JPH02227814A - Perpendicular magnetic recording medium and production thereof - Google Patents
Perpendicular magnetic recording medium and production thereofInfo
- Publication number
- JPH02227814A JPH02227814A JP4700989A JP4700989A JPH02227814A JP H02227814 A JPH02227814 A JP H02227814A JP 4700989 A JP4700989 A JP 4700989A JP 4700989 A JP4700989 A JP 4700989A JP H02227814 A JPH02227814 A JP H02227814A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- layer
- perpendicular magnetic
- recording medium
- base material
- 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 121
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims abstract description 30
- 230000005293 ferrimagnetic effect Effects 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000008707 rearrangement Effects 0.000 claims description 3
- 230000005308 ferrimagnetism Effects 0.000 abstract 4
- 230000005415 magnetization Effects 0.000 description 24
- 229910000859 α-Fe Inorganic materials 0.000 description 14
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 11
- 239000010952 cobalt-chrome Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 238000004544 sputter deposition Methods 0.000 description 7
- 239000010408 film Substances 0.000 description 5
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 5
- 229920006122 polyamide resin Polymers 0.000 description 5
- ZAKOWWREFLAJOT-CEFNRUSXSA-N D-alpha-tocopherylacetate Chemical compound CC(=O)OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1C ZAKOWWREFLAJOT-CEFNRUSXSA-N 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229910002546 FeCo Inorganic materials 0.000 description 1
- 206010067482 No adverse event Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Thin Magnetic Films (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、垂直磁気記録媒体及びその製造方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic recording medium and a method for manufacturing the same.
［従来の技術］
垂直磁気記録においては、その情報たる磁化反転を担う
垂直磁気記録層の垂直磁気異方性が大きいことが望まれ
る。そのため、垂直磁気記録層の材質としてはＣｏＣｒ
合金、特にスパッタにより成膜されたものがよく用いら
れている。 （垂直ｆ１１気記録及び垂直磁気異方性に
ついては、例えば「垂直磁化を用いた高密度記録」岩崎
俊−著、日経エレクトロニクス ！９７８年８月７日号
、Ｐ１００〜ｉｌｌ参！Ｍ？）
しかし、このＣｏＣｒをスパッタリング法で成膜して形
成した垂直磁気記録媒体においても、その垂直磁気異方
性は不充分であり、記録密度を充分高くできないという
問題点があった。[Prior Art] In perpendicular magnetic recording, it is desired that the perpendicular magnetic recording layer, which is responsible for magnetization reversal, which is information, has a large perpendicular magnetic anisotropy. Therefore, the material for the perpendicular magnetic recording layer is CoCr.
Alloys, especially those formed by sputtering, are often used. (For details on perpendicular f11 recording and perpendicular magnetic anisotropy, see, for example, "High-density recording using perpendicular magnetization" by Shun Iwasaki, Nikkei Electronics! August 7, 1978 issue, P100-ill!M?) However, Even in a perpendicular magnetic recording medium formed by depositing CoCr by sputtering, the perpendicular magnetic anisotropy is insufficient and the recording density cannot be sufficiently increased.
第６図は従来の垂直磁気記録媒体の構成を示す断面図で
、図中（１）は基材、例えばＮｉＰメツキ処理したアル
ミニウム基板、（３）は垂直磁気記録層、例えばＣｏＣ
ｒＮであるｅ Ｎ ＋ Ｐメツキ処理したアルミニウ
ム基板（１）に公知のスパッタリング技術にて、基板温
度１５０℃で厚さ０．３μ−のＣｏＣｒｌｉｉ！ （３
）を設け、これに表面潤滑処理を施した垂直磁気記録媒
体を用い、ギャップ長０．３μ−のリング型磁気ヘッド
で記録再生を行った。ヘッド浮上量は０．２μ圀、出力
は５ｋＦＲＰ＋であった。その結果の出力と限界記録密
度（再生電圧が１／２に低下する密度）Ｄｓａを表１の
ｂ欄に示す。また、上記垂直磁気記録媒体を切り出し、
ＶＳＭ（［動試料型磁力計）、トルクメータにて測定し
た静＠気特性の保持力Ｈｃ、 異方性磁界ｒ］に、及
び飽和磁化Ｍｓを表のａ欄に示す。限界記録密度Ｄ５α
の値は２０ｋＦＲＰ ＋と、従来の面内記録方式の磁気
記録媒体と比較してそれほと優れてはいなかった。FIG. 6 is a cross-sectional view showing the structure of a conventional perpendicular magnetic recording medium, in which (1) is a base material, such as an aluminum substrate plated with NiP, and (3) is a perpendicular magnetic recording layer, such as CoC.
