JPS6224848B2 - - Google Patents
Info
- Publication number
- JPS6224848B2 JPS6224848B2 JP53154953A JP15495378A JPS6224848B2 JP S6224848 B2 JPS6224848 B2 JP S6224848B2 JP 53154953 A JP53154953 A JP 53154953A JP 15495378 A JP15495378 A JP 15495378A JP S6224848 B2 JPS6224848 B2 JP S6224848B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording
- main
- pole
- magnetoresistive element
- 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.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 claims description 89
- 230000035699 permeability Effects 0.000 claims description 11
- 230000005415 magnetization Effects 0.000 claims description 9
- 239000010408 film Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010409 thin film Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Magnetic Heads (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】
この発明は垂直磁化記録再生装置に関する。磁
気記録の記録密度を向上させる方法として、最近
垂直磁化記録方式が提案されている。これは磁気
記録媒体面に垂直な方向に信号を磁化するもの
で、一般に用いられている面方向に信号を磁化す
る方式とは異なり高い記録密度が得られるもので
ある。この垂直磁化記録の方法としては、日本応
用磁気学会第１会研究資料「磁気記録の将来に関
する一考案―垂直形磁気記録の可能性について」
（岩崎俊一昭和52年５月26日）に詳細に記載され
ているが概略は次のようなものである。すなわ
ち、第１図に示すように、高透磁率磁性膜よりな
る主磁極１の端部を磁気テープ２の磁性層３に接
触し、一方コイル４を巻いた高透磁率磁性体から
なる補助磁極５を磁気テープ２の反対側に配置
し、この補助磁極５により磁界を発生させ、この
磁界を主磁極１の先端、すなわち、磁気テープ２
に接している部分に集中させることにより磁気テ
ープ磁性層３を垂直方向に磁化する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a perpendicular magnetization recording/reproducing device. Perpendicular magnetization recording has recently been proposed as a method for improving the recording density of magnetic recording. This magnetizes signals in a direction perpendicular to the surface of the magnetic recording medium, and unlike the generally used method of magnetizing signals in the plane, a high recording density can be obtained. This method of perpendicular magnetization recording is described in the study material of the 1st meeting of the Japanese Society of Applied Magnetics, "An idea for the future of magnetic recording - On the possibility of perpendicular magnetic recording."
(Shunichi Iwasaki, May 26, 1972) describes this in detail, but the outline is as follows. That is, as shown in FIG. 1, the end of the main pole 1 made of a high permeability magnetic film is brought into contact with the magnetic layer 3 of the magnetic tape 2, while the auxiliary pole made of a high permeability magnetic material around which a coil 4 is wound is attached. 5 is placed on the opposite side of the magnetic tape 2, this auxiliary magnetic pole 5 generates a magnetic field, and this magnetic field is applied to the tip of the main magnetic pole 1, that is, the magnetic tape 2.
The magnetic tape magnetic layer 3 is magnetized in the perpendicular direction by concentrating it on the portion in contact with the magnetic tape.
ところがこのような第１図に示す磁気記録装置
には次のような問題点がある。すなわち、この装
置で再生を行おうとすると、出力電圧が非常に小
さく、実質上再生は不可能である。そのためこの
装置では再生に際しては従来方式のリング形再生
ヘツドを記録とは別に用意しなければならない。
その場所には、再生ヘツドが記録ヘツドと位置的
に離れていなければならないために、特に多トラ
ツクヘツドを用いてひとつのトラツクの信号を再
生し、それを他のトラツクに記録するような場所
には時間的なずれが問題となる。また、この装置
では主磁極を磁気テープと接触させて使用するた
めに摩耗し、主磁極と補助磁極間の間隔が変化し
ていき、初期に設定した最適記録磁界が使用とと
もに得られなくなつていく。 However, the magnetic recording device shown in FIG. 1 has the following problems. That is, when attempting to perform reproduction using this device, the output voltage is so low that reproduction is virtually impossible. Therefore, in this device, a conventional ring-shaped reproducing head must be prepared separately from the conventional ring type reproducing head for reproduction.
This is especially true in places where a multi-track head is used to play back the signal from one track and then record it on another track, since the playback head must be physically separated from the recording head. Time lag is a problem. In addition, because this device uses the main magnetic pole in contact with the magnetic tape, it wears out, and the distance between the main magnetic pole and the auxiliary magnetic pole changes, causing the initially set optimum recording magnetic field to become unobtainable as it is used. go.
