WO1985002706A1 - Tete magnetique integree, en particulier pour des unites de stockage de donnees - Google Patents

Tete magnetique integree, en particulier pour des unites de stockage de donnees Download PDF

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Publication number
WO1985002706A1
WO1985002706A1 PCT/HU1984/000061 HU8400061W WO8502706A1 WO 1985002706 A1 WO1985002706 A1 WO 1985002706A1 HU 8400061 W HU8400061 W HU 8400061W WO 8502706 A1 WO8502706 A1 WO 8502706A1
Authority
WO
WIPO (PCT)
Prior art keywords
frontal
stripe
magnetic head
layer
magnetic
Prior art date
Application number
PCT/HU1984/000061
Other languages
English (en)
Inventor
Péter KÁRMÁN
László VASS
Gyula Zsom
Original Assignee
Karman Peter
Vass Laszlo
Gyula Zsom
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 Karman Peter, Vass Laszlo, Gyula Zsom filed Critical Karman Peter
Priority to KR1019850700164A priority Critical patent/KR850700174A/ko
Publication of WO1985002706A1 publication Critical patent/WO1985002706A1/fr

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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
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109—Details
    • G11B5/313—Disposition of layers

Definitions

  • the invention relates to an integrated magnetic head, particularly for use in data storage units, comprising a substrate with a frontal face arranged oppositely to the surface of a magnetic data carrier and with a holding surface arranged perpendicularly to the frontal face, a head unit with a ferromagnetic element made in form of a layer on the holding surface and two input/output terminals connected to the head unit.
  • the magnetic head according to the invention is aimed for use in data storage units of computer systems, however, in cooperation with convenient electronics it can be used in every digital equipment based on magnetic data carrier, as tape or disc.
  • the integrated magnetic heads used in the known devices based on digital principle comprise a ferromagnetic thin layer produced by a known convenient method, e.g. a vacuum technology method (metal vaporization, metal sputtering etc.) or other on a substrate of material selected according to the requirements.
  • a vacuum technology method metal vaporization, metal sputtering etc.
  • the most widely used are the silicon monocrystals, ceramics, e.g. on the basis of Al 2 O 3 , and glass.
  • the substrate is shaped rectangularly with a frontal face arranged oppositely to the surface of the magnetic data carrier as disc or tape and with a holding surface carrying the head unit.
  • the ferromagnetic thin layer of the head unit constitutes a magnetic circuit comprising an air gap arranged at the frontal face and a straight element with a one or more coil wire around in the rear part of the substrate.
  • the coil serves for generating a reading current during forwarding data from the carrier or for involving changes of magnetic flux in order to alter the state of the magnetic elements of the carrier surface.
  • the main disadvantage of these magnetic heads follows from the presence of the air gap which is unavoidable necessary for analogouos signal transmittance: the magnetic flux is divided by the air gap into two parts; the greater one is transmitted by the magnetic circuit to the coil and the remaining part, estimated mostly for about 40 % is dissipated in the air gap without any positive effect.
  • the invention is aimed for avoiding the above mentioned disadvantages.
  • the invention is based on the perception that the use of a construction elaborated for processing analogue signals and comprising a coil for inducating a voltage or a magnetic flux is not necessary in the digital data processing technics, because the principle of digital processing renders the use of very simple solutions for storing and reading information possible.
  • the basis of the invention is the physical law of induction: a voltage is induced by a magnetic field generated by moved magnetic elements or the field thereof can be influenced by a voltage generating a magnetic field.
  • the object of the invention is therefore to elaborate a magnetic head in integrated form for making use of the above perception which can be performed by a simple technology, characterized by a low place requirement and is fully capable of carrying out the operations necessary when storing or reading information.
  • the object of the invention is an integrated magnetic head comprising a substrate with a frontal face arranged oppositely to a magnetic data carrier and with a holding surface arranged perpendicularly to the frontal face, a had unit made in form of a layer with ferromagnetic element on the holding surface and two input/output terminals, wherein according to the invention the head unit includes a frontal stripe, i.e.
  • the frontal stripe constitutes a conductor without air gap.
  • the length of the frontal stripe is generally very great in comparison to its thickness, this follows from the working conditions.
  • the frontal stripe can be connected to the input/output terminals by means of a two-branch rear part, whereby the conditions of connecting the magnetic head to outer units can be improved.
  • the frontal stdpe is arranged with one of its longitudinal edge exactly in the plane of the frontal face, it is a flat straight conductor characterized by thickness in range 0,1 to 1 ⁇ m and width in range 1 to 50 ⁇ m.
  • the frontal stripe can be made of a ferromagnetic material being a relatively good conductor, e.g. nickel, and of another ferromagnetic material with lower conductivity as iron, as well.
  • the ferromagnetic frontal stripe can be covered by a layer of metal of high conductivity, as aluminium, silver, copper or gold. This covering layer is generally thinner than the frontal stripe. This embodiment is very simple in the production.
