JPS63220409A - Magnetoresistance type head - Google Patents
Magnetoresistance type headInfo
- Publication number
- JPS63220409A JPS63220409A JP5251887A JP5251887A JPS63220409A JP S63220409 A JPS63220409 A JP S63220409A JP 5251887 A JP5251887 A JP 5251887A JP 5251887 A JP5251887 A JP 5251887A JP S63220409 A JPS63220409 A JP S63220409A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetoresistance
- magnetic flux
- signal
- magnetoresistive
- 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
- 230000005291 magnetic effect Effects 0.000 claims abstract description 78
- 230000004907 flux Effects 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 230000005294 ferromagnetic effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000002542 deteriorative effect Effects 0.000 abstract description 2
- 239000010409 thin film Substances 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 6
- 239000010408 film Substances 0.000 description 5
- 238000000206 photolithography Methods 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000012045 magnetic resonance elastography Methods 0.000 description 4
- 229910003271 Ni-Fe Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000005566 electron beam evaporation Methods 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007740 vapor 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
- G11B5/33—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
- G11B5/3916—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide
- G11B5/3919—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path
- G11B5/3922—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure
- G11B5/3925—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure the two parts being thin films
-
- 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
- G11B5/3967—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read
- G11B5/397—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read with a plurality of independent magnetoresistive active read-out elements for respectively transducing from selected components
- G11B5/3974—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read with a plurality of independent magnetoresistive active read-out elements for respectively transducing from selected components from the same information track, e.g. frequency bands
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は磁気記録媒体として、磁気テープ、磁気ディス
クを使用した磁気記録再生装置において、高記録密度化
に対応した薄膜型の磁気ヘッドに関し、特にアナログ信
号の再生を目的とした磁気抵抗型ヘッドに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a thin film magnetic head compatible with high recording density in a magnetic recording/reproducing device using a magnetic tape or a magnetic disk as a magnetic recording medium. This invention relates to a magnetoresistive head for the purpose of signal reproduction.
従来の技術
最近、磁気記録装置においてトラック密度の向上に伴う
トラック幅の短縮と磁気テープ走行速度の低速化などか
ら再生ヘッドとして、その出力が磁気テープの走行速度
に依存しない磁気抵抗型ヘッド（ＭＲＨ）が広く使用さ
れつつある。これは強磁性金属薄膜の磁気抵抗（ＭＲ）
効果を利用したものでヨークタイプＭＲヘッドとよばれ
るその代表的構造を第３図に示す。BACKGROUND OF THE INVENTION Recently, in magnetic recording devices, due to the shortening of the track width and the slowing of the running speed of the magnetic tape due to the increase in track density, magnetoresistive heads (MRH), whose output does not depend on the running speed of the magnetic tape, have been used as playback heads. ) is becoming widely used. This is the magnetoresistance (MR) of a ferromagnetic metal thin film.
FIG. 3 shows a typical structure of a yoke type MR head that takes advantage of this effect.