A CoCrlii film having a thickness of 0.3 μ- is deposited on an aluminum substrate (1) plated with rN e N + P using a known sputtering technique at a substrate temperature of 150°C. (3
), and using a perpendicular magnetic recording medium on which surface lubrication treatment was applied, recording and reproduction were carried out using a ring-shaped magnetic head with a gap length of 0.3 .mu.m. The head flying height was 0.2μ, and the output was 5kFRP+. The resulting output and critical recording density (density at which the reproduction voltage is reduced to 1/2) Dsa are shown in column b of Table 1. In addition, the above perpendicular magnetic recording medium is cut out,
Coercive force Hc, anisotropic magnetic field r], and saturation magnetization Ms of the static @air characteristic measured using a VSM ([moving sample magnetometer)] and a torque meter are shown in column a of the table. Limit recording density D5α
The value was 20 kFRP +, which was not much better than a conventional longitudinal recording type magnetic recording medium.
［発明が解決しようとする課題］
従来の垂直磁気記録媒体は以上のように、面内記録方式
と比較してそれほど記録密度を大きくすることができず
、より記録密度の大きい垂直磁気記録媒体の出現が望ま
れていた。[Problem to be solved by the invention] As described above, the recording density of conventional perpendicular magnetic recording media cannot be increased much compared to the longitudinal recording method. It was hoped that it would appear.
本発明は上記のような問題点を解消するためになされた
もので、垂直磁気記録層、例えばＣｏＣｒの垂直磁気異
方性を改善し、高密度記録が可能な垂直磁気記録媒体を
得ることを目的とする。The present invention has been made to solve the above-mentioned problems, and aims to improve the perpendicular magnetic anisotropy of a perpendicular magnetic recording layer, such as CoCr, and to obtain a perpendicular magnetic recording medium capable of high-density recording. purpose.
［課題を解決するための手段］
本発明の垂直磁気記録媒体は、基材にその補償温度が磁
気記録再生温度範囲にあるフェリ磁性層を設け、このフ
ェリ磁性層上に垂直磁気記録層を設けたものである。[Means for Solving the Problems] The perpendicular magnetic recording medium of the present invention is provided with a ferrimagnetic layer whose compensation temperature is within the magnetic recording and reproducing temperature range on a base material, and a perpendicular magnetic recording layer on the ferrimagnetic layer. It is something that
また、垂直磁気記録媒体の製造方法は、基材にその補償
温度が磁気記録再生温度範囲にあるフェリ磁性層を設け
、このフェリ磁性層を形成した基材面に垂直方向に磁界
を印加し、かつ上記フェリ磁性層の保持力がＬ記印加磁
界よりも小さくなるよっに加熱して上記フェリ磁性層−
Ｅに垂直磁気記録層を成膜するようにしたものである。In addition, a method for manufacturing a perpendicular magnetic recording medium includes providing a ferrimagnetic layer whose compensation temperature is within the magnetic recording and reproducing temperature range on a base material, applying a magnetic field perpendicularly to the surface of the base material on which this ferrimagnetic layer is formed, and the ferrimagnetic layer is heated such that the coercive force of the ferrimagnetic layer becomes smaller than the applied magnetic field L.
A perpendicular magnetic recording layer is formed on E.
さらに、別の垂直磁気記録媒体の製造方法は、基材にそ
の補ｆａ温度が磁気記録再生温度範囲にあるフェリ磁性
層を設け、このフェリ磁性層上に垂直＠気記録層を設け
たものを、上記垂直磁気記録層中で再配列が生じる温度
以上に加熱し、上記基材面に垂直方向に磁界を印加しな
がら冷却するようにしたものである。Furthermore, another method for manufacturing a perpendicular magnetic recording medium is to provide a ferrimagnetic layer whose cofa temperature is within the magnetic recording and reproducing temperature range on a base material, and to provide a perpendicular magnetic recording layer on this ferrimagnetic layer. The perpendicular magnetic recording layer is heated to a temperature higher than that at which realignment occurs, and is cooled while applying a magnetic field perpendicularly to the surface of the base material.
［作用］
本発明の垂直磁気記録媒体においては、フェリ磁性層の
磁化によって垂直磁気記録層の垂直磁気売方性を改善で
きるので、高密度に記録できる。[Function] In the perpendicular magnetic recording medium of the present invention, since the perpendicular magnetic selling property of the perpendicular magnetic recording layer can be improved by the magnetization of the ferrimagnetic layer, high-density recording is possible.
