JPS62165717A - Thin magnetic head - Google Patents
Thin magnetic headInfo
- Publication number
- JPS62165717A JPS62165717A JP678186A JP678186A JPS62165717A JP S62165717 A JPS62165717 A JP S62165717A JP 678186 A JP678186 A JP 678186A JP 678186 A JP678186 A JP 678186A JP S62165717 A JPS62165717 A JP S62165717A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic pole
- magnetic poles
- track
- poles
- 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.)
- Pending
Links
- 239000010409 thin film Substances 0.000 claims abstract description 16
- 230000005415 magnetization Effects 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 239000010408 film Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract 3
- 238000009413 insulation Methods 0.000 abstract 1
- 101000606504 Drosophila melanogaster Tyrosine-protein kinase-like otk Proteins 0.000 description 18
- 229910020641 Co Zr Inorganic materials 0.000 description 1
- 229910020520 Co—Zr Inorganic materials 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/245—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track
- G11B5/2452—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track where the dimensions of the effective gap are controlled
-
- 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
- G11B5/3143—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
- G11B5/3146—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers
- G11B5/3153—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers including at least one magnetic thin film coupled by interfacing to the basic magnetic thin film structure
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高密度記録用の薄膜磁気ヘッドに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a thin film magnetic head for high density recording.
磁気ディスク装置等の磁気記録装置においては、記録密
度の向上にはビット密度（記録トラック単位長さ当りの
ビット数）とトラック密度（記録トラック単位幅当りの
トラック数）との双方の向上が必要である。このうち、
ビット密度に関しては、メッキまたは真空中のスパッタ
リング等の薄膜形成技術を使用した薄膜磁気ヘッドが実
用化されており、ビット密度向上に寄与している。In magnetic recording devices such as magnetic disk drives, improving recording density requires improvements in both bit density (number of bits per unit length of recording track) and track density (number of tracks per unit width of recording track). It is. this house,
Regarding bit density, thin film magnetic heads using thin film forming techniques such as plating or sputtering in a vacuum have been put into practical use, contributing to an increase in bit density.
一方、トラック密度の向上に関し、上記従来の薄膜磁気
ヘッドにおいてはその磁極の幅（トラッ幅）を狭小化す
る以外に有効な手段はなかった。On the other hand, in the conventional thin film magnetic head described above, there is no effective means for improving the track density other than narrowing the width of the magnetic pole (track width).
トラック密度は磁気ヘッドを所定のトラック上に位置決
めする際に発生する位置決め誤差からも制限を受ける。Track density is also limited by positioning errors that occur when positioning the magnetic head on a predetermined track.
トラック位置決め誤差（以下オフトラックと称する）に
起因する記録再生系のＳ／Ｎ比悪化のメカニズムは以下
の２つに大別できる。The mechanism of deterioration of the S/N ratio in the recording/reproducing system due to track positioning error (hereinafter referred to as off-track) can be roughly divided into the following two types.
まず第１はオフトラックにより磁気ヘッドが隣接トラッ
クに接近するため、隣接トラックの信号をクコストーク
ノイズとして拾い易くなることによるオフトラッククロ
ストーク特性によるものである。第２は不要になった開
信号上に新信号を重ね書きする際にオフトラックを生じ
たため消え残った明信号がノイズとして作用するオフト
ラックオーバーライト特性によるものである。これらオ
フトラッククロストーク特性とオフトラックオーバーラ
イド特性は磁気ヘッドのトラック幅に対し相反的な性質
を有する。すなわち、トラック幅が増加すればオフトラ
ックオーバーライド特性は向上するがオフトラッククロ
ストーク特性は悪化し、逆にトラック幅が減少すればオ
フトラッククロストーク特性は向上するがオフトラック
オーバーライド特性は悪化する。The first is due to the off-track crosstalk characteristic, which is caused by the fact that the magnetic head approaches the adjacent track due to off-track, which makes it easier to pick up signals from the adjacent track as crosstalk noise. The second reason is due to the off-track overwrite characteristic in which an off-track occurs when a new signal is overwritten on an open signal that is no longer needed, and the remaining bright signal acts as noise. These off-track crosstalk characteristics and off-track override characteristics have contradictory properties with respect to the track width of the magnetic head. That is, as the track width increases, the off-track override characteristic improves, but the off-track crosstalk characteristic deteriorates, and conversely, as the track width decreases, the off-track crosstalk characteristic improves, but the off-track override characteristic deteriorates.
この傾向はトラック密度の増加と共に顕著になり、１０
０ＯＴＰＩ（＝Ｔｒａｃｋｓ Ｐｅｒ Ｉｎｃｈ）以上
のトラック密度においては、前述の従来型薄膜ヘッドの
ように単にトラック幅をコントロールするだけでは両方
の特性を同時に満足するトラック幅を得ることは不可能
であった。This tendency becomes more pronounced as the track density increases, and 10
At a track density of 0OTPI (=Tracks Per Inch) or more, it is impossible to obtain a track width that satisfies both characteristics at the same time by simply controlling the track width as in the conventional thin film head described above.