第３図において、強磁性基板４１上に５ｉＱ２あるいは
Ａｌ２Ｏ３など第１の絶縁層（図示せず）をスパッタな
どにより形成し、次いでその上に磁気抵抗素子（ＭＲＥ
）にバイアス磁界を印加するための第１の導体薄膜４２
が形成される。材料としてＣｒ下地のＡｕあるいはＡｌ
などを使用し、フォトリングラフィ技術によって所定の
形状にパターン化される。その後５１０２．Ａｌ２Ｏ３
などの第２の絶縁層（図示せず）が蒸着スパッタなどで
形成される。この第２の絶縁層上にＭＲＥ４３として、
Ｎｉ−Ｆｅ薄膜を電子ビーム蒸着スパッタなどでトラッ
ク幅方向が磁化容易軸となるように形成した後、フォト
リングラフィ技術によって微細パター磁化される。次に
ＭＲＥにセンス電流を流すための第２の導体薄膜４ｓａ
、４ｓｂが形成されパターン化される。これらの上に第
３の絶縁層（図示せず）が形成された後、磁気記録媒体
からの信号磁界をＭＲＥに導くための強磁性薄膜、例え
ばＮ ｉ −Ｆ ｅ薄膜あるいは、Ｆｅ−Ａｌ−３Ｌ薄
膜あるいはアモルファス軟磁性膜が形成され、フォトリ
ングラフィ技術によって前部ヨーク部４４ａ、後部ヨー
ク部４４ｂが構成される。この時、前部ヨーク部４４ａ
と後部ヨーク部４４ｂはＭＲＥ４３と一部オーバラツプ
しており磁気記録媒体から信号磁界がＭＲ’Ｈに導びか
れやすいように構成される。次いでＳｉｎ、５ｉ０２な
どのパッシベーション膜（図示せず）が形成され、その
後接着剤などによってガラス、セラミックス等の保護基
板（図示せず）が接着される。以上の工程後、ヘッドテ
ープ摺動面がラップされて完成される。第３図における
４６は磁気記録媒体であり４７はその走行方向を示すも
のである。In FIG. 3, a first insulating layer (not shown) such as 5iQ2 or Al2O3 is formed on a ferromagnetic substrate 41 by sputtering or the like, and then a magnetoresistive element (MRE) is formed on it by sputtering or the like.
) for applying a bias magnetic field to the first conductive thin film 42
is formed. Au or Al with Cr base as material
It is patterned into a predetermined shape using photolithography technology. Then 5102. Al2O3
A second insulating layer (not shown) is formed by vapor deposition sputtering or the like. As MRE43 on this second insulating layer,
After a Ni--Fe thin film is formed by electron beam evaporation sputtering or the like so that the track width direction is the axis of easy magnetization, it is magnetized into fine patterns using photolithography technology. Next, a second conductor thin film 4sa is formed to flow a sense current to the MRE.
, 4sb are formed and patterned. After a third insulating layer (not shown) is formed on these, a ferromagnetic thin film, such as a Ni-Fe thin film or a Fe-Al- A 3L thin film or an amorphous soft magnetic film is formed, and a front yoke portion 44a and a rear yoke portion 44b are constructed using photolithography technology. At this time, the front yoke portion 44a
The rear yoke portion 44b partially overlaps with the MRE 43, and is configured so that the signal magnetic field from the magnetic recording medium is easily guided to the MR'H. Next, a passivation film (not shown) such as Sin or 5i02 is formed, and then a protective substrate (not shown) made of glass, ceramics, etc. is bonded with an adhesive or the like. After the above steps, the head tape sliding surface is wrapped and completed. 46 in FIG. 3 is a magnetic recording medium, and 47 indicates its running direction.
以下、このＭＲＨの動作について述べる。The operation of this MRH will be described below.
ＭＲＥにおける抵抗変化ΔＲは電流の向きとＭ、ＲＥの
磁化の向きとがなす角度をθ、最大抵抗変化をＡＲとし
た時以下の（１）式に示す関係がａｘ
成立する。For the resistance change ΔR in the MRE, the relationship expressed by the following equation (1) holds true, where θ is the angle between the direction of the current and the direction of magnetization of M and RE, and AR is the maximum resistance change.
ΔＲ＝ΔＲｍａｘｃｏＳ２θ ・・・・・・・
・・・・・（１）また、ＭＲＥ内の信号磁束密度Ｂ ・
、ＭＲＥの１１ｑ
飽和磁束密度をＢＳとした時、近似的にが成立し、（１
）式、＠）式よシ
が導れる。即ちＭＲＥは磁界変化に対して、第４図のよ
うな抵抗変化を示す。ΔR=ΔRmaxcoS2θ ・・・・・・・・・
...(1) Also, the signal magnetic flux density B in the MRE
, when the 11q saturation magnetic flux density of MRE is BS, approximately holds true, and (1
) expression, @) expression can lead to shi. That is, the MRE exhibits resistance changes as shown in FIG. 4 in response to magnetic field changes.
