JPH10143838A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH10143838A JPH10143838A JP8295039A JP29503996A JPH10143838A JP H10143838 A JPH10143838 A JP H10143838A JP 8295039 A JP8295039 A JP 8295039A JP 29503996 A JP29503996 A JP 29503996A JP H10143838 A JPH10143838 A JP H10143838A
- Authority
- JP
- Japan
- Prior art keywords
- fluorine
- protective film
- magnetic recording
- layer
- magnetic
- 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.)
- Granted
Links
Landscapes
- Lubricants (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気ディスク装置
に用いられる磁気記録媒体に関し、特に長期安定性、摺
動耐久性に優れた潤滑層を有する磁気記録媒体に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium used in a magnetic disk drive, and more particularly to a magnetic recording medium having a lubricating layer having excellent long-term stability and sliding durability.
【０００２】[0002]
【従来の技術】薄膜型の磁気記録媒体においては、強磁
性金属又はその合金を、スパッタ、蒸着、無電解メッキ
法等によって非磁性基板上に被着させて製造される。実
際の使用時においては、しばしば磁気ヘッドと磁気記録
媒体とが高速で接触摺動するので、摩耗損傷を受けた
り、磁気特性の劣化を起こしたりする。そのため、磁性
層上に保護膜や潤滑層を設けることによって接触摺動の
際の静／動摩擦を極力低減させ、耐摩耗性を向上させる
ことが行われている。このような保護膜層としては、炭
素質膜、ＳｉＯ2 、ＺｒＯ2 の酸化物膜、窒化物膜、ホ
ウ化物膜等が一般的に利用され、また潤滑層としては、
一般的にパーフロロポリエーテル（Perfluoro Polyethe
rs）化合物がディスク表面に塗布されている。上記パー
フロロポリエーテル化合物としては、2. Description of the Related Art A thin film type magnetic recording medium is manufactured by depositing a ferromagnetic metal or an alloy thereof on a non-magnetic substrate by sputtering, vapor deposition, electroless plating or the like. In actual use, the magnetic head and the magnetic recording medium often contact and slide at a high speed, so that the magnetic head is damaged by wear and the magnetic characteristics are deteriorated. Therefore, by providing a protective film or a lubricating layer on the magnetic layer, static / dynamic friction at the time of contact sliding is reduced as much as possible, and wear resistance is improved. As such a protective film layer, a carbonaceous film, an oxide film of SiO 2 or ZrO 2 , a nitride film, a boride film, and the like are generally used.
Generally, perfluoropolyether
rs) The compound is applied to the disk surface. As the perfluoropolyether compound,
【化５】 で表される商品名「フォンブリン ゼットドール（FOMB
LIN ZDOL）」〔アウジモント（AUSIMONT）社製〕が知ら
れている。Embedded image Product name "Fomblin Zet Doll (FOMB
LIN ZDOL) "(manufactured by AUSIMONT).
【０００３】前記のように、使用時においてはしばしば
磁気ヘッドと磁気記録媒体とが高速で接触摺動する。即
ち、磁気記録媒体の起動時においては、ディスク媒体が
停止状態から急速に回転加速されるのに伴ってヘッドが
浮上するが、電源が切断されてディスク媒体を回転させ
ているモータが停止すると、ディスク媒体とヘッドが高
速で接触しながら摺動するのである。一方、面記録密度
を高める目的で、ヘッドの低浮上化並びにディスク回転
の高速化が求められており、近年では媒体基板はより平
滑になる方向にある。そして、潤滑層を設けて動摩擦係
数を低減することは、前記の接触摺動によって生ずる摩
耗損傷や磁気特性の劣化を抑制する目的においては極め
て有効であるものの、特にこの潤滑層の膜厚が厚い場合
や媒体基板が平滑である場合には、ヘッドとディスクと
の間に吸着現象が生じ易いため、静摩擦係数が増加し、
ヘッドがディスクに張り付いたまま動作不能となる。し
かもこのような吸着現象は、媒体基板を平滑にするにつ
れて発生し易くなる。逆に潤滑層の膜厚が薄い場合には
前記吸着現象の発生を抑制できるものの、十分な耐久性
が得られずに高速の接触摺動に起因する摩耗損傷や磁気
特性の劣化が生じ易いものとなる。そこで、潤滑層に用
いる潤滑剤を精選することにより、上述の問題を解消し
ようとする試みが種々なされている。例えば前記「フォ
ンブリン ゼットドール」は、分子の両末端にＣＨ2 Ｏ
Ｈ基を有しているために保護膜層の表面との結合が強
く、優れた耐摺動特性を付与するものとなる。As described above, the magnetic head and the magnetic recording medium often slide at high speed during use. That is, when the magnetic recording medium is started, the head floats as the disk medium is rapidly rotated and accelerated from the stopped state, but when the power is cut off and the motor that rotates the disk medium stops, The disk medium and the head slide while contacting at high speed. On the other hand, for the purpose of increasing the areal recording density, it is required to lower the flying height of the head and to increase the speed of disk rotation. Although providing a lubricating layer to reduce the dynamic friction coefficient is extremely effective for the purpose of suppressing wear damage and deterioration of magnetic characteristics caused by the contact sliding, the film thickness of the lubricating layer is particularly large. In the case or when the medium substrate is smooth, the sticking phenomenon easily occurs between the head and the disk, so that the coefficient of static friction increases,
The head becomes stuck on the disk and becomes inoperable. Moreover, such an adsorption phenomenon is more likely to occur as the medium substrate is made smoother. Conversely, when the thickness of the lubricating layer is small, the occurrence of the adsorption phenomenon can be suppressed, but sufficient durability is not obtained, and wear damage and deterioration of magnetic properties due to high-speed contact sliding are likely to occur. Becomes Therefore, various attempts have been made to solve the above-mentioned problem by carefully selecting the lubricant used for the lubricating layer. For example, the “Fomblin Zetdall” has CH 2 O at both ends of the molecule.
