WO1990009658A1 - Thin-film magnetic head with two magnetic poles separated by a narrow gap for vertical recording - Google Patents

Thin-film magnetic head with two magnetic poles separated by a narrow gap for vertical recording Download PDF

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Publication number
WO1990009658A1
WO1990009658A1 PCT/EP1989/001331 EP8901331W WO9009658A1 WO 1990009658 A1 WO1990009658 A1 WO 1990009658A1 EP 8901331 W EP8901331 W EP 8901331W WO 9009658 A1 WO9009658 A1 WO 9009658A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
layer
pole
magnetic head
head according
Prior art date
Application number
PCT/EP1989/001331
Other languages
German (de)
French (fr)
Inventor
Heinrich Diepers
Original Assignee
Siemens Aktiengesellschaft
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
Priority to EP89102446 priority Critical
Priority to EP89102446.5 priority
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1990009658A1 publication Critical patent/WO1990009658A1/en

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/1278Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier

Abstract

The magnetic head (2) contains a conducting element (5) which conducts the magnetic flux and which has two magnetic arms (6, 7) that delimit a narrow gap (20). Each magnetic arm has a magnetic pole (P1, P2) at a pole tip (8, 9) and each has a magnetic reinforcing layer (6b, 7b) outside the region of the pole tips. According to the invention, one magnetic arm (6) is provided with an additional pole layer (15) adjacent to the gap (20), and made of a material whose saturation magnetization (Ms') and/or relative permability (ν') are/is greater than those of the material of the other parts of the magnetic conducting body (5).

Description

A thin film magnetic head with two through a narrow gap beabstan- Deten magnetic poles for vertical recording

The invention relates to a thin film magnetic head for vertical (vertical) recording with the magnetizations rule flow leading, applied to a non-magnetic substrate magnetic guide body having a ringkopfähn- Liche shape and contains two magnetic legs, each having at least one having magnetic layer and forming a magnetic pole at a a vertically to agnetisiereπden Aufzeichnungs¬ medium facing pole tip, - seen the magnetic poles thereof in (relative) direction of movement of the head after the other and are arranged by a gap with a low gap width separated from each other, the further spaced with respect to the gap width, a have gap bounding leg portions, through which the turns of a writing / Lesespulenwick- lung extend, and which are provided outside the region of their pole tips each provided with a magnetic reinforcing layer, it being possible for this reinforcing layers corresponding T parts of the outer sides αes magnetic conducting body form.

Designed in this way a thin film magnetic head is "apparent from the EP-B-0185289.

The principle of a perpendicular (vertikalten) magnetization for storing data in corresponding, in particular plate-shaped recording media is well known. designed for this Magπetisieruπgsarten thin film magnetic heads have to guide the magnetic flux in a general guide body from magπetisierbarem material, which may have a similar Ring¬ shape having two magnetic legs in particular a shape. This magnetic legs form at their pole tips facing the recording medium of magnetic poles which are seen with respect to the recording medium in a relative movement direction of the head located behind each other with a narrow gap is formed between the pole tips. Outside the range of the pole tips which limit Ma¬ gnetschenkel a gap, which is accordingly extended because of a entspre¬ Vergröße¬ tion of the mutual distance of the Magnetscheπkel. Through this gap, the conductors extend at least one read / write coil winding.

A corresponding structure is also known from the aforementioned EP-B magnetic head. Each of the magnetic legs of this magnetic head contains at least one of the time jewei¬ magnetic pole forming the magnetic layer outside the realm of the pole tips Be¬ nor a magnetic layer Verstärkungs¬. This serves to improve the flux guide or to the ER niedrigung the magnetic resistance in the magnetic guide body reinforcement layers are arranged so an¬ that essentially form the outer sides of the guide body magne¬ tables. This guide body is constructed on the back of a non-magnetic substrate in thin-film technology, wherein the substrate is ge staltet as missiles, so that it is away perform aerodynamically above the plate-shaped Aufzeichπungsmedium.