発明が解決しようとする問題点
しかしながらＭＲヘッドは第４図に示したように、２次
関数的な抵抗変化をする。このため、その出力には２次
歪を多く含む欠点があった。そこで、ＭＲＨには、その
素子長さ方向にバイアス磁界が印加される。第３図のヨ
ークタイプＭＲヘッドでは、導体薄膜４２に電流を通じ
、これによる誘導磁界をバイアス磁界として利用し、動
作点を第４図の６０の位置にすることにより、高感度化
及び線形応答性の改善が行われる。しかしこのような工
夫をしても、大きな信号磁界がＭＲＥに印加されると、
２次歪を多く発生する問題はさけられないものであった
。Problems to be Solved by the Invention However, as shown in FIG. 4, the MR head exhibits a quadratic resistance change. For this reason, the output has the drawback of containing a large amount of second-order distortion. Therefore, a bias magnetic field is applied to the MRH in the length direction of the element. In the yoke type MR head shown in Fig. 3, current is passed through the conductive thin film 42, the induced magnetic field is used as a bias magnetic field, and the operating point is set at position 60 in Fig. 4, thereby achieving high sensitivity and linear response. Improvements will be made. However, even with these measures, when a large signal magnetic field is applied to the MRE,
The problem of generating a large amount of secondary distortion was unavoidable.
一般に磁気記録媒体か″ら、ＭＲヘッドへ流入する信号
磁束は、磁性媒体上の記録波長が長くなるに従って増大
する。従って、ＭＲヘッドの感度をその使用する波長の
最短波長に注目して設定し必要なＳ／Ｎを確保すると、
長波長側での信号磁束が大きくなりすぎ、２次歪が急激
に増大する欠点があった。特に、アナログ信号を記録再
生する装置においてはこれらは大きな問題点であった。Generally, the signal magnetic flux flowing into the MR head from the magnetic recording medium increases as the recording wavelength on the magnetic medium becomes longer. Therefore, the sensitivity of the MR head should be set with attention to the shortest wavelength of the wavelengths used. After securing the necessary S/N,
There was a drawback that the signal magnetic flux on the long wavelength side became too large, resulting in a sudden increase in second-order distortion. In particular, these have been a major problem in devices that record and reproduce analog signals.
以上の問題点を鑑み、本発明の目的は、使用する全波長
帯域で、再生感度に優れＳ／Ｈの良好な再生を行うとと
もに、２次歪が極めて少ない再生を行う磁気抵抗型ヘッ
ドを提供することにある。In view of the above-mentioned problems, an object of the present invention is to provide a magnetoresistive head that performs reproduction with excellent reproduction sensitivity and good S/H in the entire wavelength band used, as well as reproduction with extremely low secondary distortion. It's about doing.
問題点を解決するための手段
以上目的を達成するために本発明の磁気抵抗型ヘッドで
は、磁気記録媒体からの信号磁束を感知する磁気抵抗素
子を少くとも２つ以上、磁性基板上に形成し、そして磁
気記録媒体からの信号磁束を上記磁気抵抗素子へ導くた
めのヨークを形成し上記磁気抵抗素子を磁気的に直列に
結合することによって、前記磁性媒体からの信号磁束を
、前記の少なくとも２つ以上の磁気抵抗素子へ順次導く
ような構成したことを特徴としている。Means for Solving the Problems In order to achieve the above object, the magnetoresistive head of the present invention has at least two magnetoresistive elements formed on a magnetic substrate to sense the signal magnetic flux from the magnetic recording medium. , and by forming a yoke for guiding the signal magnetic flux from the magnetic recording medium to the magnetoresistive element and magnetically coupling the magnetoresistive elements in series, the signal magnetic flux from the magnetic medium is guided to the at least two magnetoresistive elements. It is characterized in that it is configured to lead to three or more magnetoresistive elements sequentially.