なお、フェリ磁性層はその補償温度がｆｊｉ気記録再生
温度範囲にあるので、通常使用時には飽和磁化が極めて
小さく読み出すことができず、また保持力が極めて大き
いため書き込むことができないので記録再生特性に悪影
響を与えない。Note that the compensation temperature of the ferrimagnetic layer is within the fjii recording and reproducing temperature range, so during normal use, the saturation magnetization is extremely small and cannot be read, and the coercive force is extremely large so it cannot be written, so the recording and reproducing characteristics are affected. No adverse effects.
即ち、垂直磁気記録層成膜時に磁界を印加することによ
りフェリ磁性層が基材に垂直に磁化されているので、そ
の磁化の影響によって成膜される例えばＣｏＣｒ粒子は
その磁化容易軸が基材に垂直に配向しやすくなる。That is, since the ferrimagnetic layer is magnetized perpendicularly to the base material by applying a magnetic field during the deposition of the perpendicular magnetic recording layer, the axis of easy magnetization of, for example, CoCr particles, which is deposited under the influence of magnetization, is aligned with the base material. It becomes easier to orient perpendicular to.
また、前述の冷却過程において磁界を印加することによ
りフェリ磁性層が基材に垂直に磁化されているので、そ
の磁化の影響によって可塑状態にある例えばＥｌ ａフ
ェライト磁性層が垂直方向に磁気配向を起こし易くなる
と考えられる。In addition, since the ferrimagnetic layer is magnetized perpendicularly to the base material by applying a magnetic field in the cooling process described above, for example, an El a ferrite magnetic layer in a plastic state is magnetically oriented in the perpendicular direction due to the influence of magnetization. This is thought to make it easier to wake up.
［実施例］ 以下、本発明の実施例を図に基づいて説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例の垂直磁気記録媒体を示す断
面図で、（１）は基材、この場合はＮｉＰメツキ処理し
たアルミニウム基板、４（２）はその補償温度が磁気記
録再生温度範囲にあるフェリ磁性層、この場合はＴｂ２
ｎ（ＦｅＩＩａＣｏ＋４））ｙｓＦ （以下ＴｂＦｅＣ
ｏ層と記す）、（３）は垂直磁気記録層、この場合はＣ
ｏｃ ｒＰ！である。FIG. 1 is a cross-sectional view showing a perpendicular magnetic recording medium according to an embodiment of the present invention, in which (1) is a base material, in this case an aluminum substrate plated with NiP, and (4) is a compensation temperature for magnetic recording and reproduction. Ferrimagnetic layer in the temperature range, in this case Tb2
n(FeIIaCo+4))ysF (hereinafter TbFeC
o layer), (3) is a perpendicular magnetic recording layer, in this case C
ocrP! It is.
この一実施例の垂直磁気記録媒体を製造するには、まず
基板（＋）上に公知のスパッタリング法を用いてフェリ
磁性層のＴｂＦｅＣｏ層（２）を０．５μ−程度設ける
。To manufacture the perpendicular magnetic recording medium of this embodiment, first, a TbFeCo layer (2) of approximately 0.5 μm as a ferrimagnetic layer is provided on a substrate (+) using a known sputtering method.
ところで、このフェリ磁性層、 Ｔ ｂＦ ｅｃ ｏＮ
の補償温度Ｔ ｃｏｍｐはその１’ｂｔｓ度によって変
化する。By the way, this ferrimagnetic layer, T bF ecoN
The compensation temperature T comp of T comp changes by its 1'bts degree.
第２図の特性図に組成をＴ ｂｘ（Ｆ ｅＩＩｓｃ ０
１４）Ｉ−ｘとした場合の Ｔ ｃｏｌＩｐとＴｂ濃度
の関係を示す。横軸はＴｂ１１度（ｘ ）（ａｔ％）を
、縦軸は補償温度Ｔ ｃｏｓｐ（℃）を表わしている。The composition is shown in the characteristic diagram of Fig. 2 as T bx (F eIIsc 0
14) Shows the relationship between T colIp and Tb concentration when I-x. The horizontal axis represents Tb11 degrees (x 2 ) (at%), and the vertical axis represents the compensation temperature T cosp (° C.).
この実施例の場合使用（磁気記録再生）する環境は通常
の室温を対象としており、補償温度を室温とすべくＴｂ
濃度が２４ａｔ％となるようにターゲット組成を：ｌｌ
！ＩＬ／てスパッタリングを行った。In this example, the environment used (magnetic recording and reproducing) is intended for normal room temperature, and in order to set the compensation temperature to room temperature, Tb
Target composition so that the concentration is 24at%:ll
! Sputtering was performed using IL/.
