JPH0283838A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH0283838A JPH0283838A JP23737688A JP23737688A JPH0283838A JP H0283838 A JPH0283838 A JP H0283838A JP 23737688 A JP23737688 A JP 23737688A JP 23737688 A JP23737688 A JP 23737688A JP H0283838 A JPH0283838 A JP H0283838A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thin film
- spot light
- film
- recording
- 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 title claims abstract description 73
- 239000010409 thin film Substances 0.000 claims abstract description 32
- 239000010408 film Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000005294 ferromagnetic effect Effects 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000035699 permeability Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 6
- 230000000644 propagated effect Effects 0.000 abstract description 6
- 230000005374 Kerr effect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000010287 polarization Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- 230000005674 electromagnetic induction Effects 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 229910002546 FeCo Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005417 remagnetization Effects 0.000 description 1
- 238000004544 sputter deposition 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
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10541—Heads for reproducing
- G11B11/10543—Heads for reproducing using optical beam of radiation
- G11B11/10547—Heads for reproducing using optical beam of radiation interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気記録装置に使用される磁気ヘッドに関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head used in a magnetic recording device.
Ｃ従来の技術〕
磁気記録装置に使用される磁気へラドは、船釣に電磁誘
導型と磁束感知型とに大別される。C. Prior Art] Magnetic discs used in magnetic recording devices are broadly classified into electromagnetic induction type and magnetic flux sensing type.
電磁誘導型の磁気ヘッドは、強磁性体からなる一対のコ
アを接合一体化したリング型あるいはＣ字型の閉磁路の
もので、その他にもヘッド基板上に薄膜パターンでヘッ
ド素子を形成したＷＸ膜型のものもある。この両者は、
共に磁束変化を電磁誘導により電気信号に変換して情報
再生する。Electromagnetic induction magnetic heads are ring-shaped or C-shaped closed magnetic circuits in which a pair of cores made of ferromagnetic material are joined together. There are also membrane types. Both of these are
Both convert magnetic flux changes into electrical signals through electromagnetic induction and reproduce information.
一方、磁束感知型の磁気ヘッドは、ヘッド基板上に磁気
抵抗効果素子を薄膜状に形成した薄膜型のものであり、
磁束変化で上記磁気抵抗効果素子の抵抗値が変化し、こ
の変化に比例した電圧変化により情報再生が行われる。On the other hand, a magnetic flux sensing type magnetic head is a thin film type in which a magnetoresistive element is formed in a thin film shape on a head substrate.
The resistance value of the magnetoresistive element changes due to a change in magnetic flux, and information is reproduced by a voltage change proportional to this change.
ところで、上記磁気ヘッドによる磁気記録では、磁気記
録媒体の記録面での線記録密度とトラック密度との両者
の向上を図ることにより高記録密度化が要望されている
。しかしながら、前述した電磁誘導型及び磁束感知型の
再磁気ヘッドでは、その構造上、線記録密度とトラック
密度の両者を共に向上させることは困難であった。特に
、磁束感知型の磁気ヘッドは、磁気抵抗効果素子を使用
してその抵抗値の変化を検出する動作原理なので、磁気
抵抗効果素子が適切な範囲の抵抗値を有することが必要
であるために、磁気抵抗効果素子のトランク幅を小さく
することができず、換言すれば磁気記録媒体の記録面で
のトランク密度を上げることができなかった。Incidentally, in magnetic recording using the magnetic head, there is a demand for higher recording density by improving both the linear recording density and track density on the recording surface of the magnetic recording medium. However, in the electromagnetic induction type and magnetic flux sensing type remagnetization heads described above, it has been difficult to improve both the linear recording density and the track density due to their structures. In particular, since the operating principle of a magnetic flux sensing type magnetic head is to detect changes in its resistance value using a magnetoresistive element, it is necessary for the magnetoresistive element to have a resistance value within an appropriate range. However, it has not been possible to reduce the trunk width of the magnetoresistive element, or in other words, it has not been possible to increase the trunk density on the recording surface of the magnetic recording medium.