作 用
本発明は以上の構成により、磁気記録媒体からの信号磁
界は、まずヨークに導かれて磁気抵抗素子へ流入する。Operation According to the above-described configuration of the present invention, the signal magnetic field from the magnetic recording medium is first guided to the yoke and flows into the magnetoresistive element.
ヨークは少なくとも２つ以上の磁気抵抗素子を磁気的に
直列結合するように形成されているので、磁気記録媒体
からの信号磁束は、磁性媒体との距離が小さい磁気抵抗
素子から、大きい磁気抵抗素子へと順次、流入すること
になる。Since the yoke is formed to magnetically couple at least two or more magnetoresistive elements in series, the signal magnetic flux from the magnetic recording medium is transmitted from the magnetoresistive element with a smaller distance to the magnetic medium to the larger magnetoresistive element. It will gradually flow into.
この時、ヨーク及び磁気抵抗素子は磁性基板上に平行に
形成されており、磁性媒体からの距離が大きくなる従っ
て、ヨーク及び磁気抵抗素子を流れる信号磁束は、磁性
基板へ漏洩し減衰する。At this time, the yoke and the magnetoresistive element are formed in parallel on the magnetic substrate, and as the distance from the magnetic medium increases, the signal magnetic flux flowing through the yoke and the magnetoresistive element leaks to the magnetic substrate and is attenuated.
従って、信号磁束が小さい短波長側の再生は、磁気記録
媒体からの最も近い位置に形成された磁気抵抗素子で行
い、記録波長が長波長になるに従い、徐々に磁性媒体か
ら離れた位置に形成された磁気抵抗素子を用いることに
より、小入力時の短波長領域でのＳ／Ｎなどを劣化させ
ず長波長側の大入力信号を適当に減衰させ、長波長領域
の２次歪を大幅に改善できることになる。Therefore, reproduction of shorter wavelengths with smaller signal magnetic flux is performed using the magnetoresistive element formed at the position closest to the magnetic recording medium, and as the recording wavelength becomes longer, the magnetic resistance element is formed at a position gradually farther away from the magnetic medium. By using a magnetoresistive element, large input signals on the long wavelength side can be appropriately attenuated without deteriorating the S/N in the short wavelength region during small inputs, and the second-order distortion in the long wavelength region can be significantly reduced. It can be improved.
実施例
第１図は本発明の一実施例の磁気抵抗型ヘッド（ＭＲヘ
ッド）を示すもので、磁性基板上に２つのＭＲＥを形成
した場合を示すものである。Embodiment FIG. 1 shows a magnetoresistive head (MR head) according to an embodiment of the present invention, in which two MREs are formed on a magnetic substrate.
第１図において、まずフェライトなどの強磁性基板１１
上に５ｉ０２薄膜などの第１絶縁層（図示せず）をスパ
ッタ技術などを用いて形成する。次いでその上に、後に
形成されるＭＲＥに対してバイアス磁界を印加するため
の導体電極１６を、Ｃｒ下地のＡｕ薄膜などで所定の形
状にパターン化して形成する。In FIG. 1, first, a ferromagnetic substrate 11 such as ferrite
A first insulating layer (not shown) such as a 5i02 thin film is formed thereon using a sputtering technique or the like. Next, a conductive electrode 16 for applying a bias magnetic field to the MRE to be formed later is formed thereon by patterning it into a predetermined shape using an Au thin film with a Cr base or the like.
その上に第２の絶縁層（図示せず）を形成し、次いでそ
の上にＮ ｉ−Ｆ ｅ薄膜を電子ビーム蒸着でトラック
幅方向が磁化容易軸となるように形成した後、フォトリ
ングラフィ技術で、第１のＭＲＥ１２と第２のＭＲＥ１
３の２つのＭＲＥを形成する。本実施例においては、素
子幅１０μｍ、素子厚４００人、素子長はｅｓｏμｍの
ストライプ状にパターン化した。A second insulating layer (not shown) is formed thereon, and then a Ni-Fe thin film is formed thereon by electron beam evaporation so that the track width direction is the axis of easy magnetization. In technology, the first MRE12 and the second MRE1
Form two MREs of 3. In this example, the device was patterned into a stripe shape with an element width of 10 μm, an element thickness of 400 μm, and an element length of eso μm.