さらにまた磁気テープに記録される磁界強度は
補助磁極の主磁極に対する相対的位置関係のばら
つき、および補助磁極の形状のばらつき、磁気特
性のばらつき、巻線数、巻線位置のばらつき等に
より変化し、最適な磁界を与える記録信号電流値
の設定のためにはその都度磁気テープに記録を行
い、それを再生してみて記録信号電流値を設定し
なければならない。 Furthermore, the strength of the magnetic field recorded on a magnetic tape varies due to variations in the relative position of the auxiliary pole to the main pole, variations in the shape of the auxiliary pole, variations in magnetic properties, variations in the number of windings, variations in the position of the windings, etc. In order to set a recording signal current value that provides an optimal magnetic field, it is necessary to record on a magnetic tape each time, and then read it back to set the recording signal current value.
この発明は以上のような問題点に鑑みてなされ
たもので、記録のほかに再生が可能であり、また
主磁極の摩耗等による記録磁界のばらつきをなく
すことのできる垂直磁化記録再生装置を提供する
ことを目的とする。 This invention has been made in view of the above-mentioned problems, and provides a perpendicular magnetization recording/reproducing device that is capable of reproducing in addition to recording, and is capable of eliminating variations in the recording magnetic field due to wear of the main magnetic pole, etc. The purpose is to
この発明は磁気抵抗素子を用い、この磁気抵抗
素子の側面に高透磁率磁性膜よりなる主磁極を形
成し、この主磁極にコイルを巻回して、これら膜
の端部をテープ磁性層に接触させるように配置し
て上記目的を達成したものである。 This invention uses a magnetoresistive element, forms a main pole made of a high permeability magnetic film on the side surface of the magnetoresistive element, winds a coil around this main pole, and brings the ends of these films into contact with the tape magnetic layer. The above objective was achieved by arranging the
以下この発明を図面を参照して詳細に説明す
る。第２図はこの発明の基本となる構成を示すも
ので、２１は磁気抵抗素子であり、この磁気抵抗
素子２１の片面には絶縁膜２２をはさんで高透磁
率磁性膜よりなる主磁極２３が形成されている。
そして主磁極２３にはコイル２４が巻回されてい
る。磁気テープ２はこれら積み重ねられた膜の端
部にテープ磁性層３が接触もしくは近接するよう
に走行せしめられる。磁気抵抗素子２１は公知の
Ni―Feの合金薄膜（200〜1000Å厚）により形成
されている。絶縁膜２２はSiO2等の非導電性の
薄膜であり、スパツター等の手段により形成され
ている。また主磁極２３はパーマロイ等の高透磁
率合金の薄膜（0.5〜10μｍ厚程度）よりなる。
絶縁膜２２は導電性を有する主磁極が磁気抵抗素
子２１をシヨートさせるのを防ぐために必要であ
るが、非導電性の主磁極（抵抗値の非常に高いフ
エライト膜等）があれば必ずしも必要ではない。 The present invention will be explained in detail below with reference to the drawings. FIG. 2 shows the basic structure of the present invention. Reference numeral 21 denotes a magnetoresistive element, and one side of the magnetoresistive element 21 has an insulating film 22 sandwiched therebetween, and a main magnetic pole 23 made of a high permeability magnetic film. is formed.
A coil 24 is wound around the main pole 23. The magnetic tape 2 is made to run so that the tape magnetic layer 3 contacts or approaches the ends of these stacked films. The magnetoresistive element 21 is a well-known
It is formed from a Ni-Fe alloy thin film (200 to 1000 Å thick). The insulating film 22 is a non-conductive thin film of SiO 2 or the like, and is formed by means such as sputtering. The main pole 23 is made of a thin film (approximately 0.5 to 10 μm thick) of a high magnetic permeability alloy such as permalloy.
The insulating film 22 is necessary to prevent the conductive main pole from shooting the magnetoresistive element 21, but it is not necessarily necessary if there is a non-conductive main pole (such as a ferrite film with a very high resistance value). do not have.
この装置による信号の記録は主磁極２１のコイ
ル２４に信号電流を流すことにより行われる。す
なわち、コイル２４に信号電流を流して主磁極２
３を形成する磁性膜を磁化しその先端から発生す
る磁界により磁気テープ磁性層３を垂直方向に磁
化記録する。 Signal recording by this device is performed by passing a signal current through the coil 24 of the main pole 21. That is, by passing a signal current through the coil 24, the main magnetic pole 2
The magnetic film forming the magnetic tape 3 is magnetized, and the magnetic field generated from the tip of the magnetic film records the magnetization of the magnetic tape magnetic layer 3 in the perpendicular direction.
一方、この装置の信号の再生は次のように行わ
れる。すなわち、記録された磁気テープ２を走行
させると、磁気抵抗素子２１の電気抵抗は磁気テ
ープ２から加わる磁界により変化する。したがつ
て第３図に示すように磁気抵抗素子２１に一定の
直流電流Ｉを流し、その両端の電圧変化Ｖを検出
して磁気抵抗素子の抵抗変化を電圧変化として検
出して再生出力を得る。この再生信号は増幅器２
５により増幅して取り出される。 On the other hand, signal reproduction of this device is performed as follows. That is, when the recorded magnetic tape 2 is run, the electrical resistance of the magnetoresistive element 21 changes due to the magnetic field applied from the magnetic tape 2. Therefore, as shown in FIG. 3, a constant DC current I is passed through the magnetoresistive element 21, and the voltage change V across it is detected, and the resistance change of the magnetoresistive element is detected as a voltage change to obtain a reproduction output. . This reproduced signal is sent to amplifier 2
5 and is amplified and extracted.