Since it has an H group, the bond with the surface of the protective film layer is strong, and excellent sliding resistance is provided.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、「フォ
ンブリン ゼットドール」は、文献（”Degradation of
perfluoropolyethers catalyzed by aluminum oxid
e”，Paul H.Kasai,Wing T.Tang and Patrick Wheeler,
Applied Surface Science,51(1991)201〜 211）で示さ
れているように、分子中にＯ−ＣＦ2 −Ｏ単位の結合を
有しているため、磁気ヘッドの構成成分である酸化アル
ミニウム（α−Ａｌ2 Ｏ3 ）の存在下では２００℃程度
の温度で容易に分解する。加えて、ＣＳＳ（コンタクト
スタート ストップ）時には磁気記録媒体と磁気ヘッ
ドの両者間の接触により局所的な瞬間温度は、９０〜４
５０℃或いはそれ以上の高温となる。したがって、磁気
ヘッドのスライダー部分の構成成分である酸化アルミニ
ウムが触媒となり、「フォンブリン ゼットドール」が
分解する。このように潤滑剤の分解が生ずると、分解し
た成分が揮発して潤滑層の膜厚が減少することにより、
動摩擦係数が増大し、その結果、高速の接触摺動に起因
する摩耗損傷や磁気特性の劣化が生じ易いという問題を
生じていた。さらに、分解した成分の一部が磁気ヘッド
に付着することにより、ヘッドの浮上量が増加して再生
出力の低下を引き起こしたり、ヘッドが記録媒体表面に
吸着する等の問題をも生じていた。However, "Fomblin Zett Doll" is described in the literature ("Degradation of
perfluoropolyethers catalyzed by aluminum oxid
e ”, Paul H. Kasai, Wing T. Tang and Patrick Wheeler,
As shown in Applied Surface Science, 51 (1991) 201 to 211), since a molecule has a bond of an O—CF 2 —O unit, aluminum oxide (α) which is a constituent component of a magnetic head is used. -Al 2 O 3 ) easily decomposes at a temperature of about 200 ° C. In addition, at the time of CSS (contact start / stop), the local instantaneous temperature becomes 90 to 4 due to contact between the magnetic recording medium and the magnetic head.
The temperature will be as high as 50 ° C or more. Therefore, aluminum oxide, which is a component of the slider portion of the magnetic head, acts as a catalyst, and "fomblin zett doll" is decomposed. When the decomposition of the lubricant occurs, the decomposed components volatilize and the thickness of the lubricating layer decreases,
The coefficient of kinetic friction increased, and as a result, there was a problem that abrasion damage and deterioration of magnetic properties due to high-speed contact sliding were likely to occur. Furthermore, when a part of the decomposed components adheres to the magnetic head, the flying height of the head increases, causing a decrease in the reproduction output, and the head is attracted to the recording medium surface.
【０００５】尤も、前記のように「フォンブリン ゼッ
トドール」は、分子の両末端の極性官能基が炭素系、又
は酸化物セラミックス系の保護膜層との間に高い結合性
を示し、優れた摺動特性が付与されるという利点を有す
るので、このように利点を保持したままで磁気ヘッドに
よる接触分解を抑制させる方法が希求されていた。However, as described above, “Fomblin Zetdall” has excellent binding properties between the polar functional groups at both ends of the molecule and a carbon-based or oxide ceramic-based protective film layer, and is excellent. Since it has the advantage of imparting sliding characteristics, there has been a need for a method of suppressing contact decomposition by a magnetic head while maintaining such an advantage.
