JPS5996713A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5996713A JPS5996713A JP57206035A JP20603582A JPS5996713A JP S5996713 A JPS5996713 A JP S5996713A JP 57206035 A JP57206035 A JP 57206035A JP 20603582 A JP20603582 A JP 20603582A JP S5996713 A JPS5996713 A JP S5996713A
- Authority
- JP
- Japan
- Prior art keywords
- film
- copper
- coercive force
- recording medium
- magnetic 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 15
- 239000010949 copper Substances 0.000 claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 230000005415 magnetization Effects 0.000 claims abstract description 5
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000004544 sputter deposition Methods 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract description 3
- 229910002549 Fe–Cu Inorganic materials 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 15
- 239000010409 thin film Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000005300 metallic glass Substances 0.000 description 2
- 241000282994 Cervidae Species 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 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
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
- G11B11/10589—Details
- G11B11/10593—Details for improving read-out properties, e.g. polarisation of light
Landscapes
- Thin Magnetic Films (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は磁気的情報′ｔ−磁気光学的に読取るのに適し
た磁気記録媒体に関する。Description: TECHNICAL FIELD The present invention relates to a magnetic recording medium suitable for magneto-optically reading magnetic information.
従来技術
従来、磁気光学ディスク、磁気バブルメモリーなどに用
いらｎる膜面と垂直な方向に磁化容易軸を有する強磁性
薄膜としてはＭｎＢ１に代表さ扛る多結晶金属薄膜、Ｇ
ｃｌ−Ｃｏ％Ｇｄ−Ｆｅの非晶質金属薄膜、ＧＩＧに代
表される化付物単結晶薄膜が知らｔている。こｎらの薄
膜は種々の利点を有するが、ＭｎＢ１はキューリ一点が
高いために薄膜の作製が技術的に困難であシ％また磁気
光学ディスクに利用した場合書き込みに大きなエネルギ
ーを必要とするという欠点がある＠まｆＣｓ（）ｄ 、
−Ｏｏ％Ｇｄ−Ｆｅの非晶質金属薄膜は室温における保
磁力が小さく（３００〜５０００ｅ）記録さ扛た情報が
不安定であるという欠点を有している。Prior Art Conventionally, as a ferromagnetic thin film having an axis of easy magnetization in the direction perpendicular to the film plane used in magneto-optical disks, magnetic bubble memories, etc., polycrystalline metal thin films such as MnB1, G
Amorphous metal thin films of Cl-Co%Gd-Fe and compound single crystal thin films typified by GIG are known. Although these thin films have various advantages, MnB1 has a high Curie point, making it technically difficult to fabricate thin films.Also, when used in magneto-optical disks, it requires a large amount of energy to write. There is a drawback @mafCs()d,
An amorphous metal thin film of -Oo%Gd-Fe has a drawback in that the coercive force at room temperature is small (300 to 5000e) and recorded information is unstable.
そこで、上記のような従来の磁性薄膜記録媒体の欠点金
除去する新しい磁性薄膜記録媒体としてＴｂ−Ｆｅ膜を
使用することが提案さｎている（例えば、特開昭５２−
３１７０３号公報参照）。Therefore, it has been proposed to use a Tb-Fe film as a new magnetic thin film recording medium that eliminates the drawbacks of conventional magnetic thin film recording media as described above (for example, in
(See Publication No. 31703).
Ｔｂ−Ｆｅ膜を含む磁気記録媒体は膜面と垂直な方向に
磁化容易、軸を有するため高密度の情報記憶が可能であ
シかつ室温において数ＫＯ９の大きな保磁力を有するた
め記憶さｎた情報が極めて安定であるなどの釉々の利点
を有するものである。A magnetic recording medium containing a Tb-Fe film is easily magnetized in the direction perpendicular to the film surface, and because it has an axis, it is possible to store high-density information, and it has a large coercive force of several KO9 at room temperature, so it is difficult to store information. It has many advantages such as extremely stable information.
しかしながら、磁気光学効果を用いて読出しを行なうと
すると反射タイプの場合はカー回転角が大きいことが必
要となるがＴｂ−Ｆｅ膜ではカー回転角が０．１５ ｃ
ｌθｇと小さく問題である。However, if reading is to be performed using the magneto-optic effect, a large Kerr rotation angle is required in the case of a reflective type, but the Kerr rotation angle is 0.15 c in the case of a Tb-Fe film.
This is a problem because lθg is small.
目 的
本発明は上記問題に鑑みてなさ几たものであシ、その目
的は保磁力が大きくかつカー回転角の大きい磁気記録媒
体を提供することにある。Purpose The present invention was devised in view of the above problems, and its purpose is to provide a magnetic recording medium having a large coercive force and a large Kerr rotation angle.