なお、磁気抵抗素子２３の磁界に対する非直線
性を改善するためにバイアス電流磁界を必要とす
る場合が多いが、この場合には再生時に主磁極２
３のコイル２４に直流電流を流すことによりその
目的を果すことができる。 Note that a bias current magnetic field is often required to improve the nonlinearity of the magnetoresistive element 23 with respect to the magnetic field, but in this case, the main magnetic pole 2
This purpose can be achieved by passing a direct current through the coil 24 of No. 3.
このようにこの発明の構成によると、従来の垂
直磁化用記録ヘツドでは不可能であつた信号の再
生が可能となつた。しかも、従来のように再生の
ために新たに再生ヘツドを配置した場合のような
記録位置と再生位置との位置ずれがない。したが
つて、特にトラツク方式の記録再生装置におい
て、ひとつのトラツクから再生した情報を他のト
ラツクに記録するような使用方法においては情報
の時間ずれが生じないので有効である。またこの
再生の際磁気抵抗素子の直線化バイアス磁界を主
磁極から発生させることができることもこの構成
の利点である。 As described above, according to the configuration of the present invention, it has become possible to reproduce signals that were impossible with conventional perpendicular magnetization recording heads. In addition, there is no positional deviation between the recording position and the reproduction position, unlike in the conventional case where a new reproduction head is placed for reproduction. Therefore, this is particularly effective in a track type recording/reproducing apparatus in which information reproduced from one track is recorded on another track because no time lag occurs in the information. Another advantage of this configuration is that the linearizing bias magnetic field of the magnetoresistive element can be generated from the main pole during reproduction.
また第１図のような補助磁極励磁型ヘツドにお
いて問題となつた補助磁極位置による記録磁界の
ばらつき、主磁極摩耗による補助磁極、主磁極間
距離変化による記録磁界変化の問題等は磁気テー
プ片側からの記録のためなくなつた。 In addition, problems such as variations in the recording magnetic field due to the position of the auxiliary magnetic pole, problems with the auxiliary magnetic pole due to wear of the main magnetic pole, and changes in the recording magnetic field due to changes in the distance between the main magnetic poles, which are problems with the auxiliary magnetic pole excitation type head shown in Figure 1, can be solved from one side of the magnetic tape. It disappeared because of the record of.
第４図は上記基本構成をもとに、さらに記録再
生効率の向上を達成すべくなされたこの発明の一
実施例を示すものである。この実施例は主磁極４
１，４２を磁気抵抗素子４３の両側に設けるとと
もに、磁気テープとの走行下流側に位置する主磁
極４１の側面に高透磁率部材４４を設けるように
したものである。このような構成によると、第１
の主磁極４１と第２の主磁極４２の両方で磁気テ
ープ２に記録されるようになるが、テープ走行に
沿つて下流側の主磁極、すなわち第４図で磁気テ
ープが矢印の方向に走行すると第１の主磁極４１
で最終的な記録がなされるため、実用上支障な
い。特に第１の主磁極４１には高透磁率部材４４
がそえられており、コイル４５により励磁される
と磁束が第１の主磁極４１に集束する形に構成さ
れているので第２の主磁極４２より第１の主磁極
４１の先端に強い磁界が発生できるので事実上第
１の主磁極４１のみが記録に寄与する。したがつ
て、高透磁率部材４４をそえることで記録効率が
あがる。またこの構造にすると磁気抵抗素子４３
をシールドして再生するので短波長再生に有効で
ある。尚図中４６は非磁性基板、４７は絶縁膜で
ある。 FIG. 4 shows an embodiment of the present invention based on the above-mentioned basic configuration, which is designed to further improve the recording and reproducing efficiency. In this embodiment, the main magnetic pole 4
1 and 42 are provided on both sides of the magnetoresistive element 43, and a high magnetic permeability member 44 is provided on the side surface of the main magnetic pole 41 located on the downstream side of the magnetic tape. According to such a configuration, the first
The magnetic tape 2 is recorded by both the main magnetic pole 41 and the second main magnetic pole 42, but as the tape runs, the main magnetic pole on the downstream side, that is, the magnetic tape runs in the direction of the arrow in FIG. Then, the first main magnetic pole 41
There is no practical problem because the final record is made at In particular, the first main pole 41 has a high magnetic permeability member 44.
