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WO2000004550A3 - Method and apparatus for biasing a magnetoresistive head with constant power dissipation - Google Patents

Method and apparatus for biasing a magnetoresistive head with constant power dissipation Download PDF

Info

Publication number
WO2000004550A3
WO2000004550A3 PCT/US1999/016210 US9916210W WO0004550A3 WO 2000004550 A3 WO2000004550 A3 WO 2000004550A3 US 9916210 W US9916210 W US 9916210W WO 0004550 A3 WO0004550 A3 WO 0004550A3
Authority
WO
WIPO (PCT)
Prior art keywords
power dissipation
head
biasing
constant power
magnetoresistive head
Prior art date
Application number
PCT/US1999/016210
Other languages
French (fr)
Other versions
WO2000004550A2 (en
Inventor
Stefan A Ionescu
Bernardo Rub
Original Assignee
Seagate Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seagate Technology filed Critical Seagate Technology
Publication of WO2000004550A2 publication Critical patent/WO2000004550A2/en
Publication of WO2000004550A3 publication Critical patent/WO2000004550A3/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/0008—Magnetic conditionning of heads, e.g. biasing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
    • G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers
    • G11B2005/0018—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers by current biasing control or regulation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/455—Arrangements for functional testing of heads; Measuring arrangements for heads

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Heads (AREA)

Abstract

Methods and apparatus for biasing a magnetoresistive (MR) head (130) wherein the power dissipated by the MR head (130) is substantially constant are provided. A method of maintaining a constant power dissipation through the MR head (130) is provided wherein the head power dissipation is dynamically maintained at or near a desired level. Also provided is a disc drive (100) which includes a dynamic MR head power dissipation control loop (158) which continuously adjusts the bias current to achieve an essentially constant power dissipation through the MR head (130).
PCT/US1999/016210 1998-07-16 1999-07-15 Method and apparatus for biasing a magnetoresistive head with constant power dissipation WO2000004550A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9310198P 1998-07-16 1998-07-16
US60/093,101 1998-07-16

Publications (2)

Publication Number Publication Date
WO2000004550A2 WO2000004550A2 (en) 2000-01-27
WO2000004550A3 true WO2000004550A3 (en) 2002-09-26

Family

ID=22237099

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/016210 WO2000004550A2 (en) 1998-07-16 1999-07-15 Method and apparatus for biasing a magnetoresistive head with constant power dissipation

Country Status (1)

Country Link
WO (1) WO2000004550A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006000946A1 (en) 2004-06-22 2006-01-05 Koninklijke Philips Electronics N.V. A system for controlling the temperature in components

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6098504A (en) * 1983-10-31 1985-06-01 Fujitsu Ltd Data reproducing method of magneto-resistance effect type magnetic head
US5412518A (en) * 1993-12-16 1995-05-02 International Business Machines Corporation Individual MR transducer head/disk/channel adaptive bias current system
EP0829733A2 (en) * 1996-09-17 1998-03-18 International Business Machines Corporation Electronic magnetoresistive sensor biasing
EP0853310A2 (en) * 1997-01-13 1998-07-15 Hitachi, Ltd. Magnetic storage apparatus using a magnetoresistive element
US5790334A (en) * 1996-10-02 1998-08-04 International Business Machines Corporation Circuit and method for optimizing bias supply in a magnetoresistive head based on the thermal properties of the MR head itself

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6098504A (en) * 1983-10-31 1985-06-01 Fujitsu Ltd Data reproducing method of magneto-resistance effect type magnetic head
US5412518A (en) * 1993-12-16 1995-05-02 International Business Machines Corporation Individual MR transducer head/disk/channel adaptive bias current system
EP0829733A2 (en) * 1996-09-17 1998-03-18 International Business Machines Corporation Electronic magnetoresistive sensor biasing
US5790334A (en) * 1996-10-02 1998-08-04 International Business Machines Corporation Circuit and method for optimizing bias supply in a magnetoresistive head based on the thermal properties of the MR head itself
EP0853310A2 (en) * 1997-01-13 1998-07-15 Hitachi, Ltd. Magnetic storage apparatus using a magnetoresistive element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 246 (P - 393) 3 October 1985 (1985-10-03) *

Also Published As

Publication number Publication date
WO2000004550A2 (en) 2000-01-27

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