【０００６】また、化学式Also, the chemical formula
【化６】 で表される化合物〔商品名「フォンブリン ゼットテト
ラオール」（アウジモント社製）〕は、前記「フォンブ
リン ゼットドール」と同様に分子中にＯ−ＣＦ 2 −Ｏ
単位の構造を含むにも係わらず、極性官能基の多座配位
構造によりヘッドのスライダー部の酸化アルミニウムと
の接触反応（分解）が緩和され、化学的に安定である。
また、その両末端の極性官能基が炭素系、又は酸化物セ
ラミックス系の保護膜との間に高い親和性を示し、スピ
ンオフ性の向上に寄与するので、安定性に優れている。Embedded image[Compound name “Fomblin Zet Tet”
Laor ”(Audimont)
O-CF in the molecule Two -O
Multidentate coordination of polar functional groups despite the unit structure
Due to the structure, aluminum oxide in the slider part of the head
Is moderated and chemically stable.
In addition, the polar functional groups at both ends are carbon-based or oxide-based.
Shows high affinity with Lamix-based protective film,
Excellent stability because it contributes to the improvement of turn-off properties.
【０００７】しかしながら、両末端の極性官能基と炭素
系、又は酸化物セラミックス系の保護膜との間の親和性
が高過ぎて、耐久性向上に寄与する潤滑層の上側の自由
に動ける潤滑剤成分がほとんどない。このため、疑似接
触型のヘッドのとの組み合わせでは摺動耐久性が劣る。However, since the affinity between the polar functional groups at both ends and the carbon-based or oxide ceramic-based protective film is too high, a freely movable lubricant on the upper side of the lubricating layer contributing to the improvement of durability. Almost no components. For this reason, the sliding durability is inferior when combined with the pseudo contact type head.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記に鑑み提
案されたもので、耐久性に優れた潤滑層組成を選択する
ことにより長年月の使用に耐える高記録密度の磁気記録
媒体を提供することを目的とするものであって、非磁性
基板上に少なくとも強磁性薄膜層と保護膜層とを設けた
磁気記録媒体において、保護膜層は炭素系又は酸化セラ
ミックス系のうちから選択されるものであり、該保護膜
層の表面に化学式SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and provides a high-density magnetic recording medium that can withstand years of use by selecting a lubricating layer composition having excellent durability. In a magnetic recording medium provided with at least a ferromagnetic thin film layer and a protective film layer on a non-magnetic substrate, the protective film layer is selected from carbon-based or ceramic oxide-based And a chemical formula on the surface of the protective film layer.
【化７】 で表される含フッ素化合物（以下、第一の含フッ素化合
物という）と、化学式Embedded image And a fluorine-containing compound represented by the following formula (hereinafter referred to as a first fluorine-containing compound)
【化８】 で表される含フッ素化合物（以下、第二の含フッ素化合
物という）とを混合した潤滑層を有することを特徴とす
る。Embedded image (Hereinafter, referred to as a second fluorine-containing compound).
【０００９】[0009]
【発明の実施の形態】本発明における潤滑層に用いられ
る第一の含フッ素化合物は、前記従来の技術にて説明し
た商品名「フォンブリン ゼットドール（FOMBLIN ZDO
L）」〔アウジモント（AUSIMONT）社製〕をそのまま用
いることができ、前記のように分子の両末端の極性官能
基が炭素系、又は酸化物セラミックス系の保護膜層との
間に高い結合性を示し、優れた摺動特性が付与されると
いう利点を有するものである。その反面、磁気ヘッドの
スライダー部分の構成成分である酸化アルミニウムが触
媒となり、分解し易く、分解した成分が揮発して潤滑層
の膜厚が減少することにより、動摩擦係数が増大し、そ
の結果、高速の接触摺動に起因する摩耗損傷や磁気特性
の劣化が生じ易いという欠点がある。また、第二の含フ
ッ素化合物についても、前記商品名「フォンブリン ゼ
ットテトラオール」（アウジモント社製）をそのまま用
いることができ、前記のように極性官能基の多座配位構
造によりヘッドのスライダー部の酸化アルミニウムとの
接触反応（分解）が緩和され、化学的に安定であり、そ
の両末端の極性官能基が炭素系、又は酸化物セラミック
ス系の保護膜との間に高い親和性を示し、スピンオフ性
の向上に寄与するので、安定性に優れているという利点
を有するものである。その反面、両末端の極性官能基と
炭素系、又は酸化物セラミックス系の保護膜との間の親
和性が高過ぎて、耐久性向上に寄与する潤滑層の上側の
自由に動ける潤滑剤成分がほとんどなく、疑似接触型の
ヘッドのとの組み合わせでは摺動耐久性が劣るという欠
点がある。これら第一の含フッ素化合物と第二の含フッ
素化合物との混合潤滑層は、両者を適当な割合に混合す
ることによって、前記第一の含フッ素化合物の欠点であ
る接触分解がなくなり、且つ第二の含フッ素化合物の欠
点である摺動特性を克服することができる。このため、
長期安定性、摺動耐久性に優れている。しかも、単に二
種類の含フッ素化合物の特性が組み合わされるばかりで
なく、特異的に動摩擦係数及び静摩擦係数が低いものが
得られることが見いだされた。その結果、磁気記録媒体
の信頼性が飛躍的に向上する。BEST MODE FOR CARRYING OUT THE INVENTION The first fluorine-containing compound used in the lubricating layer in the present invention is the product name "FOMBLIN ZDO Doll" described in the above-mentioned prior art.
