JPS58108027A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPS58108027A JPS58108027A JP20357081A JP20357081A JPS58108027A JP S58108027 A JPS58108027 A JP S58108027A JP 20357081 A JP20357081 A JP 20357081A JP 20357081 A JP20357081 A JP 20357081A JP S58108027 A JPS58108027 A JP S58108027A
- Authority
- JP
- Japan
- Prior art keywords
- film
- magnetic
- magnetic field
- hall element
- magnetic head
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/37—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using galvano-magnetic devices, e.g. Hall-effect devices using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect
- G11B5/372—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using galvano-magnetic devices, e.g. Hall-effect devices using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect in magnetic thin films
- G11B5/374—Integrated structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
- H01L23/49589—Capacitor integral with or on the leadframe
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は磁気ヘッドに係り、記録媒体の記録′磁化を導
く磁極間に垂直磁化膜よりなるホール素子を設け、この
ホール素子にバイアス磁場を印加し得る構成とすること
により、信号磁場を効果的に電気信号に変換でき、しか
も外部磁場によるノイズは小さく、シ對の良好なもので
あり、高感度でかつ小型化の容易な磁気ヘッドを提供す
ることを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and has a structure in which a Hall element made of a perpendicularly magnetized film is provided between magnetic poles that guide recording magnetization of a recording medium, and a bias magnetic field can be applied to the Hall element. The purpose of the present invention is to provide a magnetic head that can effectively convert a signal magnetic field into an electric signal, has low noise caused by an external magnetic field, has a good image quality, has high sensitivity, and is easily miniaturized. .
例えば電磁誘導型の薄膜磁気ヘッドは、薄膜で構成する
リング状磁極と薄膜で構成するコイルとによってなって
いるが、このような薄膜磁気ヘッドはコイルの巻数を多
くできず、低い周波数領域での再生出力が小さい欠点が
あり、又、磁気抵抗効果型薄膜磁気ヘッドは、強磁性薄
膜磁気抵抗素子の磁化容易軸が薄膜面内にあるので、面
内を磁束が有効に通るように構成することは困難であり
、再生出力が小さい欠点がある。For example, an electromagnetic induction type thin-film magnetic head consists of a ring-shaped magnetic pole made of a thin film and a coil made of a thin film, but such thin-film magnetic heads cannot have a large number of coil turns, and are difficult to operate in low frequency ranges. The disadvantage is that the reproduction output is small, and since the axis of easy magnetization of the ferromagnetic thin film magnetoresistive element lies within the plane of the thin film, the magnetoresistive thin film magnetic head must be constructed so that the magnetic flux can effectively pass within the plane. is difficult, and has the drawback of low playback output.
本発明は上記欠点を除去するものであり、以下その実施
例について説明する。The present invention eliminates the above-mentioned drawbacks, and embodiments thereof will be described below.
まず、本発明の具体的実施例について述べる前に、例え
ば第１図ａ、ｂに示す構成の磁気ヘッド、すなわち基板
１上に例えばパーマロイ等の軟磁性膜２を設け、この上
に絶縁膜３を介してＧｄ Ｆｅ又はＧｄ０ｏ等の垂直磁
化膜よりなるホール素子４を設け、さらにこの上に絶縁
膜３′を介してパーマロイ等の軟磁性膜２′を設けた積
層構造の磁気ヘッドを考えると、磁気ヘッドに摺接した
記録媒体５の記録磁化による磁束は軟磁性膜２′、ホー
ル素子４、軟磁性膜２の磁気ループを構成するのである
が、ホール素子４では膜面にほぼ垂直に磁束が通るので
、記録磁化に応じたホール電圧Ｖｌ（が誘起され、記録
媒体の磁化信号が電気信号に変換されるようになる。尚
、第１図ａ中、６はホール電圧端子、７．７′は電流端
子で、これらはホール素子４に電気的に接続されている
。First, before describing specific embodiments of the present invention, a magnetic head having the structure shown in FIGS. Considering a magnetic head with a laminated structure in which a Hall element 4 made of a perpendicularly magnetized film such as GdFe or Gd0o is provided through a magnetic field, and a soft magnetic film 2' such as permalloy is further provided on this through an insulating film 3'. The magnetic flux due to the recording magnetization of the recording medium 5 that is in sliding contact with the magnetic head forms a magnetic loop between the soft magnetic film 2', the Hall element 4, and the soft magnetic film 2. In the Hall element 4, the magnetic flux is generated almost perpendicularly to the film surface. Since the magnetic flux passes through, a Hall voltage Vl (corresponding to the recorded magnetization) is induced, and the magnetization signal of the recording medium is converted into an electric signal. In FIG. 1a, 6 is a Hall voltage terminal, 7. Reference numeral 7' designates current terminals, which are electrically connected to the Hall element 4.