このＴ ｂ２ｍ（Ｆ ｅａａｃ ｏｗｎ）ｙｓ膜の温度
と膜面垂直方向の飽和磁化及び保持力の関係を第３図の
特性図に示す、横軸は温度（’Ｃ）を、縦軸は飽和磁化
（ｅｍｕ／ＣＣ）及び保持力（ｋＯｅ）を表わしている
。The relationship between the temperature of this T b2m (F eaac own) ys film, the saturation magnetization in the direction perpendicular to the film surface, and the coercive force is shown in the characteristic diagram in Figure 3, where the horizontal axis represents the temperature ('C) and the vertical axis represents the saturation magnetization. (emu/CC) and retention force (kOe).
次に、プラズマ収束コイル等を用いて基材（１）に２５
００ｅの磁界を基材（１）に垂直に印加し、かつ基材（
１）を１５０℃に加熱して、ターゲットをＣｏ −Ｃｒ
としてスパッタリングにより、Ｔ ｂＦ ｅＣｏ層（２
）上にＣｏＣｒ層（３）を０．３μｓ設けた。Next, using a plasma convergence coil or the like, apply 25% to the base material (1).
A magnetic field of 00e is applied perpendicularly to the base material (1), and the base material (
1) is heated to 150°C to transform the target into Co-Cr
A T bF eCo layer (2
) was provided with a CoCr layer (3) for 0.3 μs.
この際、第３図の一点鎖線かられかるように、基材温度
が１５０℃であれば、Ｔ ｂＦ ｅＣｏ層（２）は保持
力に打ち勝って磁化され、その飽和磁化は ７０ｅｍｕ
／ＣＣで、７０ｅｍｕ／ＣＣの磁化が生じる。 （Ｔｂ
ＦｅＣｏについては、例えば工業材料、第３６巻、第８
号、４７．４μ頁参照） このＴｂＦｅＣｏ層（２）上
にＣｏＣｒをスパッタリングすると、第４図の説明図に
示すように、収束コイル等により誘導された Ｔ ｂＦ
ｅＣ。At this time, as can be seen from the dashed line in Fig. 3, if the substrate temperature is 150°C, the T bF eCo layer (2) is magnetized by overcoming the coercive force, and its saturation magnetization is 70 emu.
/CC, a magnetization of 70 emu/CC occurs. (Tb
Regarding FeCo, for example, Industrial Materials, Vol. 36, No. 8
When CoCr is sputtered onto this TbFeCo layer (2), as shown in the explanatory diagram of FIG.
eC.
層（２）の磁化（２１）によりスパッタされたＣｏＣｒ
粒子（３Ｉ）はその磁化容易軸（３１ａ）が垂直に配向
しやすくなる。矢印（Ａ）は磁力線を表わす。Sputtered CoCr with magnetization (21) of layer (2)
The axis of easy magnetization (31a) of the particle (3I) tends to be vertically oriented. Arrows (A) represent lines of magnetic force.
この様にして作成した試料に潤滑処理を施した垂直磁気
記録媒体を用い、従来例と同様にしてギャップ長０．３
μ糟のリング型磁気ヘッドで記録再生を行った。ヘッド
浮上量は０．２μ組 出力は５ｋＦＲＰｌであった。そ
の結果を表１のｂ欄に示す。また、上記垂直ｆ１１気記
録媒体を切り出し、ＶＳＭ、トルクメータにて測定した
静磁気特性を表のａ欄に示す、限界記録密度Ｄ５１Ｉの
値は４０ｋＦＲＰ ｌと、′Ｉ”ｂＦｅＣｏ層を設けて
いない媒体よりも大幅に改善されている。これは、上述
のＣｏＣｒをスパッタリングする際のＴ ｂＦ ｅＣｏ
層の磁化により、垂直磁気異方性が改善されたためと考
えられる。Using a lubricated perpendicular magnetic recording medium for the sample prepared in this way, the gap length was 0.3 as in the conventional example.
Recording and reproduction were performed using a μ-ring magnetic head. The head flying height was 0.2μ, and the output was 5kFRPl. The results are shown in column b of Table 1. In addition, the above perpendicular f11 recording medium was cut out and the magnetostatic properties measured using a VSM and a torque meter are shown in column a of the table. This is a significant improvement over the T bF eCo medium when sputtering CoCr mentioned above.
This is thought to be due to the perpendicular magnetic anisotropy being improved by the magnetization of the layer.
また、Ｔ ｂＦ ｅＣｏ層はその補償温度を室温付近に
設定したので、室温で用いる通常の場合には飽和磁化が
極めて小さく読み出すことができず、また保持力が極め
て大きいため書き込むことができないので、磁気記録再
生特性に殆ど影ｉは与えない。In addition, since the compensation temperature of the T bF eCo layer is set near room temperature, when it is normally used at room temperature, the saturation magnetization is extremely small and cannot be read, and the coercive force is extremely large so it cannot be written. It hardly affects the magnetic recording and reproducing characteristics.