次いでＣｒ下地のＡｕ導体薄膜が形成され、所定の形状
にパターン化され、第１および第２のＭＲＥにセンス電
流を通じるための電極１４ａ。Next, a thin Au conductor film with a Cr base is formed and patterned into a predetermined shape to form an electrode 14a for passing a sense current to the first and second MREs.
１４ｂ、１ｓａ 、１６ｂが形成される。14b, 1sa, and 16b are formed.
これらの上に第３絶縁層（図示せず）が形成された後、
磁気記録媒体からの信号磁束とＭＲＥに導くために、強
磁性薄膜例えば、Ｎｉ−Ｆｅ薄膜やアモルファス軟磁性
薄膜が０．７μｍ〜１μｍ程度形成され、フォトリング
ラフィ技術によって前部ヨーク１７ａ、中央ヨーク１７
ｂ、後部ヨーク１７ｃが形成される。本実施例において
は、この時、前部ヨーク１７ａ、中央ヨーク１７ｂ、後
部ヨーク１７ｃのそれぞれは、第１のＭＲＥ１２及び第
２のＭＲＥ１３と２μｍオーバラップするように形成さ
れている。After a third insulating layer (not shown) is formed on these,
In order to guide the signal magnetic flux from the magnetic recording medium and the MRE, a ferromagnetic thin film, such as a Ni-Fe thin film or an amorphous soft magnetic thin film, is formed with a thickness of about 0.7 μm to 1 μm, and the front yoke 17a and the central yoke are formed using photolithography technology. 17
b, the rear yoke 17c is formed. In this embodiment, each of the front yoke 17a, the center yoke 17b, and the rear yoke 17c is formed to overlap the first MRE 12 and the second MRE 13 by 2 μm.
次いで、パッシベーション膜として第４絶縁層（図示せ
ず）が形成され、その後、セラミック保護基板が接着さ
れ、ヘッドの磁気記録媒体摺動面がラップされて磁気抵
抗型ヘッドが完成される。Next, a fourth insulating layer (not shown) is formed as a passivation film, and then a ceramic protection substrate is bonded and the magnetic recording medium sliding surface of the head is wrapped to complete a magnetoresistive head.
１８は磁気記録媒体である。18 is a magnetic recording medium.
次に上述した磁気抵抗型ヘッドをアナログオーディオテ
ープレコーダの再生ヘッドとして使用した場合について
述べる。第２図はこの場合のアナログオーディオテープ
レコーダのブロック図である。第２図において、２１は
磁気テープであシ、テープスピードは４．７６α／Ｓで
ある。磁気テープ上の記録波長が４μｍよりも小さい、
即ち周波数が約１０ ＫＨｚ以上の信号は第１のＭＲＥ
２２で再生し、記録波長が４μｍ以上、即ち１０ ＫＨ
ｚ以下の信号は、信号大人を減衰させて、第２のＭＲＥ
２３で再生した。Next, a case will be described in which the above-described magnetoresistive head is used as a playback head of an analog audio tape recorder. FIG. 2 is a block diagram of an analog audio tape recorder in this case. In FIG. 2, 21 is a magnetic tape, and the tape speed is 4.76α/S. The recording wavelength on the magnetic tape is smaller than 4 μm,
That is, signals with a frequency of about 10 KHz or more are sent to the first MRE.
22, and the recording wavelength is 4 μm or more, that is, 10 KH.
Signals below z are transmitted to the second MRE by attenuating the signal adult.
I played it on 23.
