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WO1989001685A1 - Agencement d'enregistrement magnetique a systeme d'alignement des pistes - Google Patents

Agencement d'enregistrement magnetique a systeme d'alignement des pistes Download PDF

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Publication number
WO1989001685A1
WO1989001685A1 PCT/EP1988/000142 EP8800142W WO8901685A1 WO 1989001685 A1 WO1989001685 A1 WO 1989001685A1 EP 8800142 W EP8800142 W EP 8800142W WO 8901685 A1 WO8901685 A1 WO 8901685A1
Authority
WO
WIPO (PCT)
Prior art keywords
tracks
storage device
head
magnetic
track
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP1988/000142
Other languages
German (de)
English (en)
Inventor
Eckhardt Hoenig
Heinrich Diepers
Herbert Schewe
Dietrich Stephani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1989001685A1 publication Critical patent/WO1989001685A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • 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
    • G11B5/488—Disposition of heads
    • G11B5/4886—Disposition of heads relative to rotating disc
    • 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
    • G11B5/58—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 with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—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 with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59683—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 with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks for magnetoresistive heads

Definitions

  • the invention relates to a magnetic storage device
  • a track guidance system which contains a servo head rigidly connected to the magnetic head for guiding the magnetic head along a data track and which is to be kept on at least one guide track by means of a downstream electronics.
  • High-density storage of information (data) in disk-shaped recording media is known both according to the principle of longitudinal (horizontal) and in particular according to the principle of vertical (vertical) magnetization (cf., for example, "IEEE Transactions on Magnetics", Vol MAG-16, No. 1, January 1980, pages 71 to 76 or Vol. MAG-20, No. 5, September 1984, pages 657 to 662 and 675 to 680).
  • the read / write magnetic heads to be used for these types of magnetization are advantageously formed using thin-film technology on non-magnetic substrates.
  • the distance between a magnetic head and the surface of the storage disk should be kept extremely small and, in particular in the case of a vertical type of magnetization, should be less than 1 ⁇ m. Such small distances can practically only be ensured by designing the substrate carrying the magnetic head as a missile which aerodynamically over that flies away beneath it - the disk.
  • the substrate on its underside facing the recording medium is advantageously equipped with corresponding glide or flight skids (cf. e.g. EP-A-0 137 051).
  • a so-called track positioner and, in general, also a track keeping system are required.
  • So-called linear or angular positioners in conjunction with a special servo plate are mainly used for track positioning.
  • This servo plate carries a fixed, inscribed grid of guide tracks. These tracks are read with the aid of a suitable servo head which, in rigid mechanical connection with the read / write magnetic head, ensures that this track grid is transferred to the data surface of the actual data storage disk and is accordingly found again during the reading process can.
  • the object of the present invention is therefore to design the magnetic storage device of the type mentioned at the outset in such a way that it can be used to ensure such a continuous tracking of its magnetic head.
  • this object is achieved in that guide tracks running separately along the data tracks are inscribed, each of which contains two parallel half tracks, which have antiparallel magnetization directions, and that the missile on its rear flat side with the servo Head is provided which contains a magnetoresistive sensor which is magnetically coupled to two magnetic legs which are assigned to at least one guide track.
  • the advantages associated with this configuration of the magnetic storage device are to be seen in particular in the fact that no additional servo plate is required for continuous guidance of the magnetic head, so that the drive system of the storage device and in particular the guidance of the magnetic head is correspondingly simplified.
  • the two guide tracks provided for guidance along a data track, which run parallel to each long side of a data track, can be kept very narrow. Since these guide tracks lie within the always present distance zones between adjacent data tracks, there is no loss of memory area associated therewith. This measure can even lead to a Gain storage space due to the very narrow spacing zones.