L) "(manufactured by AUSIMONT) can be used as it is, and as described above, the polar functional groups at both ends of the molecule have a high binding property with the carbon-based or oxide ceramic-based protective film layer. And has the advantage that excellent sliding characteristics are imparted. On the other hand, aluminum oxide, which is a component of the slider portion of the magnetic head, acts as a catalyst and is easily decomposed, and the decomposed component is volatilized to reduce the thickness of the lubricating layer, thereby increasing the coefficient of kinetic friction. There is a drawback that abrasion damage and deterioration of magnetic properties due to high-speed contact sliding are likely to occur. As the second fluorine-containing compound, the above-mentioned trade name “Fomblin Zet Tetraol” (manufactured by Ausimont) can be used as it is, and as described above, the head slider is formed by the polydentate structure of the polar functional group. The contact reaction (decomposition) with the aluminum oxide in the part is relaxed and chemically stable, and the polar functional groups at both ends show high affinity with the carbon-based or oxide ceramic-based protective film. It has the advantage of being excellent in stability because it contributes to improvement in spin-off properties. On the other hand, the affinity between the polar functional groups at both ends and the carbon-based or oxide ceramic-based protective film is too high, and the freely movable lubricant component on the upper side of the lubricating layer contributing to the improvement of the durability is generated. There is almost no drawback that the sliding durability is inferior in combination with a pseudo contact type head. The mixed lubricating layer of the first fluorinated compound and the second fluorinated compound, by mixing both in an appropriate ratio, eliminates the catalytic decomposition which is a disadvantage of the first fluorinated compound, and The sliding property, which is a disadvantage of the two fluorine-containing compounds, can be overcome. For this reason,
Excellent long-term stability and sliding durability. Moreover, it has been found that not only the characteristics of the two kinds of fluorine-containing compounds are simply combined, but also that the specific low dynamic friction coefficient and low static friction coefficient can be obtained. As a result, the reliability of the magnetic recording medium is dramatically improved.
【００１０】磁気記録媒体の更なる耐久性向上におい
て、第一の含フッ素化合物に対する第二の含フッ素化合
物の混合割合は、２５〜４００ｗｔ％であることが望ま
しい。第一の含フッ素化合物に対する第二の含フッ素化
合物の混合割合が２５ｗｔ％に満たないと長期安定性が
十分でなく、４００ｗｔ％を越えると摺動耐久性が十分
でない。尚、この潤滑層の形成方法、即ち前記潤滑剤の
塗付方法は、公知のディップ法、スピン法、スプレイ法
等のどの方法で行ってもよい。In order to further improve the durability of the magnetic recording medium, the mixing ratio of the second fluorinated compound to the first fluorinated compound is desirably 25 to 400 wt%. If the mixing ratio of the second fluorine-containing compound to the first fluorine-containing compound is less than 25 wt%, the long-term stability is not sufficient, and if it exceeds 400 wt%, the sliding durability is not sufficient. The method of forming the lubricating layer, that is, the method of applying the lubricant, may be performed by any known method such as a dipping method, a spin method, and a spray method.
【００１１】尚、本発明における保護膜層として炭素系
膜を用いる場合は、水素化或いは窒素化或いはフッ素化
した炭素膜を用いてもよい。また、酸化物系のセラミッ
クス系膜を用いる場合には、ＳｉＯ2 、ＺｒＯ2 を用い
ることが好ましい。When a carbon-based film is used as the protective film layer in the present invention, a hydrogenated, nitrogenated or fluorinated carbon film may be used. When an oxide ceramic film is used, it is preferable to use SiO 2 or ZrO 2 .
【００１２】[0012]
【実施例】〈試験用磁気ディスクの作製〉 ［実施例１］図１に、本発明に係るハードディスクの断
面図を示した。アルミニウム合金基板１上に硬質下地層
としてＮｉ−Ｐメッキ膜２が１３μｍ被覆され、次にス
パッタリング法により下地膜層３としてＣｒを６００
Å、磁気記録層（磁性膜）４としてＣｏ−Ｃｒ−Ｔａ合
金を４００Å、さらに保護膜層５としてカーボンを２０
０Å積層した。次に、潤滑剤として化学式EXAMPLES <Production of Test Magnetic Disk> [Example 1] FIG. 1 shows a sectional view of a hard disk according to the present invention. An aluminum alloy substrate 1 is coated with a Ni-P plating film 2 having a thickness of 13 μm as a hard underlayer.