そこで、本発明は上記問題点に鑑みて提案するもので、
その目的とするところは、簡便な手段にて線記録密度と
トラック密度の両者の向上を実現可能にした磁気ヘッド
を提供することにある。Therefore, the present invention is proposed in view of the above problems.
The objective is to provide a magnetic head that can improve both linear recording density and track density using simple means.
本発明における上記目的を達成するための技術的手段は
、磁気記録媒体の記録面に対して近接配置させる強磁性
体薄膜で、上記磁気記録媒体の記録面に書込まれた信号
磁界の変化ががスポット光の照射による光磁気効果で読
出される高透磁率の強磁性体薄膜を具備し、更に強磁性
体薄膜の膜面に対して、信号磁界の変化を光磁気効果で
読出すためのスポット光を導出入する光導波路を設けた
点である。The technical means for achieving the above object of the present invention is a ferromagnetic thin film disposed close to the recording surface of the magnetic recording medium, so that changes in the signal magnetic field written on the recording surface of the magnetic recording medium are prevented. is equipped with a ferromagnetic thin film of high magnetic permeability that can be read out using the magneto-optical effect when irradiated with spot light, and further has a ferromagnetic thin film with high magnetic permeability that can be read out using the magneto-optical effect when the change in the signal magnetic field is read out with respect to the film surface of the ferromagnetic thin film. The point is that an optical waveguide is provided to introduce and output the spot light.
本発明の磁気ヘッドでは、磁気記録媒体の記録面に対し
て近接配置した高透磁率の強磁性体薄膜に上記記録面の
信号磁界変化が伝搬される。次に上記薄膜上にスポット
光を照射することにより、＊ｍが有する光磁気効果でｌ
ｌ膜から出るスポット光の偏波面が、信号磁界変化に応
じて回転し、この回転によるスポット光の偏向角度で信
号磁界変化を検出して情報の再生を行う。この情報再生
では、上記薄膜の膜厚を可及的に小さくすることにより
線記録密度の向上が図れると共に、その薄膜にスポット
光を照射して信号磁界を検出するのでｌ−ラック密度の
向上も図れる。In the magnetic head of the present invention, changes in the signal magnetic field on the recording surface of the magnetic recording medium are propagated to a high permeability ferromagnetic thin film disposed close to the recording surface. Next, by irradiating a spot light onto the above thin film, l
The plane of polarization of the spot light emitted from the L film rotates in response to changes in the signal magnetic field, and information is reproduced by detecting changes in the signal magnetic field based on the deflection angle of the spot light due to this rotation. In this information reproduction, the linear recording density can be improved by reducing the thickness of the thin film as much as possible, and since the signal magnetic field is detected by irradiating the thin film with a spot light, the l-rack density can also be improved. I can figure it out.
本発明に係る磁気ヘッドの一実施例を第１図乃至第７図
を参照しながら説明する。An embodiment of the magnetic head according to the present invention will be described with reference to FIGS. 1 to 7.
第１図乃至第３図に示す磁気ヘッド（１）において、（
２）はサファイア、即ち、単結晶の１１ｚ２０３等の非
磁性体材料にてなるヘッド基板、（３）は上記ヘッド基
板（２）上に蒸着或いはスパッタリングにより被着形成
された強磁性体薄膜で、ＦｅＣｏやＦｅＧｄ等の光磁気
効果（後述）を有する高透磁率の強磁性体から構成され
る。In the magnetic head (1) shown in FIGS. 1 to 3, (
2) is a head substrate made of a non-magnetic material such as sapphire, that is, single crystal 11z203; (3) is a ferromagnetic thin film formed on the head substrate (2) by vapor deposition or sputtering; It is made of a high magnetic permeability ferromagnetic material having a magneto-optical effect (described later), such as FeCo or FeGd.