ところで、ＧｄＦｅ又はＧｄ０ｏ等の垂直磁化膜のホー
ル特性は、第２図に示すようなヒステリシス特性を示し
、膜面に印加される磁場Ｈによって垂直磁化膜の磁化が
反転した場合のみホール電圧が反転するので、交流磁場
の場合には抗磁場Ｈｃより大きな磁場が印加された場合
のみ出力電圧変化として検出できるようになる。By the way, the Hall characteristics of a perpendicularly magnetized film such as GdFe or Gd0o exhibit a hysteresis characteristic as shown in Figure 2, and the Hall voltage is reversed only when the magnetization of the perpendicularly magnetized film is reversed by the magnetic field H applied to the film surface. Therefore, in the case of an alternating magnetic field, a change in the output voltage can be detected only when a magnetic field larger than the coercive field Hc is applied.
このような考えに基いて本発明はなされたものであり、
以下その具体的実施例について述べる。The present invention was made based on this idea,
A specific example will be described below.
第３図は本発明に係る磁気ヘッドの１実施例を示すもの
で、同図中、１０は軟磁性基板であり、この軟磁性基板
１０上に電気絶縁膜１１を介してＧｄＦｅ又はＧｄ０ｏ
等の垂直磁化膜よりなるホール素子１２が設けられてお
り、このホール素子１２上には電気絶縁膜１３を介して
軟磁性膜１４が設けられている。FIG. 3 shows one embodiment of the magnetic head according to the present invention. In the figure, 10 is a soft magnetic substrate, and GdFe or Gd0O is deposited on this soft magnetic substrate 10 via an electrical insulating film 11.
A Hall element 12 made of a perpendicularly magnetized film is provided, and a soft magnetic film 14 is provided on this Hall element 12 with an electrical insulating film 13 interposed therebetween.
１５は例えばＳｉＯ□膜等のギャップであり、このギャ
ップ１５は電気絶縁膜１１と１３との間の記録媒体摺接
面側に設けられており、又、１６は金属模によるバイア
ス磁場印加用の導体膜であり、この導体膜１６は電気絶
縁膜１１と１３との間でホール素子１２を中心としてギ
ャップ１′Ｓと反対側に設けられている。15 is a gap made of, for example, a SiO□ film, and this gap 15 is provided on the recording medium sliding surface side between the electrical insulating films 11 and 13, and 16 is a gap made of a metal pattern for applying a bias magnetic field. This conductive film 16 is provided between the electrically insulating films 11 and 13 on the side opposite to the gap 1'S with the Hall element 12 in the center.
上記のように構成された薄膜磁気ヘッドにおいて、導体
膜１６に第３図中紙面に垂直方向に電流が流されると、
軟磁性膜１４、ホール素子１２、軟磁性基板１０による
磁気ループによってホール素子１２には導体膜１６に流
される電流に応じたバイアス磁場Ｈｅが印加される。又
、記録媒体が摺接していると、記録媒体の記録磁化より
の信号磁場Ｈ８が、軟磁性膜１４、ホール素子１２、軟
磁性基板１０による磁気ループによってホール素子１２
に印加される。In the thin film magnetic head configured as described above, when a current is passed through the conductor film 16 in a direction perpendicular to the plane of the paper in FIG.
A bias magnetic field He corresponding to the current flowing through the conductive film 16 is applied to the Hall element 12 by a magnetic loop formed by the soft magnetic film 14, the Hall element 12, and the soft magnetic substrate 10. Further, when the recording medium is in sliding contact, the signal magnetic field H8 from the recording magnetization of the recording medium is transmitted to the Hall element 12 by a magnetic loop formed by the soft magnetic film 14, the Hall element 12, and the soft magnetic substrate 10.
is applied to
そして、第４図に示すように、例えば信号磁場Ｈｓに比
べて高い周波数で抗磁場Ｈｃ よりピーク値がわずか
に小さなバイアス磁場ＨＢが信号磁場Ｈｓと共にホール
素子に印加されると、信号磁場Ｈｓの時間ｔによる変化
はＶＨ８で示されるような電気信号に変換されるものと
なり、バイアス磁場ＨＢのピーク値Ｈｏｐを適当な値に
選ぶことによって小さな振幅の信号磁場でも電気信号と
して検出できるようになる。すなわち、信号磁場のピー
ク値Ｈｓｐが抗磁場Ｈｃより小さな場合でも電気信号と
して検出できるのである。As shown in FIG. 4, for example, when a bias magnetic field HB with a higher frequency than the signal magnetic field Hs and a peak value slightly smaller than the coercive magnetic field Hc is applied to the Hall element together with the signal magnetic field Hs, the signal magnetic field Hs increases. Changes due to time t are converted into an electrical signal as shown by VH8, and by selecting an appropriate value for the peak value Hop of the bias magnetic field HB, even a signal magnetic field with a small amplitude can be detected as an electrical signal. That is, even if the peak value Hsp of the signal magnetic field is smaller than the coercive magnetic field Hc, it can be detected as an electrical signal.
伺、ｔ’（ａｔ’はＨｃより少々大きい場合でも良く、
例えば磁場のしきい値ΔＨ＝ ＩＨＢＰ ＨＣＩ
と信号磁場Ｈｓのピーク値Ｈ［ｌＰとがＨｉｐ≧ΔＨで
あれば良い。However, t'(at' may be slightly larger than Hc,
For example, magnetic field threshold ΔH = IHBP HCI
It is sufficient if Hip≧ΔH and the peak value H[lP of the signal magnetic field Hs are satisfied.