第５図は本発明の他の実施例のバリウムフェライト塗布
形垂直磁気記録媒俸を示す模式図である。FIG. 5 is a schematic diagram showing a barium ferrite coated perpendicular magnetic recording medium according to another embodiment of the present invention.
（３）は垂直磁気記録層で、この場合はバリウムフェラ
イト塗布形垂直磁気記録層（以下Ｂａフェライト磁性層
と記す）で、バリウ（Ｂａ）フェライト磁性粉（３ａ）
を熱可塑性樹脂、例えばポリアミド樹脂（３ｂ）中に分
散させたものである。矢印（３２）は磁化方向を下す。(3) is a perpendicular magnetic recording layer, in this case a barium ferrite coated perpendicular magnetic recording layer (hereinafter referred to as Ba ferrite magnetic layer), which is made of barium ferrite magnetic powder (3a).
is dispersed in a thermoplastic resin, for example, a polyamide resin (3b). The arrow (32) indicates the direction of magnetization.
この他の実施例の垂直磁気記録媒体を製造するには、上
記実施例と同様に、まず基材（１）上に公知のスパッタ
リング法を用いてフェリ磁性層のＴｂ２＊（ＦｅｓｓＣ
ｏ＋４）ｙａＦｊ（２）を成膜した後、ＴｂＦｅＣｏ層
（２）上に Ｂａフェライト磁性粉（３ａ）を分散させ
たポリアミド樹脂（３ｂ）を公知の方法で塗布し、Ｂａ
フェライト磁性層（３）を形成する。しかる後、Ｂａフ
ェライト磁性層（３）中で再配列が生じる温度以上に加
熱する。即ち熱可塑性樹脂の軟化温度以上に、この場合
はポリアミド樹脂（３ｂ）の軟化温度約１５０℃まで真
空中で加熱する。その後冷却硬化させる過程において、
Ｔ ｂＦ ｅＣｏ層（２）、Ｂａフェライト磁性層（３
）面に垂直方向に２０００ ｅの磁界を印加する。 （
バリウムフェライト塗布形垂直磁気記録媒体に明しては
例えば東芝レビュー１９８５ＶＯＬ４０ ＮＯ，１３
Ｐ、１１０７〜１ｌ１４を参照）この様にして得られた
Ｂａフェライト磁気記録媒体と、ＴｂＦｅＣｏ層（２
）を形成せずに同様の１程を経て形成した Ｂａフェラ
イト磁気記録媒体とを比較したところ、垂直方向の保磁
力Ｈｃｖ、面内方向の保磁力ＨＣｇ、及び両者の比Ｈｃ
ｖ／ＨｃＲは表２に示す結果となった。表よりこの実施
例の１゛ｂＦ ｅＣｏＮ （２）を有するＢａフェライ
ト磁気記録媒体の方が垂直磁気記録に向いていることが
わかる。In order to manufacture the perpendicular magnetic recording medium of this other example, in the same manner as in the above example, a ferrimagnetic layer of Tb2* (FessC
o+4) After forming a film of yaFj (2), a polyamide resin (3b) in which Ba ferrite magnetic powder (3a) is dispersed is applied on the TbFeCo layer (2) by a known method.
A ferrite magnetic layer (3) is formed. Thereafter, the Ba ferrite magnetic layer (3) is heated to a temperature above which rearrangement occurs. That is, it is heated in vacuum to a temperature higher than the softening temperature of the thermoplastic resin, in this case to about 150° C., the softening temperature of the polyamide resin (3b). In the subsequent cooling and hardening process,
T bF eCo layer (2), Ba ferrite magnetic layer (3
) A magnetic field of 2000 e is applied perpendicular to the plane. (
Regarding barium ferrite coated perpendicular magnetic recording media, for example, Toshiba Review 1985 VOL 40 NO, 13
P, 1107-1l14) The Ba ferrite magnetic recording medium thus obtained and the TbFeCo layer (2
) was compared with a Ba ferrite magnetic recording medium formed through the same step 1 without forming a ferrite magnetic recording medium.
The v/HcR results are shown in Table 2. From the table, it can be seen that the Ba ferrite magnetic recording medium having 1<b>F eCoN (2) of this example is more suitable for perpendicular magnetic recording.
これは、冷却硬化過程において磁界を印加することで、
上記実施例で説明したようにＴ ｂＦ ｅＣ。This is achieved by applying a magnetic field during the cooling and hardening process.