（４）（５）は上記ｌｌ膜（３）の両側及び上面に被着
形成された光透過性を有する非磁性体材料からなる先導
波路で、一方の先導波路（４）から導入されるスポット
光りをＩＥｙ（３）上に反射するミラー面（６）と、上
記スポット光りにより薄膜（３）で反射されたスポット
Ｌ″を他方の光導波路（５）に導出するミラー面（７）
とを画先導波路（４）（５）の先端の薄膜（３）両側方
に形成する。（８）は図中鎖線で示すように上記ヘッド
基板（３）と同様、サファイアやセラミック等の非磁性
体材料からなる保護板である。(4) and (5) are guiding waveguides made of a non-magnetic material having optical transparency and deposited on both sides and the upper surface of the ll film (3), and a spot introduced from one of the guiding waveguides (4). A mirror surface (6) that reflects light onto IEy (3), and a mirror surface (7) that guides the spot L'' reflected by the thin film (3) by the spot light to the other optical waveguide (5).
are formed on both sides of the thin film (3) at the tips of the image guide waveguides (4) and (5). As shown by the chain line in the figure, (8) is a protective plate made of a non-magnetic material such as sapphire or ceramic, like the head substrate (3).
第１図乃至第３図に示す上記磁気ヘッド（１）による情
報再生を第４図乃至第７図に示し説明する。尚、第４図
乃至第７図では、説明の都合上磁気ヘッド（１）の薄膜
（３）のみを示し他の構成部材については省略する。Information reproduction by the magnetic head (1) shown in FIGS. 1 to 3 will be described with reference to FIGS. 4 to 7. 4 to 7, for convenience of explanation, only the thin film (3) of the magnetic head (1) is shown and other constituent members are omitted.
まず、磁気テープや磁気ディスク等の磁気記録媒体（９
）の記録面（９ａ）に対してｌｌ膜（３）を近接させた
状態で直立配置し、この状態で上記磁気記録媒体（９）
を図中Ａ矢印方向に走行させる。これにより磁気記録媒
体（９）の記録面（９ａ）に書込まれた信号磁界変化が
高透磁率を有する薄膜（３）に伝搬される。この時、光
源 （図示せず）から照射されたスポット光りを光導波
路（４）を介して薄膜（３）上に導き、入射させする（
第１図乃至第３図参照）。即ち、上記光導波路（４）内
を全反射しながら進むスポット光りは、ミラー面（６）
で反射され、ｌｌ膜（３）の膜面上に入射し、その膜面
で反射する。この時、上記溝ＩＩＩ （３）が有する光
磁気効果の一つであるカー効果により、薄膜（３）上に
照射されたスポット光Ｉ、の偏波面が磁気記録媒体（９
）から伝搬された信号磁界変化に応じて回転する。この
偏波面の回転により偏向した状態で薄膜（３）で反射し
たスポット光りは、光導波路 （５）を介して導出され
る。即ち、膜面で反射したスポット光Ｌ゛は、ミラー面
（７）で反射し、光導波路（５）内を全反射しながら進
み、光検知手段（図示せずンに達する。この光検知手段
により上記スポット光Ｌ゛の偏向角度で信号磁界変化を
検出して情報の再生が行われる。First, magnetic recording media such as magnetic tapes and magnetic disks (9
) The ll film (3) is placed upright in close proximity to the recording surface (9a) of the magnetic recording medium (9).
is run in the direction of arrow A in the figure. As a result, changes in the signal magnetic field written on the recording surface (9a) of the magnetic recording medium (9) are propagated to the thin film (3) having high magnetic permeability. At this time, spot light emitted from a light source (not shown) is guided onto the thin film (3) via the optical waveguide (4) and made incident (
(See Figures 1 to 3). In other words, the spot light traveling through the optical waveguide (4) while being totally reflected is reflected by the mirror surface (6).
The light is reflected by the ll film (3), and is incident on the film surface of the ll film (3), where it is reflected. At this time, due to the Kerr effect, which is one of the magneto-optical effects of the groove III (3), the polarization plane of the spot light I irradiated onto the thin film (3) changes to the magnetic recording medium (9).
) rotates in response to changes in the signal magnetic field propagated from. The spot light reflected by the thin film (3) in a polarized state due to the rotation of the polarization plane is led out via the optical waveguide (5). That is, the spot light L' reflected on the film surface is reflected on the mirror surface (7), travels through the optical waveguide (5) while being totally reflected, and reaches the light detection means (not shown). Information is reproduced by detecting changes in the signal magnetic field at the deflection angle of the spot light L'.