{Co-Cr-Ta alloy 400 for the magnetic recording layer (magnetic film) 4} and carbon 20 for the protective film layer 5
0 ° laminated. Next, the chemical formula as a lubricant
【化９】 で表される数平均分子量２０００の第一の含フッ素化合
物と、化学式Embedded image A first fluorinated compound having a number average molecular weight of 2,000 represented by
【化１０】 で表される数平均分子量２０００の第二の含フッ素化合
物を、４：１の割合（重量比）で混合してフロン系溶剤
〔商品名「ＡＫ２２５」，旭硝子社製〕中に濃度０．０
６ｗｔ％となるように溶解して塗布用組成物を調製し
た。そして、前記保護膜層５の上面に、上記のように調
製した塗布用組成物をディップ法により膜厚２０Å（Ｅ
ＳＣＡを用いて測定）になるように塗布して潤滑層６を
形成し、実施例１の磁気ディスクを得た。Embedded image The second fluorine-containing compound having a number average molecular weight of 2,000 represented by the following formula is mixed at a ratio (weight ratio) of 4: 1 to a fluorocarbon solvent [trade name "AK225" manufactured by Asahi Glass Co., Ltd.] to a concentration of 0.02.
The composition for coating was prepared by dissolving to 6 wt%. Then, the coating composition prepared as described above was coated on the upper surface of the protective film layer 5 by a dipping method to a thickness of 20 ° (E).
(Measured using SCA) to form a lubricating layer 6 to obtain the magnetic disk of Example 1.
【００１３】［実施例２］第一の含フッ素化合物と第二
の含フッ素化合物の混合割合（重量比）を２：１にした
以外は前記実施例１と同様にして実施例２の磁気記録媒
体を得た。Example 2 The magnetic recording of Example 2 was performed in the same manner as in Example 1 except that the mixing ratio (weight ratio) of the first fluorine-containing compound and the second fluorine-containing compound was 2: 1. I got the medium.
【００１４】［実施例３］第一の含フッ素化合物と第二
の含フッ素化合物の混合割合（重量比）を３：２にした
以外は前記実施例１と同様にして実施例３の磁気記録媒
体を得た。Example 3 The magnetic recording of Example 3 was performed in the same manner as in Example 1 except that the mixing ratio (weight ratio) of the first fluorine-containing compound and the second fluorine-containing compound was 3: 2. I got the medium.
【００１５】［実施例４］第一の含フッ素化合物と第二
の含フッ素化合物の混合割合（重量比）を１：１にした
以外は前記実施例１と同様にして実施例４の磁気記録媒
体を得た。Example 4 The magnetic recording of Example 4 was performed in the same manner as in Example 1 except that the mixing ratio (weight ratio) of the first fluorine-containing compound and the second fluorine-containing compound was 1: 1. I got the medium.
【００１６】［実施例５］第一の含フッ素化合物と第二
の含フッ素化合物の混合割合（重量比）を１：２にした
以外は前記実施例１と同様にして実施例５の磁気記録媒
体を得た。Example 5 The magnetic recording of Example 5 was performed in the same manner as in Example 1 except that the mixing ratio (weight ratio) of the first fluorine-containing compound and the second fluorine-containing compound was 1: 2. I got the medium.
【００１７】［実施例６］第一の含フッ素化合物と第二
の含フッ素化合物の混合割合（重量比）を１：４にした
以外は前記実施例１と同様にして実施例６の磁気記録媒
体を得た。Example 6 The magnetic recording of Example 6 was performed in the same manner as in Example 1 except that the mixing ratio (weight ratio) of the first fluorine-containing compound and the second fluorine-containing compound was 1: 4. I got the medium.
【００１８】［比較例１］潤滑剤として化学式Comparative Example 1 Chemical formula as a lubricant
【化１１】 で表される数平均分子量２０００の第一の含フッ素化合
物を単独で用いた以外は前記実施例１と同様にして比較
例１の磁気記録媒体を得た。Embedded image The magnetic recording medium of Comparative Example 1 was obtained in the same manner as in Example 1 except that the first fluorine-containing compound having a number average molecular weight of 2,000 represented by was used alone.
【００１９】［比較例２］潤滑剤として化学式Comparative Example 2 Chemical Formula as Lubricant
【化１２】 で表される数平均分子量２０００の第二の含フッ素化合
物を単独で用いた以外は前記実施例１と同様にして比較
例２の磁気記録媒体を得た。Embedded image A magnetic recording medium of Comparative Example 2 was obtained in the same manner as in Example 1 except that the second fluorine-containing compound having a number average molecular weight of 2000 represented by the following formula was used alone.
【００２０】〈試験１；長期安定性テスト〉前記実施例
１〜６、比較例１，２に用いた各含フッ素化合物に触媒
として、Ａｌ2 Ｏ3 を添加し、２５０℃に加熱した。表
１に加熱をはじめて４時間後の重量減少量を示した。<Test 1: Long-term stability test> Al 2 O 3 was added as a catalyst to each of the fluorine-containing compounds used in Examples 1 to 6 and Comparative Examples 1 and 2, and heated to 250 ° C. Table 1 shows the weight loss 4 hours after the first heating.