本発明の目的は高トラツク密度においてオフトラックク
ロストーク特性とオフトラックオーバーライド特性との
双方を同時に満足し得る薄膜磁気ヘッドを提供すること
にある。An object of the present invention is to provide a thin film magnetic head that can simultaneously satisfy both off-track crosstalk characteristics and off-track override characteristics at high track densities.
本発明の薄膜磁気ヘッドは、基板上にギャップを形成す
る非磁性層とコイルを形成する導体層とを挟んで、軟磁
性膜からなる上部および下部磁極を配置した薄膜磁気ヘ
ッドにおいて、前記上部および下部磁極のどちらか一方
または両方に透磁率が低くかつ飽和磁化の大きな両端部
磁性層を並設したことを特徴とするものである。The thin film magnetic head of the present invention has upper and lower magnetic poles made of soft magnetic films sandwiched between a nonmagnetic layer forming a gap and a conductor layer forming a coil on a substrate. It is characterized in that both end magnetic layers having low magnetic permeability and high saturation magnetization are arranged in parallel on one or both of the lower magnetic poles.
以下、本発明について図面を参照して説明する。 Hereinafter, the present invention will be explained with reference to the drawings.
第１図は本発明の薄膜磁気ヘッドの実施例を示す正面図
、第２図は第１図の薄膜磁気ヘッドの磁極部分を記録媒
体（図示せず）対向面側より見た平面図である。第１図
および第２図において本発明の薄膜磁気ヘッドの実施例
は基板１１上に形成された下部磁極２０および上部磁極
３０と、上記２つの磁極２０および３０の間に絶縁層４
０を介して形成されたコイル層５０と、前記２つの磁極
２０および３０の記録媒体（図示せず）対向面側の端部
に形成された微小間隙すなわち記録再生ギャップ４５と
から構成される。本発明の特徴は前記下部磁極２０を中
央部の下部主磁極２１とその両側の下部補助磁極２２お
よび２３とから構成し、また前記上部磁極３ｏを中央部
の上部主磁極３１とその両側の上部補助磁極３２および
３３とから構成したことにある。さらに前記下部主磁極
２１および上部主磁極３１には高透磁率、高飽和磁化の
材質を用い、また下部補助磁極２２および２３と上部補
助磁極３２および３３には飽和磁化は高いが透磁率の小
さい材質を用いている。本実施例では下部主磁極２１お
よび上部主磁極３１には比透磁率３．０００ 、飽和磁
化０．８５Ｔ（テスラ）のＮｉ−Ｆｅを、また下部補助
磁極２２および２３と上部補助磁極３２および３３には
比透磁率１，０００ 、飽和磁化１．３ＴのＣｏ−Ｚｒ
−Ｎｂを用いた。FIG. 1 is a front view showing an embodiment of the thin film magnetic head of the present invention, and FIG. 2 is a plan view of the magnetic pole portion of the thin film magnetic head shown in FIG. 1, viewed from the side facing a recording medium (not shown). . 1 and 2, the embodiment of the thin film magnetic head of the present invention has a lower magnetic pole 20 and an upper magnetic pole 30 formed on a substrate 11, and an insulating layer 4 between the two magnetic poles 20 and 30.
The recording/reproduction gap 45 is formed at the end of the two magnetic poles 20 and 30 on the side facing the recording medium (not shown). The feature of the present invention is that the lower magnetic pole 20 is composed of a lower main magnetic pole 21 in the center and lower auxiliary magnetic poles 22 and 23 on both sides thereof, and the upper magnetic pole 3o is composed of an upper main magnetic pole 31 in the center and upper magnetic poles on both sides thereof. This is because it is composed of auxiliary magnetic poles 32 and 33. Further, the lower main magnetic pole 21 and the upper main magnetic pole 31 are made of materials with high magnetic permeability and high saturation magnetization, and the lower auxiliary magnetic poles 22 and 23 and the upper auxiliary magnetic poles 32 and 33 have high saturation magnetization but low magnetic permeability. Materials used. In this embodiment, the lower main magnetic pole 21 and the upper main magnetic pole 31 are made of Ni-Fe with a relative magnetic permeability of 3.000 and a saturation magnetization of 0.85 T (Tesla). Co-Zr with a relative permeability of 1,000 and a saturation magnetization of 1.3T.
-Nb was used.