T bF eC as described in the examples above.
Ｎ（２）が保持力に打ら勝って基材面に垂直方向に磁化
されており、その磁化の影響によって 可塑状態にある
Ｂａフェライト磁性層（３）が垂直方向に磁気配向を
起こし易くなるためと考えられる。N(2) overcomes the coercive force and is magnetized in the direction perpendicular to the base material surface, and due to the influence of this magnetization, the Ba ferrite magnetic layer (3), which is in a plastic state, tends to cause magnetic orientation in the perpendicular direction. It is thought that this is because of this.
即ちポリアミド樹脂（３ｂ）が軟化してＴ ｂＦ ｅＣ
ｏ層（２）の磁化によりＢａフェライト磁性粉（３ａ）
が磁化方向に再配列を起こすためと考えられる。なお、
磁界は加熱する時から印加しておいてもよい。That is, the polyamide resin (3b) softens and becomes T bF eC
Ba ferrite magnetic powder (3a) due to magnetization of o layer (2)
This is thought to be due to rearrangement in the magnetization direction. In addition,
The magnetic field may be applied from the time of heating.
また、この実施例においても上記実施例と同様Ｔ ｂＦ
ｅＣｏ層はその補償温度を室温付近に設定したので、
室温で用いる通常の場合には磁気記録再生特性に殆ど影
響は与えない。Also, in this example, T bF
Since the compensation temperature of the eCo layer was set near room temperature,
When used normally at room temperature, it has little effect on magnetic recording and reproducing characteristics.
ところで、上記実施例では垂直磁気記録層（３）がスパ
ッタリングにより形成したＣｏＣｒ層である薄膜形の垂
直磁気記録媒体の場合と、バリウムフェライト塗布形垂
直磁気記録層の場合について説明したが、これに限るも
のではない。また、フェリ磁性層についても、上述のＴ
ｂＦｅＣｏに限らず、ＧｄＦｅＣｏ等、磁気記録媒体の
使用状態に応じ適宜選択すればよい。Incidentally, in the above embodiments, the case of a thin film type perpendicular magnetic recording medium in which the perpendicular magnetic recording layer (3) is a CoCr layer formed by sputtering and the case of a barium ferrite coated perpendicular magnetic recording layer have been explained. It is not limited. Also, regarding the ferrimagnetic layer, the above-mentioned T
In addition to bFeCo, GdFeCo or the like may be selected as appropriate depending on the usage condition of the magnetic recording medium.
［発明の効果］
以上のように、本発明によれば、基材にその補償温度が
磁気記録再生温度範囲にあるフェリ磁性層を設け、この
フェリ磁性層上に垂直磁気記録層を設けたものにするこ
とにより、フェリ磁性層の磁化によって垂直ｆｊｉ＆気
記録層の垂直磁気異方性を改善でき、高密度に記録でき
る垂直磁気記録媒体が得られる効果がある。[Effects of the Invention] As described above, according to the present invention, a ferrimagnetic layer whose compensation temperature is within the magnetic recording and reproducing temperature range is provided on the base material, and a perpendicular magnetic recording layer is provided on the ferrimagnetic layer. By doing so, the perpendicular magnetic anisotropy of the perpendicular fji & magnetic recording layer can be improved by the magnetization of the ferrimagnetic layer, and a perpendicular magnetic recording medium capable of high-density recording can be obtained.
即ち、基材にその補償温度が磁気記録再生温度範囲にあ
るフェリ磁性層を設け、このフェリ磁性層を形成した基
材面に垂直方向に磁界を印加し、かつｔ記フェリ磁性層
の保持力が上記印加磁界よりも小さくなるように上記基
材を加熱してＥ記フェリ磁性層上に暇直磁気記録層を成
膜することにより垂直磁気異方性が改善され、高密度に
記録できる磁気記録媒体が得られる。That is, a ferrimagnetic layer whose compensation temperature is within the magnetic recording/reproduction temperature range is provided on the base material, a magnetic field is applied in a direction perpendicular to the surface of the base material on which this ferrimagnetic layer is formed, and the coercive force of the ferrimagnetic layer is The perpendicular magnetic anisotropy is improved by heating the base material so that the magnetic field is smaller than the applied magnetic field and forming a perpendicular magnetic recording layer on the E ferrimagnetic layer. A recording medium is obtained.
