumar Wickramasinghe
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Publication number: 20020191320Abstract: A magnetic recording system is provided having a write head employing a combination of magnetic write field gradient and thermal gradient to write data on a ‘thermal spring’ magnetic recording media. The write head comprises a magnetic element using a write current to induce a magnetic write field at the magnetic media and a thermal element using a very small aperture laser to heat a portion of the media. The thermal spring magnetic media comprises comprises first and second stacks providing two exchange coupled ferromagnetic layers having different Curie temperatures. The first stack has a high magneto-crystalline anisotropy, a relatively low saturation magnetization and a low Curie temperature. The second stack has a relatively low magneto-crystalline anisotropy, a high saturation magnetization and a high Curie temperature.Type: ApplicationFiled: June 4, 2001Publication date: December 19, 2002Applicant: International Business Machines CorporationInventors: Kevin Robert Coffey, Robert Edward Fontana, Jan-Ulrich Thiele
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Publication number: 20020192506Abstract: A magnetic recording system is provided having a write head employing a combination of magnetic write field gradient and thermal gradient to write data on a ‘thermal spring’ magnetic recording media. The write head comprises a magnetic element using a write current to induce a magnetic write field at the magnetic media and a thermal element using a very small aperture laser to heat a portion of the media. The thermal spring magnetic media comprises first and second stacks providing two exchange coupled ferromagnetic layers having different Curie temperatures. The first stack has a high magneto-crystalline anisotropy, a relatively low saturation magnetization and a low Curie temperature. The second stack has a relatively low magneto-crystalline anisotropy, a high saturation magnetization and a high Curie temperature.Type: ApplicationFiled: June 4, 2001Publication date: December 19, 2002Applicant: International Business Machines CorporationInventors: Kevin Robert Coffey, Jan-Ulrich Thiele, Dieter Klaus Weller
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Publication number: 20020098381Abstract: An alloy of tetragonal polycrystalline structure acts as a thin film magnetic medium. The medium can be for recording or sensing magnetic transitions representative of data and is of a thickness less than about 200 Å, and has a coercivity in excess of about 2000 Oe. The film is in the L1o phase which is suitable for longitudinal recording and can be constituted by an alloy selected from cobalt or iron together with platinum or palladium. The film is formed by sputtering from a target and thereafter annealing the thin film and at a temperature in excess of about 500° C.Type: ApplicationFiled: June 4, 1999Publication date: July 25, 2002Inventors: KEVIN ROBERT COFFEY, JAMES KENT HOWARD, MICHAEL ANDREW PARKER
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Patent number: 6016241Abstract: A heterogeneous thin film structure including a discontinuous layer of ferromagnetic material deposited on an insulating substrate and overcoated with a layer of nonmagnetic electrically conductive material exhibits giant magnetoresistance in saturation fields on the order of 350 Oersteds. A layer of ferromagnetic material is deposited on a heated insulating substrate by high vacuum evaporation techniques to form a layer of isolated ferromagnetic particles and overcoated with a nonmagnetic conductive material to form a plurality of ferromagnetic particles embedded in a nonmagnetic conductive matrix. As the ferromagnetic and nonmagnetic materials are deposited separately, it is not required that the two materials be immiscible and subsequent annealing is not required to induce phase separation.Type: GrantFiled: May 22, 1995Date of Patent: January 18, 2000Assignee: International Business Machines CorporationInventors: Kevin Robert Coffey, James Kent Howard, Todd Lanier Hylton, Michael Andrew Parker
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Patent number: 5989728Abstract: An alloy of tetragonal polycrystalline structure acts as a thin film magnetic medium. The medium can be for recording or sensing magnetic transitions representative of data and is of a thickness less than about 200 .ANG., and has a coercivity in excess of about 2000 Oe. The film is in the L1o phase which is suitable for longitudinal recording and can be constituted by an alloy selected from cobalt or iron together with platinum or palladium. The film is formed by sputtering from a target and thereafter annealing the thin film and at a temperature in excess of about 500.degree. C.Type: GrantFiled: June 12, 1996Date of Patent: November 23, 1999Assignee: International Business Machines CorporationInventors: Kevin Robert Coffey, James Kent Howard, Michael Andrew Parker