The magnetic flux is focused on the first main pole 41 when excited by the coil 45, so a stronger magnetic field is applied to the tip of the first main pole 41 than the second main pole 42. Therefore, only the first main pole 41 actually contributes to recording. Therefore, by providing the high magnetic permeability member 44, recording efficiency is increased. Also, with this structure, the magnetoresistive element 43
It is effective for reproducing short wavelengths because it is shielded and reproduced. In the figure, 46 is a nonmagnetic substrate, and 47 is an insulating film.
第１図は従来の垂直磁化記録装置の構成図、第
２図はこの発明の基本となる垂直磁化記録再生装
置の構成図、第３図は第２図の構成において磁気
抵抗素子の抵抗変化を検出するための方法を説明
する図、第４図はこの発明の一実施例を示す図で
ある。
２…磁気テープ、３…磁性層、２１，４３…磁
気抵抗素子、２３，４１，４２…主磁極、２２，
４７…絶縁膜。
Fig. 1 is a block diagram of a conventional perpendicular magnetization recording device, Fig. 2 is a block diagram of a perpendicular magnetization recording/reproducing device which is the basis of the present invention, and Fig. 3 shows the resistance change of the magnetoresistive element in the configuration of Fig. 2. FIG. 4, which is a diagram illustrating a method for detection, is a diagram showing an embodiment of the present invention. 2... Magnetic tape, 3... Magnetic layer, 21, 43... Magnetoresistive element, 23, 41, 42... Main magnetic pole, 22,
47...Insulating film.
Claims (1)
られた磁気抵抗素子と、この磁気抵抗素子の両側
にそれぞれ配置された高透磁率磁性膜からなる主
磁極と、これら主磁極のうちの前記磁気記録媒体
の走行方向下流側に配置された主磁極の側面に設
けられた高透磁率部材と、この高透磁率部材およ
び前記主磁極の周囲に巻回されたコイルと、信号
記録時に前記コイルに所望の記録信号電流を供給
する手段と、信号再生時に前記磁気抵抗素子の磁
界に対する非直線性を補償するためのバイアス磁
界を前記主磁極より発生せしめるよう前記コイル
にバイアス電流を供給する手段と、前記磁気抵抗
素子の抵抗変化を検出する手段とを備えることを
特徴とする垂直磁化記録再生装置。1. A magnetoresistive element provided to face the magnetic surface of the magnetic recording medium, a main magnetic pole consisting of a high magnetic permeability magnetic film arranged on both sides of the magnetoresistive element, and the magnetic A high magnetic permeability member provided on the side surface of the main magnetic pole disposed on the downstream side in the running direction of the recording medium, a coil wound around the high magnetic permeability member and the main magnetic pole, and a coil wound around the coil during signal recording. means for supplying a desired recording signal current; and means for supplying a bias current to the coil so that the main magnetic pole generates a bias magnetic field for compensating for non-linearity with respect to the magnetic field of the magnetoresistive element during signal reproduction; A perpendicular magnetization recording/reproducing apparatus comprising: means for detecting a change in resistance of the magnetoresistive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15495378A JPS5584025A (en) | 1978-12-18 | 1978-12-18 | Vertical magnetization recorder/reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15495378A JPS5584025A (en) | 1978-12-18 | 1978-12-18 | Vertical magnetization recorder/reproducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5584025A JPS5584025A (en) | 1980-06-24 |
| JPS6224848B2 true JPS6224848B2 (en) | 1987-05-30 |
Family
ID=15595515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15495378A Granted JPS5584025A (en) | 1978-12-18 | 1978-12-18 | Vertical magnetization recorder/reproducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5584025A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57133513A (en) * | 1981-02-06 | 1982-08-18 | Fujitsu Ltd | Magnetic reluctance effect type recording and reproducing head |
| JPS58102323A (en) * | 1981-12-15 | 1983-06-17 | Seiko Epson Corp | Magnetic head |
| JPS58102324A (en) * | 1981-12-15 | 1983-06-17 | Seiko Epson Corp | Magnetic head |
| JPS58114322A (en) * | 1981-12-25 | 1983-07-07 | Mitsubishi Electric Corp | Electro-resistance effect type magnetic head |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215217B2 (en) * | 1972-10-06 | 1977-04-27 | ||
| JPS52147414A (en) * | 1976-06-03 | 1977-12-07 | Fujitsu Ltd | Magnetic head |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635942Y2 (en) * | 1975-07-21 | 1981-08-24 |
-
1978
- 1978-12-18 JP JP15495378A patent/JPS5584025A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215217B2 (en) * | 1972-10-06 | 1977-04-27 | ||
| JPS52147414A (en) * | 1976-06-03 | 1977-12-07 | Fujitsu Ltd | Magnetic head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5584025A (en) | 1980-06-24 |
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