  • the two magnetic legs of the servo head can be positioned precisely over the guide tracks. In this case, even slight tilting of the entire missile with respect to the longitudinal axis of a data track, such as is caused, for example, by rotary positioners, can be tolerated.
  • the permanent guidance system is in terms of its concrete design, e.g. regarding his
  • “Feedback frequency” can be adapted to the conditions of the respective storage device.
  • the magnetic head can be easily positioned on a specific track by counting the guide tracks.
  • FIG. 1 shows a storage disk in FIG. 1, a section of which is shown enlarged in FIG.
  • FIG. 3 shows a double servo track in the storage disk.
  • a missile with a servo head is indicated in FIG.
  • FIG. 5 shows the arrangement of a part of this servo head over a storage disk.
  • FIG. 6 shows an agneto-resistive sensor of this servo head, of which the characteristic curve is shown in FIG.
  • Figure 8 shows an embodiment of a servo head with a magneto-resistive sensor.
  • FIGS. 9 and 10 each show a section through the servo head shown in FIG. 8. Corresponding parts are provided with the same reference symbols in the figures.
  • FIG. 1 shows an oblique view of a storage disk 2 of a magnetic storage device according to the invention, which is not detailed. A section of the disk surface 3 of this disk 2 is shown in FIG.
  • FIG. 2 For this in Figure 2 as a supervision of the disk upper ; 35
  • the area shown in the section shows five data tracks 4a to 4e, which consist of a material suitable for the magnetization principle selected. According to the selected exemplary embodiment, it is assumed that CoCr is to be magnetized vertically.
  • a data track section 5 with correspondingly magnetizable data blocks 5a to 5e is indicated by the data track 4c.
  • the width b of each data track perpendicular to the relative direction of movement v of a corresponding magnetic head with respect to the longitudinal direction of the track is in the order of approximately 10 ⁇ m.
  • a narrow spacing zone 7 is formed between adjacent data tracks and has a transverse dimension a of approximately 3 to 4 ⁇ m.
  • guide tracks 8 to 11 are written in the longitudinal direction, each consisting of two parallel, continuous half tracks.
  • the half-tracks are designated 8a, 8b to 11a, 11b and each have a transverse dimension q of a few ⁇ m.
  • the half tracks are generally immediately next to each other and are magnetized vertically in the opposite direction.
  • the two guide tracks adjacent to each data track are now to be used for track guidance by means of an appropriately designed servo head.
  • data track 4c for example, is assigned the two guide tracks 9 and 10.
  • the guide tracks which are adjacent to a data track in pairs can thus be viewed as a double servo track 12.
  • FIG. 3 shows a section which is made over two spacing zones 7 with the guide tracks 9 and 10 along a section line marked III-III in FIG.
  • the opposite magnetization directions of the half tracks 9a, 9b and 10a, 10b forming the guide track 9 or 10 are illustrated by arrowed lines 13a and 13b.
  • alternating magnetization directions are advantageously provided from the guide track to the guide track.
  • the direction of magnetization of the half tracks 9a and 10b or 9b and 10a is the same.
  • FIG. 4 shows an oblique view of a substrate designed as a missile 15 made of, for example, non-magnetic material. At the bottom of this missile two Klikufe ⁇ 16 and 17 are formed, the aerodynamic sliding of the
  • a servo head 20 designed according to the invention is arranged in the area of the flight skids 16 and in the area of the flight skids 17 a known read / write magnetic head 21 is arranged on the rear flat side 18, seen in the relative movement direction v of the missile with respect to the storage disk.
  • the servo head and the magnetic head 21 can advantageously be produced as thin-film structures in the same process, wherein the same magnetic materials can be used.
  • the magnetic head can be used to write to or read out the storage disk that passes beneath it.
  • the servo head 20 serves for an exact guidance of the missile 15 or its magnetic head 21 along a corresponding data track.
  • This head is a resistive reading device Executed head and contains two magnetic legs 22 and 23, which lead up to the lower edge 24 of the fluid body 15 or its runner 16.
  • a known agneto-resistive sensor 26 is arranged between the two magnetic legs 22 and 23.
  • FIG. 5 shows in an oblique view the positioning of the servo head 20 indicated in FIG. 4 over a storage disk 2 designed according to FIG. 3. Only the two ends 22a and 23a of its magnetic leg 22 facing the storage disk 2 are shown in FIG. 5 and 23 can be seen.
  • the Ideal ⁇ position of this servo head 20 and the associated read / write magnetic head is given when the servo head d just above the two guide tracks 9 un 'is 10 4c extending longitudinally to the data track and together the Form servo double track 12. Ie, the magnetic leg 22 is then located exactly above " the guide track 9 composed of the magnetization oppositely directed from the half-tracks 9a and 9b. Since these two half-tracks produce approximately equally strong, opposite magnetization relationships in the magnetic restaurant!
