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WO2001067439A1 - Procede et appareil permettant de lire un support magnetique enregistre a l'aide d'un ensemble d'elements de lecture - Google Patents

Procede et appareil permettant de lire un support magnetique enregistre a l'aide d'un ensemble d'elements de lecture Download PDF

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Publication number
WO2001067439A1
WO2001067439A1 PCT/US2001/006867 US0106867W WO0167439A1 WO 2001067439 A1 WO2001067439 A1 WO 2001067439A1 US 0106867 W US0106867 W US 0106867W WO 0167439 A1 WO0167439 A1 WO 0167439A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
sensing
flux
head
magnetic media
Prior art date
Application number
PCT/US2001/006867
Other languages
English (en)
Inventor
Christian P. Marlowe
Original Assignee
Quetico Technologies, Inc.
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 Quetico Technologies, Inc. filed Critical Quetico Technologies, Inc.
Priority to AU2001240028A priority Critical patent/AU2001240028A1/en
Publication of WO2001067439A1 publication Critical patent/WO2001067439A1/fr

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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
    • G11B5/3945—Heads comprising more than one sensitive element
    • G11B5/3948—Heads comprising more than one sensitive element the sensitive elements being active read-out elements
    • G11B5/3958—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged in a single plane, e.g. "matrix" disposition
    • 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
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/37—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using galvano-magnetic devices, e.g. Hall-effect devices using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect
    • G11B5/376—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using galvano-magnetic devices, e.g. Hall-effect devices using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect in semi-conductors
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/37—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using galvano-magnetic devices, e.g. Hall-effect devices using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect
    • G11B5/376—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using galvano-magnetic devices, e.g. Hall-effect devices using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect in semi-conductors
    • G11B5/378—Integrated structures
    • 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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4907—Details for scanning
    • G11B5/4915—Structure of specially adapted heads
    • 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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing
    • G11B5/4976—Disposition of heads, e.g. matrix arrangement
    • 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

Definitions

  • the invention relates generally to reader heads for reading magnetic media and, more particularly, to a novel reader head employing a plurality of magnetic reader elements.
  • the invention pertains to the use of magneto-responsive materials traditionally know as either "Hall Effect” and/or “magneto-resistive” to read recorded information from a magnetic disk, tape or other magnetic storage medium.
  • MR and GMR read elements are designed and constructed such that the active, portion of the element is at the edge of the read element's respective substrate. This construction requires extensive and expensive edge finishing for the element to operate properly. Further, the conventional MR and GMR read elements are designed to operate as simple single switches which produce only a bi-polar output responsive to the presence of either positive or negative flux reversals. These flux reversals have multiple characteristics aside from either the positive or negative flux reversals, such as positive to neutral, neutral to negative, positive to positive and so on.
  • a magneto resistive (MR) reader head has a plurality of sensing elements mounted thereon is provided for reading magnetic fluctuations in magnetic media.
  • the sensing elements may include Hall elements that are configured to simultaneously sense a plurality magnetic fluctuations in a predefined area of magnetic media.
  • the magnetic fluctuations define binary data that is recorded by inducing magnetic fields onto the media.
  • the MR reader can sense a plurality of individual flux reversal characteristics in the magnetic media to more sensitively detect magnetic fluctuations located within the predetermined area of the recorded media. As a result, the data can be more easily read by the reader head with less error.
  • Figure 2 is a block diagram illustrating a single magneto resistive element used in an MR head
  • Figure 3 is a block diagram of a sensing element according to the invention.
  • Figure 6 is a block diagram illustrating an array of sensing elements according to the invention.
  • Figure 12 is a graphical diagram illustrating the negative to negative flux reversal transition of a single sensor element
  • Figure 14 is a graphical diagram illustrating a combination of three individual sensor's outputs
  • Figure 17 is a block diagram of a multi-sensing element device according to the invention.
  • an array of sensing elements 500 is illustrated, the elements 502-506 are the result of crossing legs 510-516.
  • the sensing elements are passed over flux reversals 508 that exist on the magnetic media, not shown.
  • the use of regressive analog delay lines 518-522 allows associated signals to be combined more or less simultaneously in mixed signal transducer 524.
  • the mixed signal transducer is can be configured to mix and combine the signals using methods well known in the art. In the case of the configuration of Figure 5, which has three sensing features, this delay would be no greater than approximately 1/3 the length of the flux reversal or 33.3 percent of the electric signal produced by the interaction of the flux reversal with the flux sensing feature.
  • Figure 5 schematically indicates the use of delay lines 518-522 and a signal processor shown as mixed signal transducer 524, configured to perform oversampling operations relative to a Phase Locked Loop "PLL" to cause the electric signal generated by the flux sensing portion of the magneto-responsive material for each flux reversal to be combined in a fashion to allow for resolving important characteristics of each individual flux reversal.
  • the important characteristics of each individual flux reversal include, but are not . limited to, polarity, period and amplitude.
  • Figure 5 further indicates the output of a usable signal 526 to be delivered to whatever processing device is employed for such purpose to make use of such signal.
  • Figures 4 and 5 may be dependent upon the use of a delay line for adequate resolution of the flux reversal into a usable digital signal. This is initially important in that the entire sensing structure can be fabricated on a single layer, which has substantial cost benefits relative to the current art. However, as the demand for more tightly packed sensing arrays becomes required, the crossing sensing elements can be produced in an overlapping fashion, as indicated in a section view provided as Figure 6.
  • magneto-responsive sensing elements 602,604,606 are fabricated in an overlapping configuration, (non-conductive/non-magnetic separating agent not shown)whereby each sensing element simultaneously senses each flux reversal 608 progressively, with the same percentage offsets as indicated previously.
  • each sensing element is active concurrently mooting the need for delay lines prior to signal combination for useful output.
  • the lines for voltage sensing as indicated as Vs+ and Vs- for each sensing element may be alternately into and out of the plane of the figure, or parallel to the motion of the flux reversals as required.
  • each individual magneto-responsive sensing element or tiles are "gross" analog sensors.
  • gross it is to be understood that the tiles, which generally are either of a similar cross sectional area or are smaller than the cross sectional area of the flux reversals to be resolved.
  • each individual tile is not capable of precisely resolving each individual flux reversal with certainty thus the requirement for more than one sensor tile to observe the flux characteristics of each flux reversal at slightly different positions as previously indicated.
  • the invention is directed to an apparatus
  • the invention is directed to an apparatus for sensing magnetic fluctuations in magnetic recorded media.
  • the invention may include a plurality of sensing elements such as Hall elements for sensing magnetic fluctuations on magnetic recorded media.
  • sensing elements such as Hall elements for sensing magnetic fluctuations on magnetic recorded media.
  • this is illustrative of only one utility of the invention, and that the invention has greater applicability and utility in many other applications where the sensing of magnetic fluctuations is involved.
  • Equivalent structures embodying the invention could be configured for such applications without diverting from the spirit and scope of the invention as defined in the appended claims..
  • this embodiment is described and illustrated in the context of a MR head for reading magnetic fluctuations on recorded magnetic media, the invention extends to other applications where sensitive detection of magnetic fluctuations is useful.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Magnetic Heads (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

