Patents by Inventor Martin Gerard Forrester
Martin Gerard Forrester 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: 8227701Abstract: A reconfigurable electric circuit includes first and second crystalline material layers positioned adjacent to each other and forming a first interface, and a first ferroelectric layer positioned adjacent to the first crystalline material layer and having ferroelectric domains applying an electric field to regions of the first interface to induce a quasi two-dimensional electron gas in the regions, wherein at least one of the regions forms a gate and at least one of the regions forms a channel.Type: GrantFiled: January 26, 2009Date of Patent: July 24, 2012Assignee: Seagate Technology LLCInventors: Stephen John Wrazien, Florin Zavaliche, Joachim Walter Ahner, Tong Zhao, Martin Gerard Forrester, Shan Hu
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Patent number: 8000215Abstract: The presently disclosed technology teaches an improved voltage pattern for conductive tips utilized as moveable top electrodes for writing data bits into ferroelectric media. A conductive tip is dragged in contact or near contact with a ferroelectric surface forming a moveable top electrode on a ferroelectric media disk. A metallic film is deposited onto a bottom-side of the ferroelectric media forming a conductive bottom electrode. Applying electrical voltage pulses between the conductive tip and the bottom electrode induces polarization switching of the ferroelectric media under the head. The improved voltage pattern incorporates positive and negative overshoot voltages to induce a polarization switch in the ferroelectric media and positive and negative drag voltages to expand a polarized region on the ferroelectric media. Potential benefits of the improved voltage pattern include reduced cross-track blooming and reduced along-track blooming resulting in a more uniform track width and bit series length.Type: GrantFiled: August 12, 2009Date of Patent: August 16, 2011Assignee: Seagate Technology LLCInventors: Andreas Karl Roelofs, Tong Zhao, Martin Gerard Forrester
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Patent number: 7916513Abstract: A data storage device comprising a ferroelectric layer, a perovskite structure, and at least one sensor, where the perovskite structure has a polarity discontinuity configured to generate capacitance voltages in the perovskite structure based on polarization charges of the ferroelectric material, and where the at least one sensor is configured to read the capacitance voltages from the perovskite structure.Type: GrantFiled: November 5, 2008Date of Patent: March 29, 2011Assignee: Seagate Technology LLCInventors: Shan Hu, Tong Zhao, Florin Zavaliche, Joachim Ahner, Stephen John Wrazien, Martin Gerard Forrester
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Publication number: 20110038246Abstract: The presently disclosed technology teaches an improved voltage pattern for conductive tips utilized as moveable top electrodes for writing data bits into ferroelectric media. A conductive tip is dragged in contact or near contact with a ferroelectric surface forming a moveable top electrode on a ferroelectric media disk. A metallic film is deposited onto a bottom-side of the ferroelectric media forming a conductive bottom electrode. Applying electrical voltage pulses between the conductive tip and the bottom electrode induces polarization switching of the ferroelectric media under the head. The improved voltage pattern incorporates positive and negative overshoot voltages to induce a polarization switch in the ferroelectric media and positive and negative drag voltages to expand a polarized region on the ferroelectric media. Potential benefits of the improved voltage pattern include reduced cross-track blooming and reduced along-track blooming resulting in a more uniform track width and bit series length.Type: ApplicationFiled: August 12, 2009Publication date: February 17, 2011Applicant: Seagate Technology, LLCInventors: Andreas Karl Roelofs, Tong Zhao, Martin Gerard Forrester
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Patent number: 7869335Abstract: An apparatus includes a first ferroelectric storage layer and a second ferroelectric storage layer adjacent the first ferroelectric storage layer. A coupling layer may be between the first ferroelectric storage layer and the second ferroelectric storage layer. The ferroelectric storage layers may be configured as a data storage medium for use in a data storage system. A related method is also disclosed.Type: GrantFiled: October 9, 2007Date of Patent: January 11, 2011Assignee: Seagate Technology LLCInventors: Markus Jan Peter Siegert, Andreas Karl Roelofs, Martin Gerard Forrester
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Patent number: 7821808Abstract: A data storage system comprises first and second storage layers, a reader and a writer. The first storage layer has a first coercive potential and a first polarization. The second storage layer has a second coercive potential that is less than the first coercive potential, and a second polarization that is coupled to the first polarization. The writer performs a write operation in which a write potential is imposed across the first and second storage layers, such that the first coercive potential is exceeded across the first storage layer and the second coercive potential is exceeded across the second storage layer. The reader performs a read operation in which a read potential is imposed across the first and second storage layers, such that the second coercive potential is exceeded across the second storage layer and the first coercive potential is not exceeded across the first storage layer.Type: GrantFiled: January 30, 2009Date of Patent: October 26, 2010Assignee: Seagate Technology LLCInventors: Tong Zhao, Martin Gerard Forrester, Florin Zavaliche, Joachim Ahner
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Patent number: 7813254Abstract: An apparatus comprises mechanically scanned ferroelectric data storage media. A scanning electrode contacts the scannable surface with a contact force. The ferroelectric data storage media generates a piezoelectric potential that is picked up by the electrode. The piezoelectric potential has a polarity that varies as a function of data polarity on the data storage media.Type: GrantFiled: February 8, 2007Date of Patent: October 12, 2010Assignee: Seagate Technology LLCInventors: Markus Jan Peter Siegert, Andreas Karl Roelofs, Martin Gerard Forrester