  • FIG. 6 An embodiment of a magnetoresistive sensor 26 for the servo head 20 according to FIG. 4 is illustrated in FIG. 6 in a top view. This sensor can advantageously be used in a
  • the sensor 26 is one
  • a corresponding element is characterized by a layer or surface 27 made of a magnetoresistive material such as a NiFe alloy.
  • the layer 27 generally consists of several thin films made of the magnetoresistive material in a sandwich-like manner, these films being separated in each case by thin insulation films, for example made of SiO 2 .
  • an electrically well-conducting material wi * e for example, of Au or Cu.
  • These conductor strips 28 are spaced apart from one another and are arranged at an angle ⁇ C of in particular 45 ° with respect to the easy axis of the magnetization M of the magnetoresistive material of the surface 27. A current I flowing perpendicularly between the conductor strips 28 is then forced to assume this angle with respect to the magnetization direction M.
  • the flow direction of this current I on side connecting conductors 30 and 31 and a central connecting conductor 32 is indicated by arrowed lines.
  • Typical dimensions of such an approximately 25 to 50 nm thick sensor are: total length L: approximately 100 to 200 ⁇ m; Width B: about 10 to 50 ⁇ m.
  • a servo head 20 with such a sensor 26 is guided over a servo double track 12 according to FIG. 2, 3 or 5, voltage connections 30 to 32 occur on its connecting conductors, which can be read from the characteristic curve of its sensor shown in FIG are (see also "NTG Technical Reports", Volume 76, 1980, pages 69 to 75).
  • This characteristic is in one 1 diagram " , the magnetic field H of a servo double track being entered on the abscissa and the signal or connecting voltage V occurring between the connecting conductors being entered on the ordinate.
  • the servo head is exactly in its
  • connection voltage V is at least largely linear over a relatively wide range of the H field.
  • Such a 10th characteristic curve can advantageously be used for exact tracking by means of electronics connected downstream of the sensor of the servo head.
  • the connecting conductors 30 to 32 of the sensor 26 can also be seen from the figure.
  • the center connection 32 can be guided away in an isolated manner via the sensor 26. A guide under or over one of the magnetic legs is also good
  • FIG. 9 shows a section which is laid across the servo head 20 along a section line marked IX-IX in FIG.
  • FIG. 9 shows the structure of the magnetic leg 22
  • the magnetic legs and the magnetoresistive sensor are made of a NiFe alloy
  • Figure 10 shows a longitudinal section through the magnetic leg 22 20 along a section line marked XX in Figure 8.
  • the laminated magnetic legs of the servo head can advantageously be designed with multiple steps, their thickness increasing from their leg end 38 facing the recording medium to the opposite 25 leg end 39 up to a total thickness D of approximately 5 ⁇ m ⁇ takes.
  • the gradation can advantageously be optimized together with the ratio of 1 to 1 2 (see FIG. 8) and the location dependence of the columns 36, 37 (see FIG. 9).
  • a write operation for magnetizing the guide tracks can be carried out, for example, in a single run with a known magnetic head which is rotated by 90 * and is formed on its own missile.
  • the shape of this missile can in particular be that of the one shown in FIG.
  • the two magnetic legs of this special track disc head should advantageously generate an approximately equally strong, oppositely directed magnetic field.
  • the thicknesses of the two magnetic legs of such a head essentially determine the respective transverse dimension q of the two half tracks of a guide track generated.
  • a ring head with correspondingly wide, adjacent magnetic legs for writing the half tracks can also be provided. It is particularly advantageous if the special head for writing the guide tracks is arranged on one flight runner of a particular missile corresponding to the head 21 and a servo head 20 according to FIG. 8 is provided on the other flight runner at the predetermined distance. Then you can already write with servo control when writing the guide tracks.
  • each guide track should have two half tracks, which, however, are magnetized longitudinally (horizontally) and directed in opposite directions to one another.
  • a servo head with a shape largely corresponding to the head 20 is then designed and guided such that its two magnetic legs are each assigned exactly one of the two half tracks in the ideal position.
  • Half tracks associated with magnetic legs lie in separate guide tracks, so that then as in the exemplary embodiments 1 according to Figures 2, 3 and 5, a servo double track is formed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