Especially of such thin-film magnetic heads for vertical magnetization are high recording densities of eg more than 50 kfci (kilo flux changes per inch) changed gefor¬. The magnetic heads must therefore write particularly sharp Ma¬ gnetisierungsübergänge and read fields with very narrow Kopf¬. The object of the vorliegenαen invention, it is now th auszugestal¬ the thin film magnetic head of the type mentioned at the outset that he te narrow write error with a steep expiring Kan¬ and may comparable in particular also to produce narrow reading fields, and thus a corresponding increase of the upper Schreib¬ enables frequency and high resolution reading.

This object is inventively achieved in that, viewed in the (relative) direction of movement leading Magnetscheπ- angle with a delimiting the gap on one side, zusätz¬ union pole layer is provided made of a material whose saturation magnetization and / or its relative Permeabili¬ ty each greater are / is provided as the saturation magnetization and relative permeability of the at least one material of the remaining parts of the magnetic guide body.

In the inventive magnetic head of the zoom out at the pole tips on the preceding magnetic limb magnetic flux is then concentrated to the space defined by the additional pole layer with its higher permeability Zusatzpol. The higher saturation magnetization of this additional pole causes this pole is saturated later than the immediately adjacent portions of the magnetic pole of the magnet leg anlie¬ constricting. This has the advantage in particular connected to the αaß reproduced in a diagram Magnet¬ field profile of the magnetic head of the invention or its provided with the Zusatzpol preceding magnetic limb verhält¬ ately is steep and narrow. This consideration applies to the case of writing as well as in the case of reading. Consequently, the inventive measures result in a narrower reading pulse. Vol connected thereto is also advantageous to reduce the so-called bit shift, that is, the spatial or temporal shift between a written and a read Ma¬ gnetisierungsübergang junction (comparative example before "IEEE Trans.Magn.". MAG-19, No .5, Sept. 1983, pp 1617-1619). The erfiπdungsgemäßen measures can be used to particular advantage for magnetic heads according to the vertical magnetization principle.

Advantageous embodiments of the magnetic head after ErAn- go fertil in the dependent claims.

The invention is described below with reference to the voltage Zeich¬ further explained. Here, FIG 1 shows diagrammatically. The drawing shows an embodiment of a magnetic head according to the invention. FIG. 2 a section of a entspre¬ sponding magnetic head is clear closer. In Fig. 3 a diagram showing a to be generated by this magnetic head Magnetfeld¬ is reproduced component. Figures 4 and 5 show further training opportunities of the magnetic head of FIG. 2. In the figures, corresponding parts are provided with the same reference numerals.

In the in Fig. 1 as a longitudinal section partially veranschau¬ clear thin film magnetic head for writing and reading are assumed known ring head related embodiments with layer by layer structure for the principle of a longitudinal (horizontal) or in particular a vertical (vertika¬ len) magnetization. The generally designated in the Figure 2 head is formed in thin-film technology on a substrate 3, which can be designed in a known manner as by Flugkör¬ and in the figure is not ausge¬ leads. As the substrate, a body 3a of TiC-A ^ O-, advantageously used. Since this material is electrically conductive due to the TiC component, the substrate 3 must be additionally still with an insulating layer 3b provided from, for example A1 2 0. 3 Instead of TiC particular AlN can be used as a substrate material. The substrate 3 and da¬ with the magnetic head 2 are known relative to a per se, the intended magnetization principle appropriate up recording medium in low altitude along a track aero¬ effort lead. This respect to the head of the relative Bewegunςsricr.tung SiCN oeispielsweise under this way wegαrehenüen recording medium is angeαeutet by a V bezeich¬ designated arrowed line.