上記磁気ヘッド（１）による情報再生では、薄膜（３）
の膜厚ｄを可及的に小さくすることにより線記録密度の
向上が図れ、例えば上記線記録密度を０．１ μ程度に
まで高密度化することが可能となる。而も、この線記録
密度の向上と共に、上記薄膜（３）にスポット光りを照
射して信号磁界変化を読出すので、上記薄膜（３）のト
ランク幅ｔにかかわりなく、トラック密度の向上も図れ
、例えばスポット光りのスポット径を小さくすることに
より、上記トラック密度を１μ程度にまで高密度化する
ことが可能となる。更に、上記信号磁界変化の読出しで
は、スポット光Ｌ°を検出することにより行われるので
、その検出感度が低下することがなく、良好な情報再生
が実現容易である。When reproducing information using the magnetic head (1), the thin film (3)
By making the film thickness d as small as possible, the linear recording density can be improved, and for example, the linear recording density can be increased to about 0.1 μm. In addition to this improvement in linear recording density, the track density can also be improved regardless of the trunk width t of the thin film (3) since the thin film (3) is irradiated with a spot light to read out changes in the signal magnetic field. For example, by reducing the spot diameter of the spot light, it is possible to increase the track density to about 1 μm. Furthermore, since the above-mentioned signal magnetic field change is read out by detecting the spot light L°, the detection sensitivity does not decrease, and good information reproduction can be easily achieved.
上記磁気ヘッド（１）では、第２図に示すように、ＷＩ
ｊ膜（３）が媒体摺接面（１０）から長さＥを有するの
で、上記媒体摺接面（１０）が摩耗した場合、薄膜（３
）上に照射されるスポット光りの照射ポイン）Ｐを、光
導波路（４）に導入するスポット光りを位置修正して薄
膜（３）の長さｌに沿う方向に変更すれば、媒体摺接面
（１０）の摩耗対策が図れる。In the magnetic head (1), as shown in FIG.
Since the film (3) has a length E from the medium sliding contact surface (10), if the medium sliding contact surface (10) is worn out, the thin film (3)
) If the position of the spot light introduced into the optical waveguide (4) is changed to the direction along the length l of the thin film (3), the medium sliding contact surface (10) Measures against wear can be taken.
尚、上記実施例では、スポット光りをＳ膜（３）で反射
させる場合に生じるカー効果について説明したが、本発
明はこれに限定されることなく、スポ７）光りを＋ｉ膜
（３）で透過させる際に生じるファラデー効果を利用す
ることも可能である。In the above embodiment, the Kerr effect that occurs when spot light is reflected by the S film (3) has been explained, but the present invention is not limited thereto. It is also possible to utilize the Faraday effect that occurs during transmission.
また、上記実施例では、磁気ヘッド（１）による情報再
生について説明したが、本発明の磁気ヘッド（１）は、
図示しないがヘッド基板（２）及び保護板（８）の外周
にＣｕ等の線材を巻回してコイルを形成すれば、記録用
としても使用することが可能である。而も、記録時には
上記コイルによる磁界を、集束させ、しかも再生時には
スポット光り、Ｌ’ を利用するため、相互に干渉する
ことはなく、コンピュータ用ストリーミング装置等に使
用される記録及び再生同時用でより高密度記録が望まし
い磁気ヘッドとしても通用可能である。Further, in the above embodiment, information reproduction by the magnetic head (1) was explained, but the magnetic head (1) of the present invention
Although not shown, if a coil made of Cu or the like is wound around the outer periphery of the head substrate (2) and the protection plate (8), it can also be used for recording purposes. Furthermore, since the magnetic field from the above coil is focused during recording and uses a spot light L' during playback, there is no mutual interference, and it is suitable for simultaneous recording and playback used in computer streaming devices, etc. It can also be used as a magnetic head where higher density recording is desirable.