また、基材にその補償温度が磁気記録再生温度範囲にあ
るフェリ磁性層を設け、このフェリ磁性層上に垂直磁気
記！ｊ＋Ｆｊを設けたものを、−上記垂直磁気記録層中
で再配列が生じる温度以上に加熱し、上記基材面に垂直
方向に磁界を印加しながら冷却することにより、垂直磁
気異方性が改善され、高密度に記録できる磁気記録媒体
が得られる。In addition, a ferrimagnetic layer whose compensation temperature is within the magnetic recording/reproducing temperature range is provided on the base material, and perpendicular magnetic recording is performed on the ferrimagnetic layer. The perpendicular magnetic anisotropy is improved by heating the material provided with j+Fj above the temperature at which realignment occurs in the perpendicular magnetic recording layer and cooling it while applying a magnetic field in the direction perpendicular to the substrate surface. A magnetic recording medium capable of high-density recording is obtained.
第１図は本発明の一実施例の垂直磁気記録媒体を示す断
面図、第２図は本発明に係るＴｂ工（ＦｅｓｓＣＯ１４
）Ｉ−ＸのＴ ｃｏｍｐとＴｂ１１度の関係を示す特性
図、第３図は本発明に係わるＴ ｂ２ｉ（Ｆ ｅａａｃ
０１４）７８１１ＪＩの温度と膜面垂直方向の飽和磁
化及び保持力の関係を示す特性図、第４図は本発明の一
実施例の製造方法の説明図、第５図は本発明の他の実施
例を示す模式図、第６図は従来例を示す断面図である。
図において、（１）は基材、（２）はフェリ磁性層であ
るＴｂＦｅＣｏ層、（２１）はフェリ磁性層の磁化、（
３）は垂直磁気記録層である、ＣｏＣｒ層とＢａフェラ
イト磁性層、（３１）はＣｏＣｒ粒子、（３１ａ）は磁
化容易軸、（Ａ）は磁力線、（３ａ）はＢａフェライト
磁性粉、熱可塑性樹脂であるポリアミド樹脂である。
なお、図中、同一符号は同一または相当部分を示す。FIG. 1 is a sectional view showing a perpendicular magnetic recording medium according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a perpendicular magnetic recording medium according to an embodiment of the present invention.
)I-X T comp and Tb11 degree, FIG. 3 is a characteristic diagram showing the relationship between T b2i (F eaac
014) A characteristic diagram showing the relationship between temperature, saturation magnetization in the direction perpendicular to the film surface, and coercive force of 7811JI, Figure 4 is an explanatory diagram of the manufacturing method of one embodiment of the present invention, and Figure 5 is another embodiment of the present invention. A schematic diagram showing an example, and FIG. 6 is a sectional view showing a conventional example. In the figure, (1) is the base material, (2) is the TbFeCo layer which is the ferrimagnetic layer, (21) is the magnetization of the ferrimagnetic layer, (
3) is a perpendicular magnetic recording layer, a CoCr layer and a Ba ferrite magnetic layer, (31) is a CoCr particle, (31a) is an axis of easy magnetization, (A) is a line of magnetic force, (3a) is a Ba ferrite magnetic powder, thermoplastic The resin is polyamide resin. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (3)
るフェリ磁性層を設け、このフェリ磁性層上に垂直磁気
記録層を設けた垂直磁気記録媒体。(1) A perpendicular magnetic recording medium in which a ferrimagnetic layer whose compensation temperature is within the magnetic recording and reproducing temperature range is provided on a base material, and a perpendicular magnetic recording layer is provided on this ferrimagnetic layer.
るフェリ磁性層を設け、このフェリ磁性層を形成した基
材面に垂直方向に磁界を印加し、かつ上記フェリ磁性層
の保持力が上記印加磁界よりも小さくなるように上記基
材を加熱して上記フェリ磁性層上に垂直磁気記録層を成
膜するようにした垂直磁気記録媒体の製造方法。(2) A ferrimagnetic layer whose compensation temperature is within the magnetic recording/reproduction temperature range is provided on the base material, a magnetic field is applied perpendicularly to the surface of the base material on which this ferrimagnetic layer is formed, and the coercive force of the ferrimagnetic layer is A method for producing a perpendicular magnetic recording medium, the method comprising: heating the base material such that the applied magnetic field is smaller than the applied magnetic field to form a perpendicular magnetic recording layer on the ferrimagnetic layer.
