JP2685780B2 - Magnetic head for magneto-optical recording - Google Patents
Magnetic head for magneto-optical recordingInfo
- Publication number
- JP2685780B2 JP2685780B2 JP63036532A JP3653288A JP2685780B2 JP 2685780 B2 JP2685780 B2 JP 2685780B2 JP 63036532 A JP63036532 A JP 63036532A JP 3653288 A JP3653288 A JP 3653288A JP 2685780 B2 JP2685780 B2 JP 2685780B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- magnetic head
- magnetic
- magneto
- 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.)
- Expired - Lifetime
Links
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
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，磁界変調型の光磁気記録装置に使用する，
狭小領域へ磁界を印加するための磁気ヘッドに関するも
のである。The present invention relates to a magnetic field modulation type magneto-optical recording apparatus,
The present invention relates to a magnetic head for applying a magnetic field to a narrow area.
光磁気記録方式においては，光の波長と同程度の直
径，すなわち１μｍの光点にレーザ光を絞って記録する
ものであるため，極めて大きな記録容量を有し，通常一
般の磁気記録方式におけるよりも，記録密度が１〜２桁
高いという特徴がある。しかしながら当初の光磁気記録
方式においては，情報の書き替えにディスク２回転（消
去，記録各１回転）が必要であり，磁気記録においては
常識となっているオーバライト（重ね書き）ができない
ため，データ処理速度が遅くなり，用途が限定されてい
た。その後の研究開発により，近年に至って繰り返し記
録，新データの記録と旧データの消去が同時にできるも
のが出現するようになった。In the magneto-optical recording method, since the laser light is focused and recorded at a light spot having a diameter approximately equal to the wavelength of light, that is, 1 μm, it has an extremely large recording capacity, However, the recording density is high by 1 to 2 digits. However, in the original magneto-optical recording method, rewriting of information requires two rotations of the disk (one rotation each for erasing and recording), and overwriting (overwriting), which is common knowledge in magnetic recording, cannot be performed. The data processing speed has slowed down, limiting its use. In recent years, research and development have made it possible to repeatedly record data, record new data, and erase old data at the same time.
第７図は上記方式の一例を模式的に示す説明図であ
る。同図において１は光磁気ディスクであり、例えばガ
ラス基板11上に記録層12および保護層13を順に積層して
形成する。次に２は磁気ヘッドであり，非磁性材料から
なる板状のスライダ21の一端に，軟磁性材料からなる棒
状のコア22を固着し，コア22にコイル23を巻装して形成
する。上記の構成により，磁気ヘッド２を光磁気ディス
ク１上に保持すると共に，光磁気ディスク１を回転さ
せ，光磁気ディスク１の下方からレンズ３によって光点
を収束したレーザ光４を連続的に照射する一方，磁気ヘ
ッド２により記録すべきデータに対応する外部磁界を印
加して記録するのである。すなわち光磁気ディスク１に
設けた記録層12は，垂直磁化膜によって形成し，予め例
えば一様に上向きに磁化の向きを揃えておく。次にレー
ザ光４を透明材料からなる基板11を透過させて記録層12
に照射すると，キューリー温度近傍に昇温した場合に記
録層12の保磁力が減少し，磁気ヘッド２を形成するコイ
ル23を介してコア22に発生した下向きの磁界によって磁
化が反転するから，記録層12に情報若しくはデータを記
録することができるのである。FIG. 7 is an explanatory view schematically showing an example of the above method. In the figure, reference numeral 1 denotes a magneto-optical disk, which is formed by laminating a recording layer 12 and a protective layer 13 on a glass substrate 11 in order. Next, reference numeral 2 denotes a magnetic head, which is formed by fixing a rod-shaped core 22 made of a soft magnetic material to one end of a plate-shaped slider 21 made of a non-magnetic material, and winding a coil 23 around the core 22. With the above configuration, the magnetic head 2 is held on the magneto-optical disk 1, the magneto-optical disk 1 is rotated, and laser light 4 whose light spot is converged by a lens 3 is continuously irradiated from below the magneto-optical disk 1. On the other hand, an external magnetic field corresponding to the data to be recorded is applied by the magnetic head 2 for recording. That is, the recording layer 12 provided on the magneto-optical disk 1 is formed of a perpendicular magnetization film, and the direction of magnetization is, for example, uniformly and upwardly aligned in advance. Next, the laser light 4 is transmitted through the substrate 11 made of a transparent material to allow the recording layer 12
When the magnetic field is irradiated on the recording medium, the coercive force of the recording layer 12 decreases when the temperature rises near the Curie temperature, and the magnetization is reversed by the downward magnetic field generated in the core 22 via the coil 23 forming the magnetic head 2. Information or data can be recorded on the layer 12.