Un agencement d'enregistrement magnétique comprend un disque d'enregistrement magnétisable, une tête magnétique d'écriture/lecture agencée sur un corps flottant et un système de guidage des pistes. Le système comprend une servo-tête rigidement reliée à la tête magnétique et maintenue au moyen d'éléments électroniques connectés en aval sur au moins une piste de guidage. L'agencement d'enregistrement est conçu de façon à assurer un guidage continu de latête magnétique. A cet effet, des pistes de guidage (9, 10) séparément inscrites sur le disque d'enregistrement (2), le long des pistes de données (4c0, contiennent chacune deux demi-pistes parallèles (9a, 9b; 10a, 10b) qui présentent des sens de magnétisation antiparallèles (13a, 13b). Le corps flottant porte sur son côté plat postérieur la servo-tête (20) qui contient un capteur magnéto-résistif (26) magnétiquement couplé à deux branches d'aimant (22, 23) reliées à au moins une piste de guidage (9, 10).
PCT/EP1988/000142 1987-08-17 1988-02-26 Agencement d'enregistrement magnetique a systeme d'alignement des pistes Ceased WO1989001685A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3727433.3 1987-08-17
DE3727433 1987-08-17

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WO1989001685A1 true WO1989001685A1 (fr) 1989-02-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701248A1 (fr) * 1994-09-09 1996-03-13 Hitachi, Ltd. Appareil à disque magnétique
SG114554A1 (en) * 2001-06-15 2005-09-28 Fuji Photo Film Co Ltd Magnetic recording medium and drive apparatus therefor
EP1220204A3 (fr) * 2000-12-22 2007-04-04 FUJIFILM Corporation Milieu d'enregistrement d'information, méthode d'enregistrement et de reproduction d'information et méthode de fabrication de milieu d'enregistrement d'information

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308158A1 (fr) * 1975-04-14 1976-11-12 Philips Nv Dispositif d'exploration magnetique
JPS54155024A (en) * 1978-05-26 1979-12-06 Sony Corp Magnetic head
DE3330077A1 (de) * 1983-08-19 1985-02-28 Siemens AG, 1000 Berlin und 8000 München Einrichtung zum herauslesen von informationen, die nach dem prinzip der senkrechten magnetisierung in einem aufzeichnungsmedium eingespeichert sind
WO1986006864A1 (fr) * 1985-05-03 1986-11-20 Eastman Kodak Company Centrage de piste sensible au flux
US4642709A (en) * 1985-10-16 1987-02-10 International Business Machines Corporation Twin track vertical magnetic recording servo control method
JPH06173225A (ja) * 1991-12-18 1994-06-21 Tokai Doro Shisetsu:Kk 道路案内標識塔

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308158A1 (fr) * 1975-04-14 1976-11-12 Philips Nv Dispositif d'exploration magnetique
JPS54155024A (en) * 1978-05-26 1979-12-06 Sony Corp Magnetic head
DE3330077A1 (de) * 1983-08-19 1985-02-28 Siemens AG, 1000 Berlin und 8000 München Einrichtung zum herauslesen von informationen, die nach dem prinzip der senkrechten magnetisierung in einem aufzeichnungsmedium eingespeichert sind
WO1986006864A1 (fr) * 1985-05-03 1986-11-20 Eastman Kodak Company Centrage de piste sensible au flux
US4642709A (en) * 1985-10-16 1987-02-10 International Business Machines Corporation Twin track vertical magnetic recording servo control method
JPH06173225A (ja) * 1991-12-18 1994-06-21 Tokai Doro Shisetsu:Kk 道路案内標識塔

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, Band 14, Nr. 7, Dezember 1971 (Armonk, N.Y., US) T.W.S. Stenning: "Interleaved multielement magnetic heads", Seite 2129 *
IBM Technical Disclosure Bulletin, Band 24, Nr. 10, Marz 1982 (Armonk, N.Y., US) S.K. Decker et al.: "Combined servo and data head on common slider", Seite 4914 *
Patent Abstracts of Japan, Band 10, Nr. 243 (P-489)(2299), 21. August 1986; & JP-A-6173225 (NIPPON TELEGR. & TELEPH. CORP.) 15. April 1986 *
Patent Abstracts of Japan, Band 4, Nr. 14 (146-E)(169), 31. January 1980; & JP-A-54155024 (SONY K.K.) 12. Juni 1979 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701248A1 (fr) * 1994-09-09 1996-03-13 Hitachi, Ltd. Appareil à disque magnétique
EP1220204A3 (fr) * 2000-12-22 2007-04-04 FUJIFILM Corporation Milieu d'enregistrement d'information, méthode d'enregistrement et de reproduction d'information et méthode de fabrication de milieu d'enregistrement d'information
SG114554A1 (en) * 2001-06-15 2005-09-28 Fuji Photo Film Co Ltd Magnetic recording medium and drive apparatus therefor
US7359133B2 (en) 2001-06-15 2008-04-15 Fujifilm Corporation Magnetic recording medium and drive apparatus therefor

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