  • Another very advantageous embodiment of the invented integrated magnetic head comprises a lower layer implemented into the substrate and an upper layer with the frontal stripe arranged therebetween, both layers being made of a ferromagnetic material wherein the frontal stripe consists of a metal of high electric conductivity.
  • This is a sandwich-type structure with an preferably non-ferromagnetic middle part, wherein the materials can be advantageously selected according to the requirements of the given construction and destination.
  • the upper and the lower layers should be made with a thickness at least five times greater than that of the frontal stripe and the upper and the lower layers extend pe rpendicularly to the frontal face for a distance advantageously at least ten times greater than the thickness of the frontal stripe, whereby the way of the magnetic flux can be closed yet easier than in the previous embodiments with upper and lawer layers.
  • the upper and lower layers can be produced by the means of usual vacuum technology methods, however, they can be consisted of amorphous metal, too. They can be separated from the frontal stripe by an insulating layer, if desired.
  • the preferred electric conductivity of the fronta stripe is at least sometimes, with a magnitude higher than that of the ferromagnetic materials used around.
  • the upper and lower layer are advantageously at least as wide as the frontal stripe.
  • the main advantages of the proposed magnetic head are the low place requirement, the high effectivity of power transformation and the high sensibility.
  • the magnetic head with a ferromagnetic frontal stripe can be manufactured very easily, the head with sandwich-type structure can be designed on an optimal way according to the given conditions.
  • Fig. 1 shows in axonometric view one of the preferred embodiments of the invented integrated magnetic head
  • Fig. 2 shows in axonometric view another preferre embodiment of the proposed integrated magnetic head
  • Fig. 3 is the side view of a aeries of magnetic heads shown in Fig. 1, and
  • Fig. 4 is the side view of a series of magnetic heads built-up according to Fig. 2. Description of the preferred embodiments The proposed magnetic head as integrated unit
  • Figs 1 and 2 comprises a substrate 15 holding a head unit 10 with a ferromagnetic element.
  • the substrate 15 of a unique magnetic head as an independent unit is generally a rectangular shaped body (e.g. cube)made e.g. of silicon monocrystal, ceramics based particularly on alumina, or glass. These materials can be characterized with electric insulating features and high abrasive resistance.
  • the substrate 15 is a body with a frontal face 14 facing the magnetic data carrier medium as disc or tape lying parallel to the plane thereof and with a holding surface arranged perpendicularly to the frontal face 14 and the data carrier as well.
  • the head unit 10 is arranged on the holding surface 13 and can be manufactured as usual by means of vacuum technology methods (metal vaporization, sputtering etc.), or like, i.e. by means of methods used in the technology of manufacturing thin layers for electronical equipment.
  • the head unit 10 comprises a frontal stripe 11 which constitutes a continuous straight conductor without air gap.
  • the frontal stripe 11 is arranged at the frontal face 14, generally reaching it with one edge, and advantageously forming a prolongation thereof.
  • the frontal stripe 11 is generally a flat element being thin in comparison to the width. Of course, it can be shaped otherwise, too. Experience shows, however, the most convenient is the flat and thin stripe with thickness in the range 0,1 to 1 ⁇ m and width 1 to 50 ⁇ m. This means, preferably the frontal stripe 11 prolongates the frontal face 14 with a generally straight part of 0,1 to
  • the frontal stripe 11 as mentioned is made continuous, there is no air gap therein. This practically straight conductor remains during work under the influence or is the source of a timely changing magnetic field whereby information can be transmitted to or form the data carrier.
  • the use of the proposed magnetic head can be facilitated by inserting a two-branch rear part 12 connected to the frontal stripe 11, whereby the input/output terminals 1 and 2 can be arranged in a place which is more convenient under given equipment conditions.
  • the two-branch rear part 12 can be made of material different from that of the frontal stripe 11, if desired, and the only requirement is the relatively high electric conductivity.
  • the substrates of these magnetic heads constitute a continuous body, wherefrom the frontal stripes 11 and the connected parts project only (Figs 3 and 4).
  • the frontal stripes 11 are arranged in a common plane, along a common straight line.
  • the integrated magnetic head proposed by the invention can be made in form of many advantageous embodiments, wherefrom two basic embodiments seem to be especially preferable.
  • the frontal stripe 11 is a ferromagnetic medium consisting of one of the known ferromagnetic metals or their alloy.
  • the frontal stripe is an advantageously 0,1 to 1 ⁇ m thick and 1 to 50 ⁇ m wide element which can be connected, as mentioned, to a two-branch rear part 12 made of the same metallic material or another material of high electric conductivity.
  • the two-branch rear part 12 forms rather an electric conductor than a closing element for a magnetic circuit.
  • the frontal stripe 11 can be consisted of nickel which is of relatively high electric conductivity (in comparison to other ferromagnetic metals of the iron group and their alloys) or iron, chromium alloyed iron etc.
  • a covering layer 16 can be arranged which is made of a metal of high conductivity, whereby the inner resistance of the head unit 10 is lowered.
  • the metal of high conductivity means in general the aluminium, silver, gold or copper.
  • the thickness of the covering layer 16 amounts up tu 0,3 ⁇ m, and it is generally less than the thickness of the frontal stripe 11.
