JPS63106917A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63106917A JPS63106917A JP13305087A JP13305087A JPS63106917A JP S63106917 A JPS63106917 A JP S63106917A JP 13305087 A JP13305087 A JP 13305087A JP 13305087 A JP13305087 A JP 13305087A JP S63106917 A JPS63106917 A JP S63106917A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- layer
- 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.)
- Granted
Links
- 239000011651 chromium Substances 0.000 claims abstract description 27
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 14
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 5
- 239000010941 cobalt Substances 0.000 claims abstract description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000010936 titanium Substances 0.000 abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 2
- 230000005415 magnetization Effects 0.000 abstract description 2
- 239000011733 molybdenum Substances 0.000 abstract description 2
- 229910052715 tantalum Inorganic materials 0.000 abstract description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000010408 film Substances 0.000 description 15
- 230000001681 protective effect Effects 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 229910018487 Ni—Cr Inorganic materials 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000005361 soda-lime glass Substances 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910018106 Ni—C Inorganic materials 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気記録に用いられる磁気ディスク、磁気ド
ラム、磁気テープ、磁気カード等の磁気記録媒体に関づ
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic recording media used for magnetic recording, such as magnetic disks, magnetic drums, magnetic tapes, and magnetic cards.
従来、この種の磁気記録媒体としては、非磁性支持体上
に、Ｃｒからなる下地層（膜厚： ２５００人）及びＣ
ｏ−Ｎｉ−Ｃｒからなる磁性層（膜厚：６００人）を順
次積層したものや、非磁性支持体ヒに、Ｎ１−Ｐ合金か
らなるメッキ膜、ｐｔとＮ１を含有するＣＯ合金からな
る磁性層及びＳｉＯ２膜を順次積層したもの（特開昭５
９−６１１０６号公報）があった。Conventionally, this type of magnetic recording medium consists of an underlayer made of Cr (thickness: 2,500 yen) and Cr on a non-magnetic support.
Magnetic layers (thickness: 600 layers) made of o-Ni-Cr are sequentially laminated, plated films made of N1-P alloy on a non-magnetic support, magnetic layers made of CO alloy containing PT and N1. layer and SiO2 film are sequentially laminated (Japanese Unexamined Patent Publication No. 5
9-61106).
しかしながら、従来の磁気記録媒体は、次のような問題
点があった。すなわち、Ｃｒからなる下地層とＣｏ−旧
−Ｃｒからなる磁性層とを有する磁気記録媒体では、保
磁力（Ｈｃ）を向上ざＶるためには、Ｃｒ下地層の膜厚
を厚くするか、または磁性層の膜厚を薄くする必要があ
る。しかし、Ｃｒ下地層は膜厚５０００人程度でｔｌｃ
の増加は飽和してしまい、単に膜厚を厚くしてもＨｃは
向上しない。・一方、磁気記録媒体に記録された情報の
再生時の出力が、残留磁化（１４ｒ）と磁性層の膜厚（
Ｔ）との積（以下、［ＨｒｒＪという。）に比例するこ
とから、Ｃｏ−Ｎｉ−Ｃｒからなる磁性層の膜厚を薄く
してｔｉｃを高める場合、この磁性層の膜厚を蒲クシす
ぎると前述した再生時の出力に支障が生じる。したがっ
て、磁性層の膜厚（Ｔ）を薄クシてＨｃを高めることに
も限界がある。However, conventional magnetic recording media have the following problems. That is, in a magnetic recording medium having an underlayer made of Cr and a magnetic layer made of Co-old-Cr, in order to improve the coercive force (Hc), it is necessary to increase the thickness of the Cr underlayer or to increase the thickness of the Cr underlayer. Alternatively, it is necessary to reduce the thickness of the magnetic layer. However, the Cr underlayer has a film thickness of about 5,000 tlc.