このため、第１のＭＲＥ２２で再生された信号は、第１
の増幅器２４で適当に増幅され、その後、カットオフ周
波数１０ ＫＨｚのバイパスフィルタ２５に通され、ま
た、第２のＭＲＥ２３で再生された信号は、第１のＭＲ
Ｅ２２の増幅後の信号レベルを考慮して第２の増幅器２
８で増幅された後、カットオフ周波９１１０ ＫＨｚの
ローパスフィルタ２７に通されこれらを合成した後、周
波数特性が平坦になるようにイコライザー回路２８を通
して信号再生が行われる。Therefore, the signal reproduced by the first MRE 22 is
The signal is suitably amplified by an amplifier 24, then passed through a bypass filter 25 with a cutoff frequency of 10 KHz, and regenerated by the second MRE 23.
Considering the signal level after amplification of E22, the second amplifier 2
After being amplified by 8, the signal is passed through a low-pass filter 27 with a cutoff frequency of 9110 KHz to synthesize these signals, and then the signal is reproduced through an equalizer circuit 28 so that the frequency characteristics are flat.
以上のように構成された本実施例では、磁気記録媒体上
の記録レベル２５０ ｎＷｂ ７ｍの時、上記構成に基
づく磁気抵抗型ヘッドの再生信号としてＳ／Ｎ比、約ｓ
ｓ ｄＢ、信号レベルに対する高周波歪成分３６〜４
０ｄＢを達成することができた。In this embodiment configured as above, when the recording level on the magnetic recording medium is 250 nWb 7 m, the S/N ratio of the reproduction signal of the magnetoresistive head based on the above configuration is approximately s.
s dB, high frequency distortion component relative to signal level 36-4
We were able to achieve 0dB.
これは、従来のハイファイアナログレコーディングの規
格を十分に満たすものである。This fully satisfies the standards of conventional high-fidelity analog recording.
なお、本実施例においては、ＭＲＥを２つ形成し、これ
を順次結合するようにヨークを形成して構成した磁気抵
抗型ヘッドについて述べているが、２個以上のＭＲＥを
形成し、これを磁気回路的に直列結合するように２個以
上の中央ヨークを形成し、それぞれのＭＲＥが再生すべ
き周波数成分をより細分して、磁気記録媒体からの信号
を再生してもよい。In this embodiment, a magnetoresistive head is described in which two MREs are formed and a yoke is formed to connect them sequentially. Two or more central yokes may be formed so as to be connected in series in a magnetic circuit, and the frequency components to be reproduced by each MRE may be further divided to reproduce the signal from the magnetic recording medium.
また、本実施例においては、磁性基板としてフェライト
ブロックを使用しているが、アルミナなどのセラミック
基板上に、パーマロイ、センダスト、アモルファス軟磁
性膜を形成したものを磁性基板として使用してもよい。Further, in this embodiment, a ferrite block is used as the magnetic substrate, but a ceramic substrate such as alumina on which a permalloy, sendust, or amorphous soft magnetic film is formed may also be used as the magnetic substrate.
発明の効果
以上のように本発明の磁気ヘッドに高密度化に伴う、狭
トラ”ツタ化、マルチトラック化が容易に達成できると
同時に使用する全周波数領域においてＳ／Ｎ比が良く、
高調波歪成分も極めて少ない高品位なアナログ信号の再
生を可能にするものである。Effects of the Invention As described above, the magnetic head of the present invention can easily achieve narrow tracks and multi-tracks due to high density, and at the same time has a good S/N ratio in all frequency ranges used.
This makes it possible to reproduce high-quality analog signals with extremely low harmonic distortion components.
この他、本発明による磁気抵抗型ヘッドは、半導体製造
プロセスと同じように１枚の基板上に薄膜を形成し、フ
ォトリソグラフィ技術を用いて製造すれば、再生特性の
揃った磁気ヘッドを大量に安価に製造できる利点も有す
るものである。In addition, the magnetoresistive head according to the present invention can be produced in large quantities by forming a thin film on a single substrate and using photolithography technology, similar to the semiconductor manufacturing process, to produce magnetic heads with uniform reproduction characteristics. It also has the advantage that it can be manufactured at low cost.