構成
上記目的を達成するために、本発明の磁気記録媒体は膜
面と垂直な方向に磁化容易軸を有するＴｂ−Ｆｅ膜に少
なくとも０．５＃子％の銅を含むものである。本発明に
おいて銅の含有液を少なくとも０．５原子％と限定する
のは、大きなカー回転角を得るためであ５．ｏ、ｓ原子
％未満では充分なカー回転角が得らｎず本発明の効果が
達成さｆない。一方、銅の含有せをあまシ大きくすると
保磁力（Ｈｃ ）が小さくなシすぎてカー回転角（θｋ
）も小さくなるので０．５〜２０原子％の範囲が好まし
い。Structure In order to achieve the above object, the magnetic recording medium of the present invention contains at least 0.5 #% of copper in a Tb--Fe film having an axis of easy magnetization in a direction perpendicular to the film surface. In the present invention, the reason why the copper-containing liquid is limited to at least 0.5 atomic % is to obtain a large Kerr rotation angle5. If the amount is less than atomic percent o or s, a sufficient Kerr rotation angle will not be obtained and the effects of the present invention will not be achieved. On the other hand, if the copper content is slightly increased, the coercive force (Hc) becomes too small and the Kerr rotation angle (θk
) is also small, so a range of 0.5 to 20 atomic % is preferable.
本発明の磁気記録媒体を磁気光学ディスクに用いるとき
の一例を以下に説明する。ガラス、プラスチック、セラ
ミックなどからなる非磁性基板上に、スパッタ法、蒸着
法、イオンブレーティング法などによシ、少なくとも０
．５原子％の銅を含むＴｂ−Ｆｅ−０ｕ膜を形成させる
ことによシ作製する。Ｔｂ −Ｆｅ−Ｃｕ膜の作製はス
パッタ法によって行うのが望ましい。ターゲットはコン
ポジット法を用い、Ｆｅ円板の上にＴｂおよびＯｕチッ
プをのせて構成しそして組成はターゲット表面の面積比
でコントロールする。Ｔｂ−Ｆｅ膜の場合、第１図に示
すように、保磁力Ｈｃの大きい組成範囲はＴ’ｂが１５
〜３２原子％のときであシ、そして補償組成はおよそ２
１原子％Ｔｂの付近にある。An example of using the magnetic recording medium of the present invention in a magneto-optical disk will be described below. On a non-magnetic substrate made of glass, plastic, ceramic, etc., at least zero
．． It is manufactured by forming a Tb-Fe-0u film containing 5 at % copper. Preferably, the Tb-Fe-Cu film is manufactured by sputtering. The target is constructed using a composite method, with Tb and Ou chips placed on an Fe disk, and the composition is controlled by the area ratio of the target surface. In the case of a Tb-Fe film, as shown in Figure 1, the composition range where the coercive force Hc is large is when T'b is 15
~32 atom%, and the compensation composition is approximately 2
It is around 1 atom% Tb.
実施例
１つの実施態様として、本発明の磁気記録媒体をＴｂ−
Ｆｅ膜中のＴｌ）の一部をＣｕで置換してすなわち組成
式Ｆｅｏ７９（Ｔｂ１−ＸＣ’ｕＸ）０．２１で表わさ
ｎるＦｅ−Ｔｂ−０ｕ膜中のＸを変化して膜を形成する
ことによシ作製した。膜の評価はλ＝６３３ｎｍでのカ
ー回転角θにおよび保磁力Ｈａを求めて行なった。Example As one embodiment, the magnetic recording medium of the present invention is
A film is formed by replacing part of Tl) in the Fe film with Cu, that is, by changing X in the Fe-Tb-0u film represented by the compositional formula Feo79(Tb1-XC'uX)0.21. In particular, I made it. The film was evaluated by determining the Kerr rotation angle θ at λ=633 nm and the coercive force Ha.
残留ガス圧： ７ Ｘ １０−７ＴｏｒｒＡｒ ガス
圧： ２Ｘ １０−２Ｔｏｒｒ放電々力 ：４００Ｗ
プレスパツタ時間：６０分
メインスパッタ時間： １０分
上記のスパッタ条件でスライドガラス基板上に約＋ｚ２
ｏ、ｏＸ厚の’［’ｂ−Ｆｅ−ｃｕ膜を作製し、基板側
からＨｅ、−Ｎｅレーザー（λ−＝−ｓｓｓｎｍ）’ｔ
＝照ｇｔしてカー効果によりカー回転角θにおよび保磁
力Ｈｃｉ求めた。Residual gas pressure: 7 x 10-7 TorrAr Gas pressure: 2 x 10-2 Torr Discharge power: 400 W Press sputtering time: 60 minutes Main sputtering time: 10 minutes Approximately +z2 on the slide glass substrate under the above sputtering conditions
A '['b-Fe-cu film with o, oX thickness was prepared, and He, -Ne laser (λ-=-sssnm)'t was applied from the substrate side.