上記従来技術における磁気ヘッド２においては，コア
21が棒状であるため，閉磁路を構成していない。従って
漏洩磁束が多く，記録層12に作用する磁界が弱くなるた
め磁界発生効率が極めて低いという問題点がある。また
コア22の下端面から記録層12までの距離が長いため、記
録層12の磁化の向きを反転させるに足る磁界強度を確保
するためには、従来の磁気記録用の磁気ヘッドと比較し
てコイル23の巻数および記録電流を大にしなければなら
ない。しかしながら，コイル23の巻数を大にするとイン
ダクタンスが大となって，前記記録層12の磁化反転速度
が遅くなる。またコイル23への記録電流を大にすると，
コイル23の発熱量が大となるという問題点がある。In the magnetic head 2 according to the prior art, the core
Since 21 is rod-shaped, it does not form a closed magnetic circuit. Therefore, there is a problem that the leakage magnetic flux is large and the magnetic field acting on the recording layer 12 is weakened, so that the magnetic field generation efficiency is extremely low. Further, since the distance from the lower end surface of the core 22 to the recording layer 12 is long, in order to secure a magnetic field strength sufficient to reverse the magnetization direction of the recording layer 12, as compared with a conventional magnetic head for magnetic recording. The number of turns of the coil 23 and the recording current must be large. However, when the number of turns of the coil 23 is increased, the inductance is increased, and the magnetization reversal speed of the recording layer 12 is reduced. When the recording current to coil 23 is increased,
There is a problem that the calorific value of the coil 23 becomes large.
本発明は，上記従来技術に存在する問題点を解決し，
コイルの巻数および記録電流が小であっても，コアの効
率が高く，かつ記録層に所要の強度の磁界を作用させ得
る光磁気記録用磁気ヘッドを提供することを目的とす
る。The present invention solves the above-mentioned problems in the prior art,
An object of the present invention is to provide a magnetic head for magneto-optical recording in which the efficiency of a core is high and a magnetic field having a required strength can be applied to a recording layer even if the number of turns of a coil and a recording current are small.
上記の目的を達成するため，本発明においては、垂直
磁化膜を有する記録媒体を介してレーザ光照射源と対向
して配設すると共に，非磁性材料からなるスライダの端
部に軟磁性材料からなりかつコイルを巻装したコアを固
着して構成した光磁気記録用磁気ヘッドにおいて，コア
の前記記録媒体に臨む側の端面に高飽和磁束密度材料か
らなる厚さ0.2〜10μｍの薄膜を固着する，という技術
的手段を採用したのである。To achieve the above object, in the present invention, a recording medium having a perpendicular magnetization film is provided so as to be opposed to a laser light irradiation source, and a slider made of a nonmagnetic material is provided with a soft magnetic material at the end. In a magnetic head for magneto-optical recording, which is formed by fixing a core wound with a coil, a thin film made of a high saturation magnetic flux density material and having a thickness of 0.2 to 10 μm is fixed to the end face of the core facing the recording medium. We adopted the technical means of.
また上記コアを開放端部を有する実質的なＵ字型に形
成すると共に，コアの開放端部を前記記録媒体に臨ませ
て設け，何れか一方の開放端部からの磁界が前記垂直磁
化膜に作用するように構成すると効果的である。Further, the core is formed in a substantially U shape having an open end, and the open end of the core is provided so as to face the recording medium, and a magnetic field from either one of the open ends causes the perpendicular magnetization film. It is effective to configure it to act on.
上記の構成により，従来技術同様にレーザ光による記
録媒体の照射状態で，磁気ヘッドを形成するコイルを解
してコアに磁界を発生させることにより，記録媒体に情
報若しくはデータを記録することができるのである。With the above-mentioned structure, information or data can be recorded on the recording medium by releasing the coil forming the magnetic head and generating the magnetic field in the core under the irradiation state of the recording medium with the laser beam as in the prior art. Of.