るフェリ磁性層を設け、このフェリ磁性層上に垂直磁気
記録層を設けたものを、上記垂直磁気記録層中で再配列
が生じる温度以上に加熱し、上記基材面に垂直方向に磁
界を印加しながら冷却するようにした垂直磁気記録媒体
の製造方法。(3) When a substrate is provided with a ferrimagnetic layer whose compensation temperature is within the magnetic recording and reproducing temperature range, and a perpendicular magnetic recording layer is provided on the ferrimagnetic layer, rearrangement occurs in the perpendicular magnetic recording layer. A method for manufacturing a perpendicular magnetic recording medium, which comprises heating the substrate above a temperature and cooling the substrate while applying a magnetic field in a direction perpendicular to the surface of the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4700989A JPH02227814A (en) | 1989-02-28 | 1989-02-28 | Perpendicular magnetic recording medium and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4700989A JPH02227814A (en) | 1989-02-28 | 1989-02-28 | Perpendicular magnetic recording medium and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02227814A true JPH02227814A (en) | 1990-09-11 |
Family
ID=12763171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4700989A Pending JPH02227814A (en) | 1989-02-28 | 1989-02-28 | Perpendicular magnetic recording medium and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02227814A (en) |
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|---|---|---|---|---|
| WO2002095739A1 (en) * | 2001-05-23 | 2002-11-28 | Fujitsu Limited | Vertical recording type magnetic recording medilim and magnetic memory device using the medium |
| EP1324317A1 (en) * | 2001-12-27 | 2003-07-02 | Fujitsu Limited | Information recording medium and information storing device |
| US6720075B2 (en) * | 1999-09-30 | 2004-04-13 | Fujitsu Limited | Magnetic recording medium and magnetic recording medium driver for the medium with N-type ferrimagnetic recording layer |
| US6794028B2 (en) * | 2001-08-31 | 2004-09-21 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and a method of manufacturing the same |
| US6884520B2 (en) | 2001-12-07 | 2005-04-26 | Fuji Electric Co., Ld. | Perpendicular magnetic recording medium and method of manufacturing the same and product thereof |
| US6913837B2 (en) * | 2001-07-06 | 2005-07-05 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and fabrication method thereof |
| US7067206B2 (en) | 2001-08-31 | 2006-06-27 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and a method of manufacturing the same |
| US7147942B2 (en) | 2001-12-07 | 2006-12-12 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and method of manufacturing the same and product thereof |
| US7183011B2 (en) | 2002-01-17 | 2007-02-27 | Fuji Electric Co., Ltd. | Magnetic recording medium |
-
1989
- 1989-02-28 JP JP4700989A patent/JPH02227814A/en active Pending
Cited By (16)
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|---|---|---|---|---|
| US6720075B2 (en) * | 1999-09-30 | 2004-04-13 | Fujitsu Limited | Magnetic recording medium and magnetic recording medium driver for the medium with N-type ferrimagnetic recording layer |
| KR100757816B1 (en) * | 2001-05-23 | 2007-09-11 | 후지쯔 가부시끼가이샤 | Vertical recording type magnetic recording medium and magnetic memory device using the medium |
| US7525762B2 (en) | 2001-05-23 | 2009-04-28 | Fujitsu Limted | Magnetic recording medium for perpendicular recording |
| WO2002095739A1 (en) * | 2001-05-23 | 2002-11-28 | Fujitsu Limited | Vertical recording type magnetic recording medilim and magnetic memory device using the medium |
| US7295404B2 (en) | 2001-05-23 | 2007-11-13 | Fujitsu Limited | Magnetic recording medium for perpendicular recording and magnetic storage apparatus using the same |
| US7635498B2 (en) | 2001-07-06 | 2009-12-22 | Fuji Electric Device Technology, Co., Ltd. | Fabrication method for perpendicular magnetic recording media |
| US6913837B2 (en) * | 2001-07-06 | 2005-07-05 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and fabrication method thereof |
| USRE41282E1 (en) | 2001-08-31 | 2010-04-27 | Fuji Electric Device Technology Co., Ltd. | Perpendicular magnetic recording medium and a method of manufacturing the same |
| US6794028B2 (en) * | 2001-08-31 | 2004-09-21 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and a method of manufacturing the same |
| US7067206B2 (en) | 2001-08-31 | 2006-06-27 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and a method of manufacturing the same |
| US7147942B2 (en) | 2001-12-07 | 2006-12-12 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and method of manufacturing the same and product thereof |
| US6884520B2 (en) | 2001-12-07 | 2005-04-26 | Fuji Electric Co., Ld. | Perpendicular magnetic recording medium and method of manufacturing the same and product thereof |
| US8252152B2 (en) | 2001-12-07 | 2012-08-28 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and method of manufacturing the same and product thereof |
| US6875527B2 (en) | 2001-12-27 | 2005-04-05 | Fujitsu Limited | Information recording medium and information storing device |
| EP1324317A1 (en) * | 2001-12-27 | 2003-07-02 | Fujitsu Limited | Information recording medium and information storing device |
| US7183011B2 (en) | 2002-01-17 | 2007-02-27 | Fuji Electric Co., Ltd. | Magnetic recording medium |
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