【表１】 上記表１より明らかなように、実施例１〜６及び比較例
２に用いた各フッ素化合物については重量減が殆ど観察
されなかったのに対し、比較例１に用いた含フッ素化合
物については殆どが分解して蒸発してしまった。[Table 1] As is evident from Table 1 above, while weight loss was hardly observed for each of the fluorine compounds used in Examples 1 to 6 and Comparative Example 2, the fluorine-containing compound used in Comparative Example 1 was almost unresolved. Decomposed and evaporated.
【００２１】〈試験２；ボンデッド比測定・保護膜との
密着性の測定〉前記実施例１〜６、比較例１，２の各磁
気ディスクをＥＳＣＡにより半径２０ｍｍにおける膜厚
を測定した。その後、ディスクをフッ素系溶剤〔商品名
「ＰＦ５０５２」，ミネソタ マイニング アンド マ
ニュファクチュアリング社製〕中に１５分間浸漬し、取
り出した後、再度ＥＳＣＡにより半径２０ｍｍにおける
膜厚を測定した。フッ素系溶剤「５０５２」に浸漬前後
の膜厚の比（ボンデッド比）を求め、この値を表１に示
した。前記表１より明らかなように、比較例１の磁気デ
ィスクではボンデッド比が非常に小さく、潤滑剤の中で
保護膜と強固に結合しているのは２割程度しかないこと
が分かる。実施例１〜６及び比較例２の各磁気ディスク
についてはボンデッド比が５５％以上あり、潤滑剤の中
で保護膜と強固に結合している成分が多いことを示して
いる。<Test 2: Measurement of Bonding Ratio / Measurement of Adhesion with Protective Film> The magnetic disks of Examples 1 to 6 and Comparative Examples 1 and 2 were measured for film thickness at a radius of 20 mm by ESCA. Thereafter, the disk was immersed in a fluorine-based solvent (trade name “PF5052”, manufactured by Minnesota Mining and Manufacturing Co., Ltd.) for 15 minutes, taken out, and the film thickness at a radius of 20 mm was measured again by ESCA. The film thickness ratio (bonded ratio) before and after immersion in the fluorine-based solvent “5052” was determined, and this value is shown in Table 1. As is clear from Table 1, the bonded ratio of the magnetic disk of Comparative Example 1 is very small, and only about 20% of the lubricant is firmly bonded to the protective film. Each of the magnetic disks of Examples 1 to 6 and Comparative Example 2 had a bonded ratio of 55% or more, indicating that many components strongly bonded to the protective film in the lubricant.
【００２２】〈試験３；ＣＳＳ耐久性テスト−動摩擦係
数の測定〉前記実施例１〜６、比較例１，２の各磁気デ
ィスクのＣＳＳ（Contact-Start-Stop）試験を行った。
ＣＳＳ試験機には市販のＣＳＳテスター（マツボー社
製）を、磁気ヘッドにはＡｌ2 Ｏ3 −ＴｉＣスライダー
ヘッドを用いて１００００回のＣＳＳを行った。１００
００回後の動摩擦係数の値を表１に示した。前記表１よ
り明らかなように、実施例１〜６の各磁気ディスクにつ
いては動摩擦係数がＣＳＳ１００００回の後でも約０．
３と低いが、比較例１，２の各磁気ディスクでは動摩擦
係数が０．６〜１．２と高い値を示していた。<Test 3: CSS Durability Test—Measurement of Dynamic Friction Coefficient> The magnetic disks of Examples 1 to 6 and Comparative Examples 1 and 2 were subjected to a CSS (Contact-Start-Stop) test.
A commercially available CSS tester (manufactured by Matsubo) was used for the CSS tester, and 10,000 times of CSS was performed using an Al 2 O 3 —TiC slider head for the magnetic head. 100
Table 1 shows the values of the coefficient of kinetic friction after 00 times. As is evident from Table 1, the dynamic friction coefficient of each of the magnetic disks of Examples 1 to 6 was about 0.5 even after 10,000 times of CSS.
3, but the magnetic disks of Comparative Examples 1 and 2 exhibited a high dynamic friction coefficient of 0.6 to 1.2.
【００２３】〈試験４；ＣＳＳ耐久性テスト−静摩擦係
数の測定〉前記実施例１〜６、比較例１，２の各磁気デ
ィスクのＣＳＳ（Contact-Start-Stop）試験を行った。
ＣＳＳ試験機には市販のＣＳＳテスター（マツボー社
製）を、磁気ヘッドにはＡｌ2 Ｏ3 −ＴｉＣスライダー
ヘッドを用いて４０℃，８０％ＲＨ雰囲気下で５０００
回のＣＳＳを行った。ディスクとヘッドを２４時間静置
させた後の静摩擦係数の値を表１に示した。前記表１よ
り明らかなように、実施例１〜６の各磁気ディスクにつ
いては静摩擦係数が０．７〜１．０と低いが、比較例の
磁気ディスクでは静摩擦係数が２〜４と高い値を示して
いた。<Test 4: CSS Durability Test—Measurement of Static Friction Coefficient> The magnetic disks of Examples 1 to 6 and Comparative Examples 1 and 2 were subjected to a CSS (Contact-Start-Stop) test.