3 magnetic head 2 has a leading the magnetic flux guide bodies 5 having two magnetic legs 6 and 7. FIG. This ma- gnetscnenkel each contain at least a magnetic layer 6a and 7a thereof facing the recording medium αen pole tips 8 and 9 each have a magnetic pole Pl and P2 training. Each magnet leg is outside the pointed by the Pol¬ 8 and 9 occupied areas with an additional CNEN, relatively thick magnetic layer 6b and 7b comparable -strengthens. These additional layers serve see guide body 5 advantageous for reducing the magnetic resistance in the magnetic and Schreibfel- also be used αes of the head and for a possible target Asy parameterization of the field configuration. The two Verstärkungsschich¬ th 6b and 7b are advantageously arranged so that they lie on αen outer sides of the magnetic guide body. Here, the reinforcing layer 6b which is associated with the hin¬ clearly the direction of movement v leading Magnetschen¬ kel, in a waππenartigen recess 11. This recess can advantageously layer 3b of the substrate 3 in the insulating Deck¬ so incorporated and 6b with the reinforcing layer so is be filled that the Ma¬ gnetschicht 6a facing surface 12 of the Verstärkungs¬ 6o layer together with the non-recessed surface 13 of the outer layer 3b is in a common plane e.

In a central region of the ring-head-like magnetizations rule guide body 5, the distance between the two magnetic legs 6 and 7 is extended by the terms of the direction of movement v rearward (trailing) Magnet¬ leg 7 w in this area at a greater distance relative to the front, just formed and the substrate i 3 facing the magnetic leg 6 carries. Outside this er¬ far Erten Leitkörperbereiches is added to the recording edium opposite side of the Leitkδrpers the magnetic leg 7 in a known manner to the magnet leg 6 on the so

5 that it is the ring-head-like shape of the guide body 5 is obtained. By between the two magnet legs 6 and 7 thus present in the extended Leitkörperbereich interspace 16 is at least one single or multi-layer coil winding 17, may be practiced with both the writing and the reading function 10 extends. If appropriate also be provided separate windings for this purpose. All of the magnetic guide body 5 is covered on its Außen¬ side with a hard, non-magnetic protective layer 18, for example, A1 2 0. 3

_ __-

The pole area of ​​the magnetic head 2 in FIG. 1 entsprechen¬ the head is illustrated in more detail in Fig. 2. As seen from FIG die¬ ser which the pole tip is to be provided 15 according to the invention nor a zu¬ additional pole layer,

20 amplifies one of the two magnetic legs and a Zusatzpol P'bildet. Advantageously, the side facing the substrate 3, vor¬ current magnetic leg 6 with this additional pole layer 15 is provided. The pole layer whose longitudiπale, ie movement direction in Be¬ v to be measured generally has a thickness d

25 ert between 0.2 μ and 1.5 microns has, rests against the said opposing magnetic leg 7 facing side of the magnet leg. 6 Its vertical dimension a is advantageously at least as large as the corresponding Ausdeh¬ voltage b of the part of the magnetic layer 6a, the pole tip 8

30 forms and is not strengthens ver¬ means of the reinforcing layer 6b. Between the Zusatzpol P 1 Pol¬ forming layer 15 and the pole P2 forming pole tip 9 of the Ma¬ gnetschenkels 7 then remains a gap 20 having a small adhesive vorteil¬ longitudinaleπ width g. This width g is in