本発明の薄膜ヘッドの動作は書込み時の磁界強度が読出
し時の約３倍以上強いことを利用したものである。すな
わち、書込み時の磁界強度は前述のように強いため、書
込み時には下部および上部の両生磁極２１および３１の
他に下記および上部の補助磁極２２，２３．３２および
３３の全てが作用する。このため、記録媒体上には下部
磁極２０および上部磁極が記録再生ギヤツブ４５を形成
している部分の幅りの信号が書き込まれる。これに対し
、読み出し時の磁界は小さいため、読出し時に作用する
のは下部主磁極２１および上部主磁極３１のみとなり、
したがって続出される信号の幅はｗ、ｌとなる。以上述
べた動作内容はいわゆるワイドライトーナロウリード（
Ｗｉｄｅ ｗｒｉｔｅ−ｎａｒｒｏｗ ｒｅａｄ）とし
て知られ、オフトラックが生じた場合でもオフトラック
クロストーク特性とオフトランクオーバーライド特性の
双方を満足させられることが既に判明している。The operation of the thin film head of the present invention takes advantage of the fact that the magnetic field strength during writing is approximately three times stronger than during reading. That is, since the magnetic field strength during writing is strong as described above, in addition to the lower and upper amphibodi magnetic poles 21 and 31, the following and upper auxiliary magnetic poles 22, 23, 32 and 33 all act. Therefore, a signal having the width of the portion where the lower magnetic pole 20 and the upper magnetic pole form the recording/reproducing gear 45 is written on the recording medium. On the other hand, since the magnetic field during reading is small, only the lower main magnetic pole 21 and the upper main magnetic pole 31 act during reading.
Therefore, the widths of the successively output signals are w and l. The operation described above is the so-called wide light narrow read (
It has already been found that even if off-track occurs, both off-track crosstalk characteristics and off-trunk override characteristics can be satisfied.
なお本実施例では下部および上部磁極の両方に透磁率が
低く飽和磁化の大きな補助磁極を設けた場合について述
べたが、下部または上部磁極のどちらか一方のみに本発
明を適用した場合にも効果はある。Although this example describes the case where auxiliary magnetic poles with low magnetic permeability and large saturation magnetization are provided on both the lower and upper magnetic poles, the present invention is also effective when applied only to either the lower or upper magnetic poles. There is.
以上説明したように本発明はギャップを形成する非磁性
層とコイルを形成する導体層とを挟んで、軟磁性膜から
なる上部および下部磁極を配置した薄膜磁気ヘッドにお
いて、上部および下１部磁極のどちらか一方または両方
に透磁率が低くかつ飽和磁化の大きな両端部磁性層を並
設したことにより、オフトラックが生じた場合でもオフ
トラッククロストーク特性とオフトラックオーバーライ
ド特性の双方を同時に満足することができ、トランク密
度の向上に効果がある。As explained above, the present invention provides a thin film magnetic head in which upper and lower magnetic poles made of a soft magnetic film are arranged with a nonmagnetic layer forming a gap and a conductor layer forming a coil in between. By arranging both end magnetic layers with low magnetic permeability and high saturation magnetization in parallel on one or both of the two, even if off-track occurs, both off-track crosstalk characteristics and off-track override characteristics can be satisfied at the same time. This is effective in improving trunk density.
第１図は本発明の薄膜磁気ヘッドの実施例を示す正面図
、第２図は第１図の磁極部分を記録媒体側から見た平面
図である。
１１・・・基板、２０・・・下部磁極、２１・・・下部
主磁極、２２および２３・・・下部補助磁極、３０・・
・上部磁極、３１・・・上部主磁極、３２および３３・
・・上部補助磁極、４０・・・絶縁層、４５・・・記録
再生ギャップ、５０・・・コイル層。
第１図FIG. 1 is a front view showing an embodiment of the thin film magnetic head of the present invention, and FIG. 2 is a plan view of the magnetic pole portion of FIG. 1 viewed from the recording medium side. DESCRIPTION OF SYMBOLS 11... Substrate, 20... Lower magnetic pole, 21... Lower main magnetic pole, 22 and 23... Lower auxiliary magnetic pole, 30...
・Top magnetic pole, 31...Top main magnetic pole, 32 and 33・
...Top auxiliary magnetic pole, 40... Insulating layer, 45... Recording/reproducing gap, 50... Coil layer. Figure 1
Claims (1)
を形成する導体層とを挟んで、軟磁性膜からなる上部お
よび下部磁極を配置した薄膜磁気ヘッドにおいて、前記
上部および下部磁極のどちらか一方または両方に透磁率
が低くかつ飽和磁化の大きな両端部磁性層を並設したこ
とを特徴とする薄膜磁気ヘッド。(1) In a thin film magnetic head in which upper and lower magnetic poles made of a soft magnetic film are arranged on a substrate with a nonmagnetic layer forming a gap and a conductor layer forming a coil in between, which of the upper and lower magnetic poles is arranged. A thin film magnetic head characterized in that magnetic layers at both ends having low magnetic permeability and high saturation magnetization are arranged in parallel on one or both of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP678186A JPS62165717A (en) | 1986-01-16 | 1986-01-16 | Thin magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP678186A JPS62165717A (en) | 1986-01-16 | 1986-01-16 | Thin magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62165717A true JPS62165717A (en) | 1987-07-22 |
Family
ID=11647712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP678186A Pending JPS62165717A (en) | 1986-01-16 | 1986-01-16 | Thin magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62165717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555482A (en) * | 1994-07-07 | 1996-09-10 | Maxtor Corporation | Etched erase band feature for thin film recording heads |
-
1986
- 1986-01-16 JP JP678186A patent/JPS62165717A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555482A (en) * | 1994-07-07 | 1996-09-10 | Maxtor Corporation | Etched erase band feature for thin film recording heads |
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