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Patent number: 7782741Abstract: Ferroelectric media includes a media surface that is scannable by a contact. The contact provides a read signal. A polarization pattern is written in first regions of the media surface. The polarization pattern represents position data. The first regions are selectively exposed to an energy source. The exposing provides an imprint to the polarization pattern that prevents subsequent erasure by the read signal.Type: GrantFiled: January 18, 2007Date of Patent: August 24, 2010Assignee: Seagate Technology LLCInventors: Andreas Karl Roelofs, Martin Gerard Forrester
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Publication number: 20100195369Abstract: A data storage system comprises first and second storage layers, a reader and a writer. The first storage layer has a first coercive potential and a first polarization. The second storage layer has a second coercive potential that is less than the first coercive potential, and a second polarization that is coupled to the first polarization. The writer performs a write operation in which a write potential is imposed across the first and second storage layers, such that the first coercive potential is exceeded across the first storage layer and the second coercive potential is exceeded across the second storage layer. The reader performs a read operation in which a read potential is imposed across the first and second storage layers, such that the second coercive potential is exceeded across the second storage layer and the first coercive potential is not exceeded across the first storage layer.Type: ApplicationFiled: January 30, 2009Publication date: August 5, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Tong Zhao, Martin Gerard Forrester, Florin Zavaliche, Joachim Ahner
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Publication number: 20100187583Abstract: A reconfigurable electric circuit includes first and second crystalline material layers positioned adjacent to each other and forming a first interface, and a first ferroelectric layer positioned adjacent to the first crystalline material layer and having ferroelectric domains applying an electric field to regions of the first interface to induce a quasi two-dimensional electron gas in the regions, wherein at least one of the regions forms a gate and at least one of the regions forms a channel.Type: ApplicationFiled: January 26, 2009Publication date: July 29, 2010Applicant: Seagate Technology LLCInventors: Stephen John Wrazien, Florin Zavaliche, Joachim Walter Ahner, Tong Zhao, Martin Gerard Forrester, Shan Hu
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Publication number: 20100110754Abstract: A data storage device comprising a ferroelectric layer, a perovskite structure, and at least one sensor, where the perovskite structure has a polarity discontinuity configured to generate capacitance voltages in the perovskite structure based on polarization charges of the ferroelectric material, and where the at least one sensor is configured to read the capacitance voltages from the perovskite structure.Type: ApplicationFiled: November 5, 2008Publication date: May 6, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Shan Hu, Tong Zhao, Florin Zavaliche, Joachim Ahner, Stephen John Wrazien, Martin Gerard Forrester
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Publication number: 20090092032Abstract: An apparatus includes a first ferroelectric storage layer and a second ferroelectric storage layer adjacent the first ferroelectric storage layer. A coupling layer may be between the first ferroelectric storage layer and the second ferroelectric storage layer. The ferroelectric storage layers may be configured as a data storage medium for use in a data storage system. A related method is also disclosed.Type: ApplicationFiled: October 9, 2007Publication date: April 9, 2009Applicant: Seagate Technology LLCInventors: Markus Jan Peter Siegert, Andreas Karl Roelofs, Martin Gerard Forrester
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Publication number: 20090010144Abstract: An apparatus includes a storage medium, a transducer including an electrode positioned along an axis and having a curved end positioned adjacent to the storage medium, a wear-resistant coating surrounding the electrode, and an actuator for providing relative movement between the storage medium and the transducer.Type: ApplicationFiled: July 2, 2007Publication date: January 8, 2009Applicant: Seagate Technology LLCInventors: Earl Chrzaszcz Johns, Corina Nistorica, Martin Gerard Forrester, Jay Zhao
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Patent number: 7447140Abstract: An apparatus comprises a ferroelectric storage medium, and a transducer for reading data from the ferroelectric storage medium and for writing data to the ferroelectric storage medium, wherein the transducer includes a substrate and a probe coupled to the substrate, wherein the probe includes a conductive element and a bilayer structure causing the probe to bend toward the ferroelectric storage medium.Type: GrantFiled: July 30, 2004Date of Patent: November 4, 2008Assignee: Seagate Technology LLCInventors: Mark Ian Lutwyche, Earl Chrzaszcz Johns, Martin Gerard Forrester, Mark David Bedillion, Andreas Karl Roelofs, Joachim Walter Ahner, Robert Earl Rottmayer, Andre Y L Liem, Edward S. Skalko, Xueshi Yang
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Publication number: 20080192528Abstract: An apparatus comprises mechanically scanned ferroelectric data storage media. A scanning electrode contacts the scannable surface with a contact force. The ferroelectric data storage media generates a piezoelectric potential that is picked up by the electrode. The piezoelectric potential has a polarity that varies as a function of data polarity on the data storage media.Type: ApplicationFiled: February 8, 2007Publication date: August 14, 2008Applicant: Seagate Technology LLCInventors: Markus Jan Peter Siegert, Andreas Karl Roelofs, Martin Gerard Forrester
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Publication number: 20080175133Abstract: Ferroelectric media includes a media surface that is scannable by a contact. The contact provides a read signal. A polarization pattern is written in first regions of the media surface. The polarization pattern represents position data. The first regions are selectively exposed to an energy source. The exposing provides an imprint to the polarization pattern that prevents subsequent erasure by the read signal.Type: ApplicationFiled: January 18, 2007Publication date: July 24, 2008Applicant: Seagate Technology LLCInventors: Andreas Karl Roelofs, Martin Gerard Forrester