第１図は本発明の実施例を示す要部斜視図であり，同
一部分は前記第７図と同一の参照符号で示す。第１図に
おいて磁気ヘッド２は，非磁性材料である例えばCaTiO3
によって板状に形成したスライダ21の一端に，軟磁性材
料であるMn-Znフェライトからなり,U字型に形成したコ
ア24をガラスからなる固着材25によって固着して形成す
る。なおコア24は，横断面寸法を0.2mm×0.2mm,開放端
部間の寸法を0.6mm,開放端部と閉鎖端部間の高さ寸法を
2.2mmに形成した。またコア24の開放端部には、後述す
る手段により、センダストからなる薄膜26bを固着す
る。FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention, and the same parts are designated by the same reference numerals as in FIG. In FIG. 1, a magnetic head 2 is made of a non-magnetic material such as CaTiO 3.
A U-shaped core 24 made of Mn-Zn ferrite, which is a soft magnetic material, is fixed to one end of a slider 21 formed in a plate shape by a fixing material 25 made of glass. The core 24 has a cross-sectional dimension of 0.2 mm × 0.2 mm, a dimension between the open ends of 0.6 mm, and a height dimension between the open and closed ends.
It was formed to 2.2 mm. A thin film 26b made of sendust is fixed to the open end of the core 24 by means described later.
第２図〜第６図は夫々本発明の実施例における磁気ヘ
ッド２の製造行程を示す要部斜視図であり、同一部分は
前記第１図と同一の参照符号で示す。まず第２図はコア
24の素材26を示す斜視図であり,Mn-Znフェライトからな
る幅1.0mm,高さ2.2mmの角柱形に形成した素材26に，セ
ンダスト9.6％Si-5.4％Al-Fe）からなる厚さ５μｍの薄
膜26bを，例えばスパッタによって固着する。上記の処
理後に素材26の薄膜26bの固着面に，例えば研削加工に
より幅0.6mm,深さ1.0mmの溝26aを設ける。次に上記素材
26を例えばスライサー等によって厚さ0.2mmに切断し
て，第３図に示すようなコア24を形成する。次にスライ
ダ21には,CaTiO3からなる幅3.9mm,高さ0.9mm,長さ5.7mm
の板状体の一端に溝27を設ける（第４図参照）。次に第
５図に示すように，前記コア24を溝27内に設置して開放
端部をスライダ21の表面と同一平面に保持した状態で，
第６図に示すように溝27内にガラスを溶融してなる固着
材25を充填してコア24を固着するのである。上記コア24
の固着後，スライダ21に浮上面の仕上加工その他の加工
を行なうと共に，コア24にコイル（図示せず）を巻装し
て前記第１図に示すような磁気ヘッド２を形成する。2 to 6 are perspective views of main parts showing the manufacturing process of the magnetic head 2 in the embodiment of the present invention, and the same parts are designated by the same reference numerals as those in FIG. Figure 2 shows the core
24 is a perspective view showing a material 26 of 24, in which a material 26 made of Mn-Zn ferrite and having a width of 1.0 mm and a height of 2.2 mm is formed into a prismatic shape, and a thickness of sendust 9.6% Si-5.4% Al-Fe) The 5 μm thin film 26b is fixed by, for example, sputtering. After the above processing, a groove 26a having a width of 0.6 mm and a depth of 1.0 mm is provided on the surface of the material 26 on which the thin film 26b is fixed by, for example, grinding. Then the above material
26 is cut into a thickness of 0.2 mm by using a slicer or the like to form a core 24 as shown in FIG. Next, the slider 21 was made of CaTiO 3 and had a width of 3.9 mm, a height of 0.9 mm, and a length of 5.7 mm.
A groove 27 is provided at one end of the plate-like body (see FIG. 4). Next, as shown in FIG. 5, with the core 24 installed in the groove 27 and the open end being held flush with the surface of the slider 21,
As shown in FIG. 6, the core 24 is fixed by filling the groove 27 with the fixing material 25 obtained by melting glass. Above core 24
After the fixing, the slider 21 is subjected to finishing processing and other processing of the air bearing surface, and a coil (not shown) is wound around the core 24 to form the magnetic head 2 as shown in FIG.
上記のように構成した磁気ヘッド２の磁界強度を測定
したところ470〜530Oeを示した。なおコア24の開放端部
に薄膜26bを固着しないものについての磁界強度は350Oe
に留まり，薄膜26bの固着により，磁界強度が約50％向
上することが確認された。上記測定においては、コア24
に線径0.035mmの導線を30回巻回したものを使用した。When the magnetic field strength of the magnetic head 2 configured as described above was measured, it showed 470 to 530 Oe. The magnetic field strength of the core 24 without the thin film 26b fixed to the open end is 350 Oe.