A commercially available CSS tester (Matsubo Co., Ltd.) was used for the CSS tester, and an Al 2 O 3 —TiC slider head was used for the magnetic head.
Times CSS was performed. Table 1 shows the value of the coefficient of static friction after allowing the disk and the head to stand for 24 hours. As is clear from Table 1, the magnetic disks of Examples 1 to 6 have a low static friction coefficient of 0.7 to 1.0, but the magnetic disks of Comparative Examples have high static friction coefficients of 2 to 4. Was showing.
【００２４】尚、保護膜層として、ＳｉＯ2 、ＺｒＯ2
を用いた場合も同様に試験用磁気ディスクを作成して前
記試験３，４を行ったが、前記と同様の結果が得られ
た。The protective film layer is made of SiO 2 , ZrO 2
In the same manner as above, a test magnetic disk was prepared in the same manner, and the tests 3 and 4 were performed. The same results as above were obtained.
【００２５】以上本発明を実施例に基づいて説明した
が、本発明は上記実施例に限定されるものではなく、特
許請求の範囲に記載の構成を変更しない限りどのように
でも実施することができる。Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be implemented in any manner unless the configuration described in the claims is changed. it can.
【００２６】[0026]
【発明の効果】以上説明したように本発明の磁気記録媒
体は、優れた潤滑性及び耐摩耗性を有し、しかも長期間
に亙って高温でも化学的に安定な潤滑層を精選したの
で、特にヘッドの低浮上化に対応した平滑な基板を用い
た場合にも、良好な摺動耐久性と長期に亙る十分な安定
性とを有するものとなる。したがって、本発明の磁気記
録媒体は、データ記録密度を増大させることが可能とな
ると共に、長期にわたり信頼性の高いものとなる。As described above, the magnetic recording medium of the present invention has excellent lubricity and abrasion resistance and has been carefully selected from a lubricating layer which is chemically stable over a long period of time even at a high temperature. In particular, even when a smooth substrate corresponding to the low flying height of the head is used, good sliding durability and sufficient stability for a long period are obtained. Therefore, the magnetic recording medium of the present invention can increase the data recording density and has high reliability for a long time.
【図１】本発明に係るハードディスクの一例を模式的に
示す断面図である。FIG. 1 is a sectional view schematically showing an example of a hard disk according to the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高梨 幸代 千葉県市原市八幡海岸通５−１ 昭和電工 株式会社ＨＤ工場内 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Sachiyo Takanashi 5-1 Yawata Kaigandori, Ichihara-shi, Chiba Prefecture Showa Denko Corporation HD Plant
Claims (2)
と保護膜層とを設けた磁気記録媒体において、 保護膜層は炭素系又は酸化セラミックス系のうちから選
択されるものであり、該保護膜層の表面に化学式 【化１】 で表される含フッ素化合物と、化学式 【化２】 で表される含フッ素化合物とを混合した潤滑層を有する
ことを特徴とする磁気記録媒体。1. A magnetic recording medium having at least a ferromagnetic thin film layer and a protective film layer provided on a non-magnetic substrate, wherein the protective film layer is selected from carbon-based or ceramic oxide-based. Chemical formula on the surface of the film layer And a fluorine-containing compound represented by the formula: A magnetic recording medium comprising a lubricating layer mixed with a fluorine-containing compound represented by the formula:
の 【化４】 で表される含フッ素化合物を含んでなることを特徴とす
る請求項１に記載の磁気記録媒体。2. The lubricating layer comprises: 25 to 400% by weight based on the fluorine-containing compound represented by
Of 2. The magnetic recording medium according to claim 1, comprising a fluorine-containing compound represented by the following formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29503996A JP3223238B2 (en) | 1996-11-07 | 1996-11-07 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29503996A JP3223238B2 (en) | 1996-11-07 | 1996-11-07 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10143838A true JPH10143838A (en) | 1998-05-29 |
| JP3223238B2 JP3223238B2 (en) | 2001-10-29 |
Family
ID=17815539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29503996A Expired - Lifetime JP3223238B2 (en) | 1996-11-07 | 1996-11-07 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3223238B2 (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6911420B2 (en) | 2001-10-24 | 2005-06-28 | Fuji Electric Co., Ltd. | Method of refining a lubricant for use on a magnetic recording medium |
| US6994924B2 (en) | 2001-10-18 | 2006-02-07 | Fuji Electric Co., Ltd. | Magnetic recording medium and manufacture method therefor |
| JP2006137904A (en) * | 2004-11-15 | 2006-06-01 | Fujitsu Ltd | Composition, magnetic recording medium, head slider and magnetic recording apparatus |