The increase in Hc reaches saturation, and simply increasing the film thickness does not improve Hc.・On the other hand, the output when reproducing information recorded on a magnetic recording medium depends on the residual magnetization (14r) and the thickness of the magnetic layer (
T) (hereinafter referred to as [HrrJ)]. Therefore, if the thickness of the magnetic layer made of Co-Ni-Cr is made thinner to increase the tic, the thickness of the magnetic layer may be too large. This causes the aforementioned problem with the output during playback. Therefore, there is a limit to increasing Hc by reducing the thickness (T) of the magnetic layer.
例えば、近年要求されている３、 ７ｘ １０’ （ｅ
ａ＋ｕ ／ｃｉ ）以上のＨｒＴを得ようとすると、Ｈ
ｒＴと同様に要求されている９００（Ｏｅ）以上のＩＩ
ｃを得ることは困難であった。For example, 3, 7x 10' (e
When trying to obtain HrT greater than a+u/ci), H
II of 900 (Oe) or higher, which is required similarly to rT.
It was difficult to obtain c.
また、ｃｏ−Ｎｔ−ｐｔからなる磁性層は、前述したＣ
。Further, the magnetic layer made of co-Nt-pt is made of the above-mentioned C
.
−Ｎｉ−Ｃｒからなる磁性層よりも耐湿性が劣ることか
ら、良好な磁気記録媒体を得ることができなかった。ま
た、前述した値のｌｌｃ及びＨｒＴを得るためには、ｐ
ｔの含有率を１０〜２５原子％の範囲しか選択できず製
造コストの低減を行なうことができなかった。Since the moisture resistance was inferior to that of a magnetic layer made of -Ni-Cr, a good magnetic recording medium could not be obtained. In addition, in order to obtain the above-mentioned values of llc and HrT, p
The content of t could only be selected within the range of 10 to 25 atom %, making it impossible to reduce manufacturing costs.
本発明は前述した問題点を除去するためになされたもの
で、その特徴は、非磁性支持体上に磁性層を設けた磁気
記録媒体において、前記非磁性支持体と前記磁性層との
間に下地層を設け、前記磁性層が、コバルト（ＣＯ）、
ニッケル（Ｎｉ）、クロム（Ｃｒ）及び白金（ｐｔ）か
らなり、かつ前記白金が１〜４３原子％含有している磁
気記録媒体である。The present invention has been made to eliminate the above-mentioned problems, and is characterized in that in a magnetic recording medium in which a magnetic layer is provided on a non-magnetic support, there is a gap between the non-magnetic support and the magnetic layer. An underlayer is provided, and the magnetic layer is made of cobalt (CO),
This magnetic recording medium is made of nickel (Ni), chromium (Cr), and platinum (pt), and contains 1 to 43 atomic percent of the platinum.
本発明の実施態様は、下地層の膜厚が５００Å以上であ
り、かつ磁性層の膜厚が４００〜１０００人であること
、また下地層がクロム（Ｃｒ）、モリブデン（Ｎｏ）、
チタン（Ｔｉ）、タンタル（Ｔａ）等の非磁性材料から
なることである。In an embodiment of the present invention, the thickness of the underlayer is 500 Å or more, and the thickness of the magnetic layer is 400 to 1000 Å, and the underlayer is made of chromium (Cr), molybdenum (No),
It is made of a non-magnetic material such as titanium (Ti) or tantalum (Ta).
本発明の一実施例を第１図に基づき詳細に説明する。 An embodiment of the present invention will be described in detail based on FIG.
先ず、ソーダライムガラスからなる非磁性支持体１の一
主表面上に、Ｃｒをターゲットとして、非磁性支持体１
の温度を室温とし、Ａｒガス雰囲気（Ａｒガス圧： ６
Ｘ １０−’Ｐａ）中でマグネトロンスパッタリング
法で、Ｃｒからなる非磁性の下地層２（膜厚： ３００
０人）を成膜する。次にＣｏ、Ｎｉ、Ｃｒ、及びｐｔか
らなる合金をターゲットとし、下地層２を成膜したとき
と同様にマグネトロンスパッタリング法でＣｏ、Ｎｉ、
Ｃｒ及びｐｔからなる磁性層３（膜厚は６００人で、Ｃ
ｏ、Ｎｉ、Ｃｒ及びｐｔのそれぞれの含有率（原子％）
は、６９．０．２４．３．４．９及び１．８である。First, on one main surface of the non-magnetic support 1 made of soda lime glass, the non-magnetic support 1 is coated with Cr as a target.