L'invention concerne une tête de lecture (500) magnéto-résistive (MR) sur laquelle sont fixés plusieurs éléments Hall (502, 504, 506). Ces éléments Hall sont configurés pour détecter simultanément plusieurs fluctuations magnétiques (508) dans une zone prédéfinie d'un support magnétique. Ces fluctuations (508) définissent des données binaires enregistrées sur le support magnétique par induction de champs magnétiques dans ledit support. Les éléments Hall (502-506) permettent à la tête de lecture de détecter plusieurs caractéristiques d'inversement de flux individuel dans le support magnétique afin de détecter, de manière plus sensible, les fluctuations magnétiques placées dans la zone prédéterminée du support enregistré. Par conséquent, les données peuvent être lues plus facilement avec moins d'erreurs.
PCT/US2001/006867 2000-03-03 2001-03-02 Procede et appareil permettant de lire un support magnetique enregistre a l'aide d'un ensemble d'elements de lecture WO2001067439A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001240028A AU2001240028A1 (en) 2000-03-03 2001-03-02 Method and apparatus for reading recorded magnetic media using an array of reading elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/518,114 2000-03-02
US51811400A 2000-03-03 2000-03-03

Publications (1)

Publication Number Publication Date
WO2001067439A1 true WO2001067439A1 (fr) 2001-09-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/006867 WO2001067439A1 (fr) 2000-03-03 2001-03-02 Procede et appareil permettant de lire un support magnetique enregistre a l'aide d'un ensemble d'elements de lecture

Country Status (2)

Country Link
AU (1) AU2001240028A1 (fr)
WO (1) WO2001067439A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7502206B2 (en) 2006-07-24 2009-03-10 Hitachi Global Storage Technologies Netherlands B.V. Multiple extraordinary magnetoresistive (EMR) sensor utilizing both current leads
US9082436B1 (en) 2014-02-05 2015-07-14 HGST Netherlands B.V. Zig-zag MIMO head reducing space between three sensors

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715522A (en) * 1969-07-29 1973-02-06 Pioneer Electronic Corp Multi-track magnetic hall head
US3969769A (en) * 1974-04-29 1976-07-13 U.S. Philips Corporation Magneto-resistive head
US5786953A (en) * 1994-04-21 1998-07-28 U.S. Philips Corporation Arrangement for reproducing n digital signals having n phase-locked loops each including a phase shifter, controlled by an integrating element, arranged between a VCO output and a phase detector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715522A (en) * 1969-07-29 1973-02-06 Pioneer Electronic Corp Multi-track magnetic hall head
US3969769A (en) * 1974-04-29 1976-07-13 U.S. Philips Corporation Magneto-resistive head
US5786953A (en) * 1994-04-21 1998-07-28 U.S. Philips Corporation Arrangement for reproducing n digital signals having n phase-locked loops each including a phase shifter, controlled by an integrating element, arranged between a VCO output and a phase detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7502206B2 (en) 2006-07-24 2009-03-10 Hitachi Global Storage Technologies Netherlands B.V. Multiple extraordinary magnetoresistive (EMR) sensor utilizing both current leads
US9082436B1 (en) 2014-02-05 2015-07-14 HGST Netherlands B.V. Zig-zag MIMO head reducing space between three sensors
US9336802B2 (en) 2014-02-05 2016-05-10 HGST Netherlands B.V. Zig-zag MIMO head reducing space between three sensors

Also Published As

Publication number Publication date
AU2001240028A1 (en) 2001-09-17

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