本発明によれば、磁気記録媒体から薄膜に伝搬された信
号磁界変化を、薄膜が有する光磁気効果でスポット光に
より検出して情報を読出すようにしたから、線記録密度
とトランク密度との両者の向上が図れて高記録密度化が
実現容易となり、而も、感度低下を招くこともなく、良
好な情報再生が可能な実用的価値大なる磁気ヘッドを提
供できる。According to the present invention, information is read by detecting changes in the signal magnetic field propagated from the magnetic recording medium to the thin film using a spot light using the magneto-optical effect of the thin film. By improving both, it becomes easy to achieve high recording density, and it is possible to provide a magnetic head with great practical value that can reproduce information favorably without causing a decrease in sensitivity.
第１図は本発明に係る磁気ヘッドの一実施例を示す斜視
図、第２図は第１図の平面図、第３図は第１図の正面図
である。第４図は磁気ヘッドの薄膜及び磁気記録媒体を
示す斜視図、第５図は第４図の側面図、第６図は第４図
の正面図、第７図は第４図の平面図である。
（１）−・磁気ヘッド、
（３）−・強磁性体ｖＩ＃膜、
（４）（５）・−光導波路、
（９） −磁気記録媒体、
（９Ｂ）−・−記録面、
Ｌ、Ｌ’−スポット光。1 is a perspective view showing an embodiment of a magnetic head according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a front view of FIG. 1. Fig. 4 is a perspective view showing the thin film of the magnetic head and the magnetic recording medium, Fig. 5 is a side view of Fig. 4, Fig. 6 is a front view of Fig. 4, and Fig. 7 is a plan view of Fig. 4. be. (1)--magnetic head, (3)--ferromagnetic vI# film, (4) (5)--optical waveguide, (9)--magnetic recording medium, (9B)--recording surface, L, L'-Spot light.
Claims (2)
体薄膜で、上記磁界記録媒体の記録面に書込まれた信号
磁界の変化がスポット光の照射による光磁気効果で読出
され、記録する際には、コイル等により磁界集束させる
高透磁率の強磁性体薄膜を具備したことを特徴とする磁
気ヘッド。(1) With a ferromagnetic thin film placed close to the recording surface of the magnetic recording medium, changes in the signal magnetic field written on the recording surface of the magnetic field recording medium are read out by the magneto-optical effect caused by spot light irradiation, and recorded. A magnetic head comprising a ferromagnetic thin film with high magnetic permeability that focuses a magnetic field using a coil or the like.
上記薄膜に転写された信号磁界を光磁気効果で読出すた
めのスポット光を導出入する光導波路を設けたことを特
徴とする請求項（１）記載の磁気ヘッド。(2) An optical waveguide is provided on the film surface of the ferromagnetic thin film for guiding and inputting a spot light for reading out the signal magnetic field transferred from the magnetic recording medium to the thin film using the magneto-optical effect. A magnetic head according to claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23737688A JPH0283838A (en) | 1988-09-20 | 1988-09-20 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23737688A JPH0283838A (en) | 1988-09-20 | 1988-09-20 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0283838A true JPH0283838A (en) | 1990-03-23 |
Family
ID=17014471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23737688A Pending JPH0283838A (en) | 1988-09-20 | 1988-09-20 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0283838A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60143463A (en) * | 1983-12-29 | 1985-07-29 | Fuji Photo Film Co Ltd | Method and device for reproducing magnetic recording information |
| JPS60224139A (en) * | 1984-04-20 | 1985-11-08 | Nippon Telegr & Teleph Corp <Ntt> | High-density magnetooptic playback head |
| JPS62177738A (en) * | 1986-01-30 | 1987-08-04 | Nec Home Electronics Ltd | Transfer type photomagnetic head |
-
1988
- 1988-09-20 JP JP23737688A patent/JPH0283838A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60143463A (en) * | 1983-12-29 | 1985-07-29 | Fuji Photo Film Co Ltd | Method and device for reproducing magnetic recording information |
| JPS60224139A (en) * | 1984-04-20 | 1985-11-08 | Nippon Telegr & Teleph Corp <Ntt> | High-density magnetooptic playback head |
| JPS62177738A (en) * | 1986-01-30 | 1987-08-04 | Nec Home Electronics Ltd | Transfer type photomagnetic head |
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