  • the main advantage of the use of the covering layer 16 is that the inner resistance 100 ohm of the frontal stripe 11 made of nickel can be lowered by means of an aluminium c ⁇ ering layer 16 of 0,2 to 0,3 y» ⁇ thickness up to 50 ohm. This results in an improvement of the signal/noise ratio up to 40 %.
  • the aluminium covering layer 16 is especially advantageous to nickel frontal stripe 11.
  • the substrate 15 consists of, as mentioned, silicon monocrystal or otiier convenient material. The silicon is especially preferred when nickel as ferromagnetic material is used.
  • the optimal choice of the materials used for the substrate 15 and the frontal stripe 11 is a known technological problem wherein the thermal conditions should be taken into account: during registration the dissipated energy of the voltage pulses results in increasing temperature of the frontal stripe 11 and the heat is adiabatically transmitted to the substrate 15.
  • the interconnection between these two elements should be realised by a technology which, of course, after carrying out the preparatory steps required by it, gives in effect a connection of high life duration.
  • the vacuum technology methods are capable of realising connections on the basis of physical adhesive forces wherein the higher but not too high temperature can improve the quality, under the condition that the metal surfaces have been prepared accordingly, they contain only a very small amount of impurities.
  • the second of the mentioned two embodiments is optimal under the aspect of material choice wherein it is possible to select the materials according to the destination.
  • this embodiment (Figs 2 and 4) there are two ferromagnetic parts, namely a lower layer 24 and an upper layer 25 with the frontal stripe 11 therebetween made of metal of high electric conductivity, e.g. of aluminium or copper.
  • metal of high electric conductivity e.g. of aluminium or copper.
  • the frontal stripe 11 is as usual a flat metallic element with preferred thickness 0,1 to 1 ⁇ m and width 1 to 50 ⁇ m.
  • the width of the upper and lower layers 24 and 25 may depend on the width of the frontal stripe 11 because it is preferred to select these layers with a width at least equal to that of the frontal stripe 11 which is advantageously covered from both side by the layers mentioned.
  • the width of the upper and lower layers 24 and 25 amount generally from 10 to 500 ⁇ m.
  • the condition is fulfilled that their length and width be at least ten times greater than the distance (the width of the gap) between them.
  • This condition follows from the theoretical investigations and ensures minimal losses of the magnetic flux between the ferromagnetic elements facing one another. (In the known anangement the flux in this direction should be minimalised and not the losses thereof.)
  • the thickness of the upper and the lower layers 24 and 25 amount 1 to 5 ⁇ m, they can be made also of amorphous metal, permalloy, ferrite, chromium alloyed iron, nickel etc.
  • the input/output terminals 1 and 2 can be arranged in this case at the end points of the frontal stripe 11, however, it is more advantageous to arrange a two-branch rear part 12 as shown in Fig. 2.
  • the influence of the heat effects should be taken into account according to the general practice.
  • the lower layer 24 can be common for a higher number or all of the magnetic heads.
  • the lower layer 24 ia a metal band consisting e.g. of amorphous metal.
  • a common layer of this type causes no electric problems during work (e.g. the crasstalk level shows no increase in comparison to heads with separated lower layers 24).
  • the described structures of the proposed magnetic head can be realised with other dimensions, too.
  • the problem of design can not be treated in this application and they should be solved in the practice according to the destination of the magnetic head.
  • the electromagnetic materials it should be noticed that, as it is well-known, the materials of higher coercivity require pulses of higher level for registrating and during reading provide signals of higher level what makes the data processing more confident. These materials have a higher limit frequency and thereby render higher density of registrating possible.
  • the higher puls levels provide to higher power losses and result in higher temperatures of the materials used.
  • the materials of lower coercitivity cause a less number of problems in use, work, however, the higher sensibility against noises makes the designer construct more sophisticated electronic structures in order to avoid undesirable false registration or reading.
  • the integrated magnetic head according to the invention operates as follows.
  • the magnetic data carrier is forwarded in the direction of the array (Figs 1 and 2) in parallel to the frontal face 14.
  • the ferromagnetic parts of the magnetic data carrier generate a moving magnetic field.
  • a magnetic flux being closed in the material of and around the frontal stripe 11.
  • a voltage is induced which is conducted away by the frontal stripe 11, and this provides an altering electric level in the input/output terminals 1 and 2.
  • the opposite process takes place when the voltage pulses forwarded to the frontal stripe 11 make the magnetic head unit 10 generate a changing magnetic field causing the necessary changes in the ferromagnetic material of the magnetic data carrier forwarded before the frontal face 14.
  • the magnetic head according to the invention transform the main disadvantage of the known solutions into the advantage of generating or detecting changes with low power consumption because the magnetic flux is exploited fully, practically without losses.
  • the integrated magnetic head according to the invention is generally an element of a longer series of similar magnetic heads arranged at one another.
  • the crosstalk level is minimal and the materials can be selected in an optimal way under convenient conditions of manufacturing.