= gt, and the Kerr rotation angle θ and coercive force Hci were determined by the Kerr effect.
Ｏｕの添７ＪＯ量に対するカー回転角θにおよび保磁力
Ｈｅの変化は第２図に示したようになる。The changes in the Kerr rotation angle θ and the coercive force He with respect to the amount of O added 7JO are as shown in FIG.
この図から、Ｃｕの添加量を増加していくとＨａは小さ
くなるがθｋが大きくなることがわかる。From this figure, it can be seen that as the amount of Cu added increases, Ha decreases but θk increases.
本例ではＴ’ｂをＣｕで置換していったためＣｕを増す
と異方性に寄与しているＴ’ｂが減ｔ） 、Ｈｃは急激
に小さくなることからθにもＸ＝０．１７位から急激に
小さくなった。そのため、Ｏｕ！７）添加量をそ扛程上
げらｔなかったが、Ｔｂｏ量とＦｅの量の比を一定にし
てそ扛にＯｕを添加することを行えばＨａの急激な減少
はな（Ｏｕの添加量を多くできる。In this example, T'b was replaced with Cu, so when Cu is increased, T'b, which contributes to anisotropy, decreases (t), and since Hc decreases rapidly, θ also has X=0.17. It suddenly decreased from 1. Therefore, Ou! 7) Although the amount added was not increased that much, if O was added to the layer while keeping the ratio of Tbo and Fe constant, there would be no rapid decrease in Ha (the amount of O added). You can do a lot of things.
実際にθにの比較を行なったところ、
Ｆｅ Ｏ，７９Ｔｂ Ｏ，２１θに＝０．１６ａｅｇＦ
ｅｏ７９（Ｔｂｏ、９６０ｕｏ、ｏａ）ｏ、２１ θ
に＝０．２５ｄｅｇとなシカ−回転角θｋが（ｕｆ添加
することによシ５６％大きくなることが明らかである。When we actually compared θ, we found that Fe O, 79Tb O, 21 θ = 0.16 aegF
eo79(Tbo, 960uo, oa)o, 21 θ
It is clear that the deer rotation angle θk, which is 0.25 deg, increases by 56% by adding (uf).
効果
上述のように構成さｎた本発明の磁気記録媒体は保磁力
Ｈａが大きくかつカー回転角θにの大きい材料を提供す
ることができる。Effects The magnetic recording medium of the present invention constructed as described above can provide a material having a large coercive force Ha and a large Kerr rotation angle θ.
第１図はＴｂ含有量と保磁力（Ｈｅ）との相関関係を示
すグラフであシそして第２図は本発明の光磁気記録媒体
の組成変化に対するカー回転角の大きさくθｋ）と保磁
力（Ｈｅ）との関係を示すグラフである。Figure 1 is a graph showing the correlation between Tb content and coercive force (He), and Figure 2 is a graph showing the correlation between the Kerr rotation angle θk) and coercive force with respect to composition changes of the magneto-optical recording medium of the present invention. (He) is a graph showing the relationship with (He).
Claims (1)
からなシ、かつ膜面に垂直な方向に磁化容易軸を有する
ことを特徴とする、磁気記録媒体。1. A magnetic recording medium, characterized in that it is made of a Tb--Fe alloy containing at least 0.5 atomic percent copper, and has an axis of easy magnetization in a direction perpendicular to the film surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57206035A JPS5996713A (en) | 1982-11-26 | 1982-11-26 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57206035A JPS5996713A (en) | 1982-11-26 | 1982-11-26 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5996713A true JPS5996713A (en) | 1984-06-04 |
Family
ID=16516814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57206035A Pending JPS5996713A (en) | 1982-11-26 | 1982-11-26 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5996713A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6118107A (en) * | 1984-07-04 | 1986-01-27 | Ricoh Co Ltd | Non-crystalline magneto-optical layer |
| JPS62132254A (en) * | 1985-12-05 | 1987-06-15 | Hitachi Maxell Ltd | Photomagnetic recording medium |
-
1982
- 1982-11-26 JP JP57206035A patent/JPS5996713A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6118107A (en) * | 1984-07-04 | 1986-01-27 | Ricoh Co Ltd | Non-crystalline magneto-optical layer |
| JPS62132254A (en) * | 1985-12-05 | 1987-06-15 | Hitachi Maxell Ltd | Photomagnetic recording medium |
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