【図面の簡単な説明】
第１図は本発明の一実施例における磁気抵抗型ヘッドの
斜視図、第２図は同磁気抵抗型ヘッドをアナログオーデ
ィオテープレコーダに適用した場合の概略構成を示すブ
ロック図、第３図は従来の磁気抵抗型ヘッドの斜視図、
第４図は一般的なＭＲＥの磁界強度と抵抗変化との関係
を示す特性図である。
１１・・・・・・磁性基板、１２．１３・・・・・・磁
気抵抗素子（ＭＲＥ）、１４ａ、１．＊ｂ、１ｓａ、１
ｓｂ・・・・・・センス電流を通じるための電極、１６
・・・・・・導体電極、１７ａ・・・・・・前部ヨーク
、１アｂ・・・・・・中央ヨーク、１７ｃ・・・・・・
後部ヨーク、１８・・・・・・磁気記録媒体。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名１／
−−一灘す１性１１及
１２．１３−−− Ｍ Ｒ已
ｌ朝助１５４店ｂ−−一電狐
１６一−−傳体電也
／７ｏ−−一前籠ヨーク
ｌ＆−−一朧気記鋒珠皐
光障毒出層曽量
第 ２ 図
第３図[Brief Description of the Drawings] Fig. 1 is a perspective view of a magnetoresistive head according to an embodiment of the present invention, and Fig. 2 is a block diagram showing a schematic configuration when the magnetoresistive head is applied to an analog audio tape recorder. Figure 3 is a perspective view of a conventional magnetoresistive head.
FIG. 4 is a characteristic diagram showing the relationship between magnetic field strength and resistance change of a general MRE. 11... Magnetic substrate, 12.13... Magnetoresistive element (MRE), 14a, 1. *b, 1sa, 1
sb... Electrode for passing sense current, 16
...Conductor electrode, 17a...Front yoke, 1ab...Central yoke, 17c...
Rear yoke, 18...Magnetic recording medium. Name of agent: Patent attorney Toshio Nakao and 1 other person1/
--Ichinadasu 1 sex 11 and 12.13 --- M R Asauke 154 shop b -- Ichidenkitsune 161 -- Dentai Denya/7o -- Ichimae basket York l & -- Ichiroki Figure 2 Figure 3
Claims (1)
果を利用して読み出す磁気抵抗型ヘッドであって磁性基
板上に少なくとも２つ以上の磁気抵抗素子を有するとと
もに磁気記録媒体からの信号磁束を前記の磁気抵抗素子
に導くためのヨークとを有し、前記磁気抵抗素子を磁気
的に直列に結合したことを特徴とする磁気抵抗型ヘッド
。A magnetoresistive head that reads information recorded on a magnetic medium using the magnetoresistive effect of a ferromagnetic metal, which has at least two or more magnetoresistive elements on a magnetic substrate and which receives signal magnetic flux from the magnetic recording medium. and a yoke for guiding the magnetoresistive element to the magnetoresistive element, and the magnetoresistive element is magnetically coupled in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5251887A JPS63220409A (en) | 1987-03-06 | 1987-03-06 | Magnetoresistance type head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5251887A JPS63220409A (en) | 1987-03-06 | 1987-03-06 | Magnetoresistance type head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63220409A true JPS63220409A (en) | 1988-09-13 |
Family
ID=12916958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5251887A Pending JPS63220409A (en) | 1987-03-06 | 1987-03-06 | Magnetoresistance type head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63220409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0519182A2 (en) * | 1991-04-22 | 1992-12-23 | Sharp Kabushiki Kaisha | Combined thin film magnetic head |
-
1987
- 1987-03-06 JP JP5251887A patent/JPS63220409A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0519182A2 (en) * | 1991-04-22 | 1992-12-23 | Sharp Kabushiki Kaisha | Combined thin film magnetic head |
| EP0519182A3 (en) * | 1991-04-22 | 1994-07-27 | Sharp Kk | Combined thin film magnetic head |
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