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  • Magnetic Heads (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)

Abstract

Tête magnétique intégrée pouvant être utilisée dans des unités de stockage de données ou d'autres dispositifs numériques coopérant avec des milieux de support magnétique des données, par exemple des bandes ou des disques. La tête magnétique comporte un substrat (15) avec une surface d'attache (13) perpendiculaire au plan du support magnétique de données, une unité de tête (10) ayant la forme d'une couche sur la surface d'attache (13) et deux bornes terminales d'entrée et de sortie (1, 2) où l'unité de tête (10) comporte une bande frontale (11) disposée le long de la face frontale (14) et connectée électriquement aux deux bornes terminales d'entrée et de sortie (1, 2). Cette tête magnétique intégrée garantit une conversion efficace élevée de l'énergie magnétique et électrique respectivement en énergie électrique et magnétique sans souffrir des désavantages provenant de l'utilisation des entrefers dans les solutions connues.
PCT/HU1984/000061 1983-12-13 1984-12-13 Tete magnetique integree, en particulier pour des unites de stockage de donnees WO1985002706A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019850700164A KR850700174A (ko) 1983-12-13 1984-12-13 데이라 처리용 집적자기헤드

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU4239/83 1983-12-13
HU834239A HU190640B (en) 1983-12-13 1983-12-13 Integrated magnetic head, preferably for computer technology purposes

Publications (1)

Publication Number Publication Date
WO1985002706A1 true WO1985002706A1 (fr) 1985-06-20

Family

ID=10967412

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU1984/000061 WO1985002706A1 (fr) 1983-12-13 1984-12-13 Tete magnetique integree, en particulier pour des unites de stockage de donnees

Country Status (5)

Country Link
EP (1) EP0164390A1 (fr)
JP (1) JPS61500817A (fr)
KR (1) KR850700174A (fr)
HU (1) HU190640B (fr)
WO (1) WO1985002706A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014991A1 (fr) * 1993-11-23 1995-06-01 Seagate Technology, Inc. Tetes magnetiques a couche mince comportant des sous-couches minces en nickel
US5666250A (en) * 1993-11-23 1997-09-09 Seagate Technology, Inc. Thin film magnetic heads with thin nickel underlayers
US6125010A (en) * 1993-11-23 2000-09-26 Seagate Technology Llc Mo-Au gold seedlayer in thin film heads

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2558914A1 (de) * 1975-02-10 1976-08-19 Ibm Magnetkopf mit einem abgeschirmten magnetoresistiven wandlerelement
DE2432259B2 (de) * 1973-09-20 1977-06-02 International Business Machines Corp., Armonk, N.Y. (V.StA.) Abgeschirmter, magnetoresistiver magnetkopf
DE3230416A1 (de) * 1981-08-17 1983-02-24 Sony Corp., Tokyo Magnetkopf mit einem magnetoresistenz-wandlerelement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2432259B2 (de) * 1973-09-20 1977-06-02 International Business Machines Corp., Armonk, N.Y. (V.StA.) Abgeschirmter, magnetoresistiver magnetkopf
DE2558914A1 (de) * 1975-02-10 1976-08-19 Ibm Magnetkopf mit einem abgeschirmten magnetoresistiven wandlerelement
DE3230416A1 (de) * 1981-08-17 1983-02-24 Sony Corp., Tokyo Magnetkopf mit einem magnetoresistenz-wandlerelement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014991A1 (fr) * 1993-11-23 1995-06-01 Seagate Technology, Inc. Tetes magnetiques a couche mince comportant des sous-couches minces en nickel
US5666250A (en) * 1993-11-23 1997-09-09 Seagate Technology, Inc. Thin film magnetic heads with thin nickel underlayers
US6125010A (en) * 1993-11-23 2000-09-26 Seagate Technology Llc Mo-Au gold seedlayer in thin film heads

Also Published As

Publication number Publication date
EP0164390A1 (fr) 1985-12-18
HUT36947A (en) 1985-10-28
JPS61500817A (ja) 1986-04-24
HU190640B (en) 1986-09-29
KR850700174A (ko) 1985-10-25

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