Richard R Dee

US Patent:

6674618, Jan 6, 2004

Filed:

Jun 22, 2001

Appl. No.:

09/887835

Inventors:

Bradley N. Engel - Louisville CO
Richard H. Dee - Louisville CO
Robert B. Chesnutt - Arvada CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 533

US Classification:

360325

Abstract:

A dual active element magnetoresistive tape read head uses weak biasing of active layers to reduce Barkhausen noise. The read head includes a first insulator layer. A first active magnetoresistive layer is built on the first insulator layer. A second insulator layer is built on the first active magnetoresistive layer. A second active magnetoresistive layer is on the second insulator layer. The second active magnetoresistive layer is magnetostatically coupled to the first active magnetoresistive layer. A third insulator layer is on the second active magnetoresistive layer. At least one insulator layer is a biasing layer comprised of an electrically nonconductive antiferromagnetic material.

US Patent:

6765770, Jul 20, 2004

Filed:

Oct 11, 2001

Appl. No.:

09/974037

Inventors:

Richard Henry Dee - Boulder CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5127

US Classification:

36032412

Abstract:

An apparatus and method in which a free layer of a spin valve sensor may be stabilized without using permanent magnets are provided. In one embodiment, the free layer is stabilized by a magnetic field applied to the free layer by a ferromagnetic layer pinned at 0 degrees. In an alternative embodiment, the magnetic field is applied by a synthetic antiferromagnetic layer. By eliminating the necessity of having permanent magnets, the drawbacks of these permanent magnets are also eliminated. The apparatus and method eliminate these drawbacks because, (a) layers used in the apparatus and method do not rely on any retention of magnetization; (b) the effect of an effective applied field is not sensitive to adjacent magnetic structures such as shields; (c) there is no permanent magnetism to be altered or lost in the apparatus and method; and (d) the ferromagnetic exchange interaction effect of the apparatus and method is adjustable.

US Patent:

6943987, Sep 13, 2005

Filed:

Dec 27, 2002

Appl. No.:

10/330895

Inventors:

Robert M. Raymond - Boulder CO, US
Richard H. Dee - Boulder CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B021/02
G11B005/584

US Classification:

360121, 360 7712

Abstract:

A servo write head for magnetic tape is provided. The invention includes first and second non-magnetic substrates and first and second magnetic layers deposited between the non-magnetic substrates. A middle non-magnetic substrate is then deposited between the first and second magnetic layers and forms the magnetic gap. In one embodiment, non-magnetic protective layers are placed between the middle substrate and magnetic layers and form part of the gap. A contoured top layer of magnetic material is deposited across the other layers and substrates and has at least one recording gap, and wherein the top layer forms a magnetic pattern for writing a servo pattern to the tape.

US Patent:

7068464, Jun 27, 2006

Filed:

Mar 21, 2003

Appl. No.:

10/394876

Inventors:

Richard H. Dee - Boulder CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/02

US Classification:

360 90, 360134

Abstract:

Magnetic tape onto which information may be recorded on either side exhibits the risk of having information recorded on one side affect the opposite side when the two sides are adjacent, such as when the tape is wound in a tape pack. The chance that information recorded onto one surface of a double sided magnetic tape will affect information recorded on the other surface of the magnetic tape is reduced by keeping fields emanating from a recorded region less than about one-half the coercivity of the magnetic medium onto which the information is recorded.

US Patent:

7180699, Feb 20, 2007

Filed:

Mar 17, 2004

Appl. No.:

10/802491

Inventors:

Richard H. Dee - Boulder CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/02

US Classification:

360 90

Abstract:

A method and apparatus for increasing the capacity of magnetic media storage is disclosed. More specifically, an improved two-sided magnetic tape is disclosed. In one implementation, in order to mitigate pack winding problems, a trade-off can be made between the back-coat roughness of a side of the magnetic tape and the mechanical imprint of that roughness in the recording surface of that side (e. g. , compromise between roughness and recording density). For example, a recording density and coding scheme deemed appropriate for a relatively large recording head-to-media separation can be used for the “rougher” side of a two-sided tape, and the highest recording density achievable can be used for the “best” or smoothest side of the two-sided tape. Depending on the recording density/roughness match selected, an optimum capacity gain can be selected from a range of capacity gains with values between 1 and 2 (e. g. , 1

US Patent:

7474513, Jan 6, 2009

Filed:

Jun 29, 2005

Appl. No.:

11/169387

Inventors:

John P. Nibarger - Superior CO, US
Richard H. Dee - Boulder CO, US

Assignee:

Storage Technology Corp. - Louisville CO

International Classification:

G11B 5/39

US Classification:

360323

Abstract:

A magneto-resistive (MR) transducer is capable of reading data signals magnetically recorded on a tape. The transducer includes a head-tape interface (HTI) and a MR sensor adjacent to the HTI. An electro-static discharge (ESD) element is coupled to the MR sensor, which is adapted to provide an electrical path from the MR sensor to a lower potential structure.

US Patent:

7733603, Jun 8, 2010

Filed:

Feb 13, 2007

Appl. No.:

11/674443

Inventors:

Richard H. Dee - Boulder CO, US

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G11B 5/187

US Classification:

360122

Abstract:

A read and/or write head for a tape drive system has a tape bearing surface that includes relatively smooth areas surrounded by relatively rough areas. Read and/or write elements are located in the smooth areas.

US Patent:

20030002225, Jan 2, 2003

Filed:

Jun 29, 2001

Appl. No.:

09/894378

Inventors:

Richard Dee - Boulder CO, US

Assignee:

Storage Technology Corporation

International Classification:

G11B005/39

US Classification:

360/314000, 360/319000, 360/320000, 360/321000

Abstract:

Apparatus and methods for reducing the sensitivity of spin valve sensor read heads for magnetic tape applications are provided. The apparatus and methods compromise the large output gain derived from using state of the art spin valve sensors in order to reduce the flux capture and thus, the signal distortion in the spin valve sensor. In order to provide a reduced sensitivity spin valve sensor, one or more of the basic sensitivity of the spin valve, the flux carrying capability of the free layer, and the flux injection efficiency of the spin valve head structure are modified to reduce the flux capture by the sensing layer.

Author:

Richard Dee

ISBN #:

0771029713