It was confirmed that the magnetic field strength was improved by about 50% due to the adhesion of the thin film 26b. In the above measurement, the core 24
A conductor wire with a wire diameter of 0.035 mm was wound around 30 times.
本実施例においては，薄膜を形成する材料としてセン
ダストを使用した例を示したが，センダスト以外にパー
マロイ，アモルファス材料Fe−Ｃ若しくはFe-Rh等の鉄
系軟磁性合金等の高飽和磁束密度材料を使用することが
できる。また薄膜の固着手段としては，スパッタ法以外
に蒸着法，イオンプレーティング,PVD法,CVD法等の薄膜
形成固着手法を使用することができる。なお薄膜の厚さ
が0.2μｍ未満では，磁界強度を向上させる作用が期待
できないため不都合である。一方薄膜の厚さが大である
とその成膜に要する時間が大となるため,0.2〜10μｍと
するのが好ましい。またスライダおよびコアを形成する
材料として各々CaTiO3およびMn-Znフェライトを使用し
た例を示したが，各々他の非磁性材料および他の軟磁性
材料を使用してもよい。次にコアの形状としてＵ字型若
しくはコ字型の例を示したが，必ずしもこれに限定され
ず，記録媒体と対向すルコア端部に薄膜を形成固着し得
るものであればよく，従って従来形状である棒状のコア
であってもよい。またコアの寸法としては必ずしも本実
施例に示すものに限定されず，記録媒体のトラック幅，
使用周波数，再生出力その他を勘案して他の寸法のもの
を適宜選定できることは勿論である。In the present embodiment, an example in which sendust is used as a material for forming a thin film is shown. However, in addition to sendust, a high saturation magnetic flux density material such as permalloy, an amorphous material such as an iron-based soft magnetic alloy such as Fe-C or Fe-Rh is used. Can be used. In addition to the sputtering method, a thin film forming and fixing method such as a vapor deposition method, an ion plating method, a PVD method, or a CVD method can be used as a method for fixing the thin film. If the thickness of the thin film is less than 0.2 μm, the effect of improving the magnetic field strength cannot be expected, which is inconvenient. On the other hand, if the thickness of the thin film is large, it takes a long time to form the film, so 0.2 to 10 μm is preferable. In addition, although examples of using CaTiO 3 and Mn-Zn ferrite as materials for forming the slider and the core are shown, other non-magnetic materials and other soft magnetic materials may be used, respectively. Next, an example of a U-shape or a U-shape was shown as the shape of the core. However, the shape of the core is not limited to this, and any shape can be used as long as a thin film can be formed and fixed to the end of the core that faces the recording medium. The shape may be a rod-shaped core. Further, the dimensions of the core are not necessarily limited to those shown in this embodiment, and the track width of the recording medium,
Of course, other dimensions can be selected as appropriate in consideration of the used frequency, the reproduction output, and so on.
本発明は，以上記述のような構成および作用であるか
ら，下記の効果を期待し得る。Since the present invention has the configuration and operation as described above, the following effects can be expected.
（１） コアの端面に高飽和磁束密度材料からなる薄膜
を固着したものであるから，漏洩磁束が極めて大であ
り，記録媒体に作用する磁界を増大させ得るため，効率
を大幅に増大させることができる。(1) Since a thin film made of a high saturation magnetic flux density material is fixed to the end surface of the core, the leakage magnetic flux is extremely large, and the magnetic field acting on the recording medium can be increased, so that the efficiency is greatly increased. You can
（２） 上記（１）と関連して，コイルの巻数を低減す
ることができ，加工組立工数を大幅に低減させ得る。(2) In connection with the above (1), the number of turns of the coil can be reduced, and the number of processing and assembling steps can be significantly reduced.
（３） コイルの巻数が少なくて済むためインダクタン
スを小とすることができ，コアにおける磁極の磁化反転
が速くなり，この結果記録媒体を構成する垂直磁化膜に
おける磁化反転速度を大幅に増大させ得る。(3) Since the number of turns of the coil is small, the inductance can be reduced, and the magnetization reversal of the magnetic pole in the core becomes faster. As a result, the magnetization reversal speed in the perpendicular magnetization film constituting the recording medium can be greatly increased. .
（４） コイルの巻数が小であると共に，効率が大であ
るため，記録に要する磁化電流が小であり，コイルの発
熱を防止することができる。(4) Since the number of turns of the coil is small and the efficiency is high, the magnetizing current required for recording is small, and heat generation of the coil can be prevented.