temperature is room temperature, Ar gas atmosphere (Ar gas pressure: 6
A nonmagnetic underlayer 2 made of Cr (thickness: 300
0 people) to form a film. Next, using an alloy consisting of Co, Ni, Cr, and pt as a target, Co, Ni, and
Magnetic layer 3 made of Cr and pt (thickness is 600 mm, C
o, Ni, Cr and pt content (atomic %)
are 69.0.24.3.4.9 and 1.8.
）を下地層２上に積層する。なお、この下地層２は、こ
の上に積層する磁性層３の結晶構造を制御する作用をす
る。次に、この磁性ｖｉａ上に、炭素（Ｃ）をターゲッ
トとし、前述したマグネトロンスパッタリング法で、Ｃ
からなる保護膜４（膜厚：３００人）を積層し、磁気記
録媒体５を製作する。) is laminated on the base layer 2. Note that this underlayer 2 functions to control the crystal structure of the magnetic layer 3 laminated thereon. Next, using carbon (C) as a target on this magnetic via, carbon
A magnetic recording medium 5 is manufactured by laminating a protective film 4 (thickness: 300 layers) consisting of:
次に、前述した磁気記録媒体５の保磁力（Ｈｃ）及びＭ
ｒＴを次の表に示す。なお、Ｃｏ、Ｎｉ、Ｃｒ及びｐｔ
の含有率の異なる他の実施例についてもシ１様に示す。Next, the coercive force (Hc) and M of the magnetic recording medium 5 described above are
rT is shown in the table below. In addition, Co, Ni, Cr and pt
Other examples with different content rates are also shown in Figure 1.
なお、比較例として、磁性層がＣｏ、Ｎｉ及びｐｔから
なるものであるとき（他の構成は本例と同様である。）
の保磁力１１ｃも示寸。Note that as a comparative example, the magnetic layer is made of Co, Ni, and pt (other configurations are the same as in this example).
The coercive force 11c of is also indicated.
また、前述した下地層２の膜厚を３０００人とし、磁性
ｆＩ３のｐｔ会右率を１〜４５原子％の範囲で変化させ
、残りのＣｏ、Ｎｉ、Ｃｒの含有率を原子比７０：２５
： ５で配分して含有さけた磁気記録媒体（保護膜も前
述したと同様に積層されている。）の保磁力とＨｒＴを
第２図に示す。なお、同図の線Ａは保磁力を示し、同図
の線ＢはＨｒＴを示ず。この図及び前述した表によれば
、ｐｔが１〜４３原子％の範囲でかつ下地層２を有して
いることから、保磁力は９００００以上が保たれ、か”
） ＭｒＴも３．７Ｘ １Ｏ−３８１ｔＪ／ｃｉ以Ｆと
なる。したがって、従来のＣｏ−Ｎｉ−Ｃｒからなる磁
性膜のときのように、保磁力を向上させる場合、磁性層
を助くする必要もなく、また薄くしても）１ｒＴ ハ３
．７ｘｌＯ−３ｅｍｕ／ｃｉ以上を維持スルコトができ
る。なお、第２図においては、Ｐ【の含有間１原子％未
満の保磁力を示していないが、１原子％未満であると急
激に低下する。また、ｐｔの範囲を広くとることができ
ることから、製造条件の管理を緩和することができ、か
つ従来のＣｏ−Ｎｉ−Ｐｔからなる磁性層よりもｐｔの
含有率を下げても（例えば１〜１０原子％）、所望する
保磁力及びＨｒＴが得られることから製造コストの低減
になる。さらに、この磁性層は、従来のＣｏ−Ｎｉ−Ｃ
ｒからなる磁性層よりも耐湿性が優れていた。Further, the thickness of the underlayer 2 mentioned above was set to 3000, the PT ratio of the magnetic fI3 was varied in the range of 1 to 45 at%, and the content of the remaining Co, Ni, and Cr was adjusted to an atomic ratio of 70:25.