| US7105241B2 (en) | 2003-03-31 | 2006-09-12 | Hoya Corporation | Magnetic disk and method of manufacturing same |
| JP2007250058A (en) * | 2006-03-15 | 2007-09-27 | Fuji Electric Device Technology Co Ltd | Magnetic disk medium for contact magnetic recording system and fixed magnetic recording device using the same |
| WO2010116908A1 (en) * | 2009-03-28 | 2010-10-14 | Hoya株式会社 | Lubricant compound for magnetic disk and magnetic disk |
| US8012920B2 (en) | 2004-01-14 | 2011-09-06 | Wd Media (Singapore) Pte. Ltd. | Lubricant for magnetic disks, method for producing the lubricant used in the magnetic disks, and method for manufacturing the same |
| US8445123B2 (en) | 2008-03-19 | 2013-05-21 | Fuji Electric Co., Ltd. | Lubricant for magnetic recording media, and magnetic recording medium using the lubricant |
| US8828565B2 (en) | 2011-03-07 | 2014-09-09 | Fujifilm Corporation | Lubricant composition, fluorine-based compound, and use thereof |
| US9117475B2 (en) | 2009-03-25 | 2015-08-25 | Fujifilm Corporation | Lubricant composition and use thereof |
| WO2017145995A1 (en) * | 2016-02-22 | 2017-08-31 | 昭和電工株式会社 | Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium |
| US10068603B2 (en) | 2007-09-14 | 2018-09-04 | Fuji Electric Co., Ltd. | Magnetic recording medium |
| WO2019087548A1 (en) * | 2017-10-31 | 2019-05-09 | 昭和電工株式会社 | Fluorine-containing ether compound, lubricant for magnetic recording media, and magnetic recording medium |
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1996
- 1996-11-07 JP JP29503996A patent/JP3223238B2/en not_active Expired - Lifetime
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|---|---|---|---|---|
| US6994924B2 (en) | 2001-10-18 | 2006-02-07 | Fuji Electric Co., Ltd. | Magnetic recording medium and manufacture method therefor |
| US6911420B2 (en) | 2001-10-24 | 2005-06-28 | Fuji Electric Co., Ltd. | Method of refining a lubricant for use on a magnetic recording medium |
| US7105241B2 (en) | 2003-03-31 | 2006-09-12 | Hoya Corporation | Magnetic disk and method of manufacturing same |
| US8012920B2 (en) | 2004-01-14 | 2011-09-06 | Wd Media (Singapore) Pte. Ltd. | Lubricant for magnetic disks, method for producing the lubricant used in the magnetic disks, and method for manufacturing the same |
| JP2006137904A (en) * | 2004-11-15 | 2006-06-01 | Fujitsu Ltd | Composition, magnetic recording medium, head slider and magnetic recording apparatus |
| US7534750B2 (en) | 2004-11-15 | 2009-05-19 | Fujitsu Limited | Composition, magnetic recording medium, head slider, and magnetic recording device |
| JP2007250058A (en) * | 2006-03-15 | 2007-09-27 | Fuji Electric Device Technology Co Ltd | Magnetic disk medium for contact magnetic recording system and fixed magnetic recording device using the same |
| JP4529925B2 (en) * | 2006-03-15 | 2010-08-25 | 富士電機デバイステクノロジー株式会社 | Magnetic disk medium for contact magnetic recording system and fixed magnetic recording apparatus using the same |
| US10068603B2 (en) | 2007-09-14 | 2018-09-04 | Fuji Electric Co., Ltd. | Magnetic recording medium |
| US8445123B2 (en) | 2008-03-19 | 2013-05-21 | Fuji Electric Co., Ltd. | Lubricant for magnetic recording media, and magnetic recording medium using the lubricant |
| US9117475B2 (en) | 2009-03-25 | 2015-08-25 | Fujifilm Corporation | Lubricant composition and use thereof |
| WO2010116908A1 (en) * | 2009-03-28 | 2010-10-14 | Hoya株式会社 | Lubricant compound for magnetic disk and magnetic disk |
| US9558778B2 (en) * | 2009-03-28 | 2017-01-31 | Wd Media (Singapore) Pte. Ltd. | Lubricant compound for magnetic disk and magnetic disk |
| US20120127601A1 (en) * | 2009-03-28 | 2012-05-24 | Wd Media (Singapore) Pte. Ltd. | Lubricant compound for magnetic disk and magnetic disk |
| US8828565B2 (en) | 2011-03-07 | 2014-09-09 | Fujifilm Corporation | Lubricant composition, fluorine-based compound, and use thereof |
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| US11180457B2 (en) | 2017-10-31 | 2021-11-23 | Showa Denko K. K. | Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium |
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