第１図は本発明の実施例を示す要部斜視図，第２図〜第
６図は夫々本発明の実施例における磁気ヘッドの製造行
程を示す要部斜視図，第７図は本発明の対象である光磁
気記録方式の一例を模式的に示す説明図である。 2:磁気ヘッド,21:スライダ,24:コア,23:コイル,26b:薄
膜。1 is a perspective view of an essential part showing an embodiment of the present invention, FIGS. 2 to 6 are perspective views of an essential part showing a manufacturing process of a magnetic head in an embodiment of the present invention, and FIG. It is explanatory drawing which shows typically an example of the target magneto-optical recording system. 2: Magnetic head, 21: Slider, 24: Core, 23: Coil, 26b: Thin film.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西山 俊一 埼玉県熊谷市三ヶ尻5200番地 日立金属 株式会社磁性材料研究所内 (72)発明者 篠原 肇 埼玉県熊谷市三ヶ尻5200番地 日立金属 株式会社磁性材料研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunichi Nishiyama 5200 Mikkaji, Kumagaya City, Saitama, Hitachi Metals Co., Ltd. Magnetic Materials Research Center (72) Hajime Shinohara 5200 Mikkaji, Kumagaya, Saitama Hitachi Metals Research Co., Ltd. In-house
Claims (2)
ザ光照射源と対向して配設すると共に、非磁性材料から
なるスライダの端部に軟磁性材料からなりかつコイルを
巻装したコアを固着して構成した光磁気記録用磁気ヘッ
ドにおいて、コアの前記記録媒体に臨む側の端面に高飽
和磁束密度材料からなる厚さ0.2〜10μｍの薄膜を固着
したことを特徴とする光磁気記録用磁気ヘッド。1. A core, which is arranged so as to face a laser beam irradiation source through a recording medium which swings a perpendicularly magnetized film, and which is made of a soft magnetic material and has a coil wound around an end of a slider made of a nonmagnetic material. In a magnetic head for magneto-optical recording, the core is fixed with a thin film having a thickness of 0.2 to 10 μm made of a high saturation magnetic flux density material, which is fixed to the end face of the core facing the recording medium. Magnetic head.
形成すると共に、コアの開放端部を前記記録媒体に臨ま
せて設け、何れか一方の開放端部からの磁界が前記垂直
磁化膜に作用するように構成した請求項１記載の光磁気
記録用磁気ヘッド。2. A core is formed in a substantially U-shape having an open end, and the open end of the core is provided so as to face the recording medium, and a magnetic field from any one of the open ends is the above-mentioned. The magnetic head for magneto-optical recording according to claim 1, wherein the magnetic head acts on the perpendicular magnetization film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63036532A JP2685780B2 (en) | 1988-02-19 | 1988-02-19 | Magnetic head for magneto-optical recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63036532A JP2685780B2 (en) | 1988-02-19 | 1988-02-19 | Magnetic head for magneto-optical recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01211302A JPH01211302A (en) | 1989-08-24 |
| JP2685780B2 true JP2685780B2 (en) | 1997-12-03 |
Family
ID=12472396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63036532A Expired - Lifetime JP2685780B2 (en) | 1988-02-19 | 1988-02-19 | Magnetic head for magneto-optical recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2685780B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58118026A (en) * | 1981-12-29 | 1983-07-13 | Fujitsu Ltd | Optical magnetic head |
| JPS6139251A (en) * | 1984-07-27 | 1986-02-25 | Sony Corp | Magnetic recording optical reproducing device |
| JPS632216B2 (en) * | 1981-11-18 | 1988-01-18 | Dow Chemical Co |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58173023U (en) * | 1982-05-17 | 1983-11-18 | 富士電気化学株式会社 | Narrow track composite digital magnetic head |
| JPS632216U (en) * | 1986-06-19 | 1988-01-08 |
-
1988
- 1988-02-19 JP JP63036532A patent/JP2685780B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632216B2 (en) * | 1981-11-18 | 1988-01-18 | Dow Chemical Co | |
| JPS58118026A (en) * | 1981-12-29 | 1983-07-13 | Fujitsu Ltd | Optical magnetic head |
| JPS6139251A (en) * | 1984-07-27 | 1986-02-25 | Sony Corp | Magnetic recording optical reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01211302A (en) | 1989-08-24 |
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