上述の如く、本発明に係る磁気ヘッドは、磁気ヘッドの
磁極間に垂直磁化膜よりなるホール素子を設け、このホ
ール素子にバイアス磁場を与える手段を備えたので、再
生に際して記録媒体の信号磁化が小さくても有効に電気
信号に変換でき、検出感度が高く、高感度な磁気ヘッド
となり、又磁気抵抗効果型磁気ヘッドのような特別な磁
気シールドは不要で、外部からの磁場は磁気ループを形
成しないのでこの外部磁場によるノイズは小さく、又記
録媒体の信号磁化を電気信号に変換する変換部の面積は
小さく、小型化及び多チャンネル化が容易で、さらには
簡単な構成で高性能なものである等の特長を有する。As described above, the magnetic head according to the present invention includes a Hall element made of a perpendicularly magnetized film between the magnetic poles of the magnetic head and means for applying a bias magnetic field to the Hall element, so that the signal magnetization of the recording medium is controlled during reproduction. Even if it is small, it can be effectively converted into an electric signal, resulting in a highly sensitive magnetic head with high detection sensitivity. Also, there is no need for a special magnetic shield like in a magnetoresistive magnetic head, and external magnetic fields form a magnetic loop. Therefore, the noise caused by this external magnetic field is small, and the area of the converter that converts the signal magnetization of the recording medium into an electric signal is small, making it easy to miniaturize and increase the number of channels.Furthermore, it has a simple configuration and high performance. It has certain features such as:
第１図ａ、ｂは本発明に係る磁気ヘッドの実施例を説明
する為の亨備説明図、第２図は垂直磁化膜のホール特性
説明図、第３図は本発明に係る磁気ヘッドの１実施例を
示す説明図、第４図は本発明に係る磁気ヘッドの磁気−
電気信号変換を示す説明図である。
１０・・・軟磁性基板、１１．１３・・・電気絶縁膜、
１２・・・ホール素子、１４・・・軟磁性膜、１５・・
・ギャップ、１６・・・導体膜。
特許出願人 日本ビクター株式会社
補強
第２図 第′図′°′
第１図（ｂ）
第３図
第４図1a and 1b are explanatory diagrams for explaining an embodiment of the magnetic head according to the present invention, FIG. 2 is an explanatory diagram of the hole characteristics of a perpendicularly magnetized film, and FIG. FIG. 4 is an explanatory diagram showing one embodiment of the magnetic head according to the present invention.
FIG. 2 is an explanatory diagram showing electrical signal conversion. 10... Soft magnetic substrate, 11.13... Electrical insulating film,
12... Hall element, 14... Soft magnetic film, 15...
- Gap, 16... conductor film. Patent applicant: Victor Japan Co., Ltd. Reinforcement Figure 2 Figure 'Figure'°' Figure 1 (b) Figure 3 Figure 4
Claims (1)
設け、このホール素子にバイアス磁場を与える手段を備
えたことを特徴とする磁気ヘッド。1. A magnetic head comprising a Hall element made of a perpendicularly magnetized film between magnetic poles of the magnetic head, and means for applying a bias magnetic field to the Hall element.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20357081A JPS58108027A (en) | 1981-12-18 | 1981-12-18 | Magnetic head |
| US06/448,564 US4577250A (en) | 1981-12-18 | 1982-12-10 | Hall effect magnetic head |
| DE19823246282 DE3246282A1 (en) | 1981-12-18 | 1982-12-14 | HALL EFFECT MAGNETIC HEAD |
| GB08235922A GB2115204B (en) | 1981-12-18 | 1982-12-17 | Hall effect magnetic head |
| FR8221236A FR2518792B1 (en) | 1981-12-18 | 1982-12-17 | MAGNETIC HEAD WITH HALL EFFECT |
| FR868601114A FR2578343B1 (en) | 1981-12-18 | 1986-01-27 | MAGNETIC HEAD WITH HALL EFFECT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20357081A JPS58108027A (en) | 1981-12-18 | 1981-12-18 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58108027A true JPS58108027A (en) | 1983-06-28 |
| JPS639283B2 JPS639283B2 (en) | 1988-02-26 |
Family
ID=16476310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20357081A Granted JPS58108027A (en) | 1981-12-18 | 1981-12-18 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58108027A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4310993Y1 (en) * | 1964-07-30 | 1968-05-13 | ||
| JPS5661022A (en) * | 1979-10-24 | 1981-05-26 | Olympus Optical Co Ltd | Magnetic head |
-
1981
- 1981-12-18 JP JP20357081A patent/JPS58108027A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4310993Y1 (en) * | 1964-07-30 | 1968-05-13 | ||
| JPS5661022A (en) * | 1979-10-24 | 1981-05-26 | Olympus Optical Co Ltd | Magnetic head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS639283B2 (en) | 1988-02-26 |
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