35 generally range from a few tenths of a micrometer, vor¬ preferably in the range below 0.5 microns, eg, about 0.1 μ. The magnetic layers 6a, 6b, 7a and 7b of the magnetic body 5 Leit¬ advantageously consist of the same or if appropriate even from different known soft agneti- rule materials. Suitable materials for this are, for example, special alloys such as NiFe permalloy or CoZr or COHF. These materials have a predetermined Sättigungsmagne- tisieruπg Ms of example, at least 800 kA per meter and a relative permeability μ of at least 500. In contrast, a material whose saturation magnetization Ms 1 and / or its relative permeability should be selected according to the invention for the additional pole layer 15, μ 1 as in each case comparably greater / than the saturation magnetization Ms, or as the relative permeability μ. It is to be regarded as vorteil¬ way, when primarily the Sättigungsmagneti- tion Ms 1 is greater than Ms is chosen. Suitable materials for the pile layer 15 are, for example CoNb alloys with additions of Fe or Zr, or Mo, or Cr, or Ru. Also CoHf- or CoZr- or CoFe alloys may be used (EP-A-0192161 vgl.zB) with additions of Ta or Pt or Pd. In addition, also fulfill known alloys containing at least some of the components Fe, Si, Al, Ge and Ga at the same time, the demands regarding high Sättigungsmagπetisieruπg Ms 1 and high relative permeability μ '. In general, it will be excluded assumed that materials are particularly suitable when its saturated magnetization Ms at least 1 liter, 5 times the saturation magnetization is Ms. The relative Perme¬ ABILITY μ 1 need not necessarily corresponding extent or not at stability over the relative Permeabi¬ to be μ increases. Should duπg other hand, according to the inventions primarily an increased relative permeability μ 1 are provided, it is advantageous if: μ ^ 1 1.5 - μ. then with such a choice of material, the specific design αer magnetic layer 6a and its associated pole layer 15 may be configure so that no magnetic Sätti¬ supply in an outlined by a dashed line transition area A of the magnetic flux from the magnetic layer 6a on the pile 15 occurs with increasing increasing the current in a Spuleπwicklung 17 (Fig. see FIG. 1). Vorteil¬ way magnetic saturation should in fact only occur at the pole tips. This can be characterized ensure that one selects the vertical extent of a pole layer 15 of the same or greater than the corresponding extent of the non-ver¬ strengthened part of the magnetic layer 6a. The extent of this non-reinforced part is through the Entfer¬ voltage e of the tip facing the recording medium of the reinforcement layer 6b gnetpoles set from the plane of the pole face of the ma- Pl / P. 1

By this measure, namely by avoiding saturation vorzei¬ term in the transition area between the magnetic layer A and 6a de'r pole layer 15 is also achieved, that short-circuiting of the magnetic flux between the layers 6a and 7a Magnet¬ reduced. This Flußkurzschlüs¬ are indicated in Fig. 2 by line 21 a swept se. A reduction of such Flußkurzschlüsse is promoted also advantageous αaourch that the reinforcing layer is πet angeord- 6b cer outside of the magnetic guide body 5 and thus ver¬ proportionate far vcπ the magnetic layer 7a.

generally as in magnetic heads for the vertical magnetization, the effek¬ tive gap width is greater than the geometric width g of Spal¬ tes 20. The effective gap width is also in the inventive magnetic head that is substantially determined by the flux density, or by the position of the Maxi A of field strengths in the pole Pl / P 1 on the one hand and the pole P2 on the other hand as well as by the magnetic properties of the recording medium, in particular when using a magnetic weich¬ pad underlying the storage layer is determined. The effective gap width is advantageously carried fertil the training reduces the auxiliary pole P 1; ent This results in short pulse lengths speaking, so that large bit densities can be read with the magnetic head according to the invention. This applies in particular when being written into the recording medium Magnetisierungsübergäπge narrow with a steep profile, so that the head is determined with its effective gap width of the resolution.

In Fig. 3, the field ratios produced during writing of an inventive thin-film magnetic head which a known magnetic head are compared in a diagram. In this diagram, only the y components of the magnetic fields generated by the magnetic heads H in response to the V pointing in the direction of movement of the respective expansion x head are indicated. The Hy designated field strength curve (dashed line) results here for a magnetic head, as known from EP-B-0232505 (see FIG. Insbe¬ there sondere Fig. 2) can be seen. This known Magnet¬ head has no additional pile like a erfindungs¬ modern head. In contrast, the field strength curve Hy '(solid line) is at a erfinαungsge ate Umgestal¬ processing of the known magnetic head obtained. As with a comparatively the two curves Hy and Hy 'is clearly visible, the field strength curve shows Hy'des Magnet¬ head according to the invention advantageously have a steeper slope of its edge, which is assigned to the running (writing) edge of the head. An inventively designed magnetic head can therefore write entsprechenα sharper Magnetisieruπgsübergänge. In addition, since the field strength has curve Hy'ein very narrow maximum, when reading the data written Magnetisierungsüber- be gange according scanned in high resolution. game according to oe chosen for the Figures 1 to 3 embodiment example, it was assumed that the Ma¬ invention gnetkopf a preceding magnetic limb 6 with at least one magnetic layer 6a, whose facing in Aufzeichnungsme- dium end together with the corresponding end of the additional pole layer 15 has a forming magnetic pole Pl / P 1 with a lying in a common plane pole face. Optionally, however, the at least one magnetic layer of this magnetic leg with respect to the additional pole layer may be vertically shortened configured; ie, in the case die¬ sem no longer extends as far as the plane of the pole face of this leg, so that then only the additional pole layer 15 defines the pole face of the magnetic pole. A entsprechen¬ the embodiment, ER- clearly from the section of Figure 4, for which a figure 2 is selected corresponding representation. In this figure, the vertically shortened Ma¬ is gnetschicht with 6c respectively.

6c may These magnetic layer optionally including those which may be formed shortens that it coincides the recording medium zuge¬ end facing the end of the assigned magnetic reinforcement layer 6b. This special case is indicated in Fig. 5, it being understood from the embodiment of Fig. 4. As is apparent from this figure, can αann the shortened magnetic layer and the associated reinforcing layer are gebil¬ det by a common layer 6d. In this figure also illustrates that in a magnetic head according to the invention is generally the Pol¬ layer 15 does not need heranzureichen necessarily only to the end of a magnetically tables reinforcing layer but a little way into the 6 and 7 defined by the two magnetic legs extended gap may extend 16th

Claims

claims
1. A thin film magnetic head for vertical (perpendicular) Aufzeich¬ voltage with a magnetic flux leading, applied to a non-magnetic substrate magnetic
Guide member, having a ring shape similar head and contains two magnetic legs, each having at least a magnetic layer, and forming a magnetic pole at a vertical to a magnetizing Aufzeichnungsme- diu facing pole tip, - whose magnetic poles in (relative) direction of movement of
Head seen after the other and by a Spal, t with - small gap width are arranged separately from each other, the further spaced with respect to the gap width having a gap defining leg portions, through which the turns of a writing / Lesespulenwick- lung extend, and outside the range their Polspitzeπ are each provided with a magnetic reinforcing layer, it being possible for this reinforcing layers corresponding parts of the outer sides of the magnetic guide body form, characterized in that the in (relative) direction of movement (v) seen leading magnetic limb (6) with a gap (20 ) on one side bounding, auxiliary pole layer (15) made of a material whose saturation magnetization (Ms 1) and / or the relative permeability (μ 1) are each greater / than the saturation magnetization (Ms) and relative permeabilization - tat (μ) of at least one material of the remaining T parts of the magnetic guide body (5).
2. A magnetic head according to claim 1, dadurchge ¬ indicates that provided the substrate (3) conces- turned Magπetscheπkel (6) with the additional pole layer (15).
3. A magnetic head according to claim 1 or 2, since d. urchge ¬ indicates that the at least one Magnet¬ layer (6a) of the preceding magnetic limb (6) with the zu¬ sätzlichen pole layer (15) common to the magnetic pole (Pl / P 1) make this leg.
4. A magnetic head according to claim 1 or 2, dadurchge ¬ indicates that the at least one Magnet¬ layer (6c) of the preceding magnetic limb (6) relative to the additional pole layer (15) ausgebil¬ vertically foreshortened det, so that these pile (15) alone constitutes the magnetic pole (P 1) of this leg. (Fig. 4)
5. A magnetic head according to claim 4, dadurchge - indicates that the shortened magnetic layer and the associated reinforcing layer are formed by a gemein¬ same layer (6d). (Fig. 5)
6. A magnetic head according to any one of claims 1 to 5, since - by in that the vertika¬ le extent (a) of the additional pole layer (15) is at least as large as the distance (e) of the reinforcing layer (6b) from the pole face of the magnetic pole (Pl / P 'or P 1) of the associated magnetic limb (6).
7. A magnetic head according to any one of claims 1 to 6, since ¬ by in that the movement direction in Be¬ (v) to be measured thickness (d) is the additional pole layer (15) is between 0.2 microns and 1.5 microns.
8. A magnetic head according to any one of claims 1 to 7, as ¬ by in that the Sätti¬ supply magnetization (Ms 1) of the material of the additional pole layer (15) is at least l, 5 times the Sättigungsma- gnetisierung (Ms) of the material of the remaining parts of magne¬ tables guide body (5) is.
9. A magnetic head according to any one of claims 1 to 8, as ¬ by in that the supply Sätti¬ magnetization (Ms) of the remaining parts of the magnetic guide body (5) is at least 800 kA / m.
10. A magnetic head according to any one of claims 1 to 9, as ¬ by in that the relative permeability (μ 1) of the material of the additional pole layer (15) is at least l, 5 times the relative permeability (μ) of the material of the remaining parts of the magnetic guide body (5) is.
11. A magnetic head according to any one of claims 1 to 10, as ¬ by in that the rela- ve permeability (μ) of the material of the remaining parts of the ma¬-magnetic guide body (5) is at least the 500th
12. A magnetic head according to any one of claims 1 to 11, as by ¬ in that see vorge as Mate rial for the additional pole layer (15) has a CoNb- or CoHf- or CoZr- or a CoFe alloy.
13. A magnetic head according to any one of claims 1 to 12, since - by in that the magne¬ diagram reinforcement layer (6b) of the substrate (3) facing zuge¬ magnetic limb (6) in a corresponding Vertie¬ Fung (11) of the substrate (3 ) is arranged.
PCT/EP1989/001331 1989-02-13 1989-11-07 Thin-film magnetic head with two magnetic poles separated by a narrow gap for vertical recording WO1990009658A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP89102446 1989-02-13
EP89102446.5 1989-02-13

Publications (1)

Publication Number Publication Date
WO1990009658A1 true WO1990009658A1 (en) 1990-08-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6404601B1 (en) * 2000-01-25 2002-06-11 Read-Rite Corporation Merged write head with magnetically isolated poletip
US7639452B2 (en) * 2005-03-07 2009-12-29 Hitachi Global Storage Technologies Netherlands B.V. Magnetic head for perpendicular recording and fabrication process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0185289A1 (en) * 1984-12-21 1986-06-25 Siemens Aktiengesellschaft Thin-film magnetic head on a non-magnetic substrate for perpendicular magnetization
EP0232505A1 (en) * 1985-12-20 1987-08-19 Siemens Aktiengesellschaft Magnetic storage device with a recording medium to be magnetized perpendicularly
JPS62285211A (en) * 1986-06-04 1987-12-11 Olympus Optical Co Ltd Perpendicular magnetization type thin film head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0185289A1 (en) * 1984-12-21 1986-06-25 Siemens Aktiengesellschaft Thin-film magnetic head on a non-magnetic substrate for perpendicular magnetization
EP0232505A1 (en) * 1985-12-20 1987-08-19 Siemens Aktiengesellschaft Magnetic storage device with a recording medium to be magnetized perpendicularly
JPS62285211A (en) * 1986-06-04 1987-12-11 Olympus Optical Co Ltd Perpendicular magnetization type thin film head

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 175 (P-707) (3022), 25. Mai 1988; & JP-A-62285211 (Olympus Optical Co. Ltd) 11. Dezember 1987 *
Research Disclosure, Nr. 271, November 1986, (Emsworth, Hampshire, GB), "A Flexible-Disk", seite 688 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6404601B1 (en) * 2000-01-25 2002-06-11 Read-Rite Corporation Merged write head with magnetically isolated poletip
US7639452B2 (en) * 2005-03-07 2009-12-29 Hitachi Global Storage Technologies Netherlands B.V. Magnetic head for perpendicular recording and fabrication process

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