FIG. 2 shows the coercive force and HrT of the magnetic recording medium (the protective film is also laminated in the same manner as described above) in which the content was avoided by distributing the amount of 5:5. Note that line A in the same figure indicates coercive force, and line B in the same figure does not indicate HrT. According to this figure and the table mentioned above, since the pt is in the range of 1 to 43 atomic % and the underlayer 2 is present, the coercive force is maintained at 90,000 or more.
) MrT is also 3.7X 1O-381tJ/ci or more F. Therefore, when improving the coercive force as in the case of a conventional magnetic film made of Co-Ni-Cr, there is no need to improve the magnetic layer, and even if it is thinned (1rT)
．． It is possible to maintain 7xlO-3 emu/ci or higher. Although FIG. 2 does not show a coercive force of less than 1 atomic % when P is contained, the coercive force decreases rapidly when the content is less than 1 atomic %. In addition, since the range of pt can be widened, the control of manufacturing conditions can be relaxed, and even if the pt content is lower than that of the conventional magnetic layer made of Co-Ni-Pt (for example, 1 to 10 at. Furthermore, this magnetic layer is similar to the conventional Co-Ni-C
It had better moisture resistance than a magnetic layer made of r.
本発明は前記実施例に限らず、下記のものであってもよ
い。先ず、非磁性支持体は、ソーダライムガラスからな
るものに限らず、アルミノシリケートガラス、石英ガラ
ス等の他のガラスや、Ａ１合金やセラミックであっても
よい。また、下地層はｃｒに限らず他の非磁性材料、例
えばＭｏ、Ｔｉ、■ａであってもよい。また、磁性層及
び下地層の膜厚は、ぞれぞれ６００人及び３０００人に
限るものではないが、望ましくは磁性層は４００人〜１
０００人で、かつ下地層は５００Å以上がよい。すなわ
ち、下地層が５００人未満であると、前述した保磁力が
９０００層未満及びＭｒＴが３．７ｘ １０−３ ｅｍ
ｕ／ｃｄ未満となる場合があり、一方、磁性層が４００
人〜１０００人の範囲外であると、前記した下地層と同
様な場合がある。なお、下地層の膜厚は５０００人を上
限とすると、さらに磁気記録媒体の製造コスト等の実用
性が向上する。The present invention is not limited to the above-described embodiments, but may include the following embodiments. First, the nonmagnetic support is not limited to soda lime glass, but may be other glasses such as aluminosilicate glass or quartz glass, A1 alloy, or ceramic. Further, the underlayer is not limited to Cr, but may be made of other non-magnetic materials, such as Mo, Ti, and (a). The thickness of the magnetic layer and the underlayer are not limited to 600 and 3000, respectively, but preferably the magnetic layer has a thickness of 400 to 1.
000 people, and the base layer preferably has a thickness of 500 Å or more. That is, when the underlayer is less than 500 layers, the above-mentioned coercive force is less than 9000 layers and MrT is 3.7x 10-3 em.
The magnetic layer may be less than 400 u/cd.
If the number is outside the range of 1,000 to 1,000 people, there may be cases similar to those of the base layer described above. Note that if the thickness of the underlayer is set at 5,000 layers as an upper limit, practicality such as manufacturing cost of the magnetic recording medium will be further improved.
また、前記実施例ではｐｔを除く、残りのＣｏ、Ｘｉ、
Ｃｒの含有率を原子比７０：２５：５で配分したが、他
の配分、例えば７６：１８：６であってもよい。また、
前記実施例では、保護膜を積層したがこれはなくてもよ
い。また保護膜を積層したとき、前記実施例ではＣから
なる保護膜であったが、これに限らずＳｉ０２やＣｉ機
重重合体らなる保護膜、さらに複合層、例えば、ｃｒ層
と０層とを当接して積層したもの、ｃｒ層とＳｉ０２層
とを当接して積層したもの、ＣｒＪｆｆｌとｃｌとＳｉ
０２層とからなりこれらを退官当接して積層したもの、
又前記複合層の材料を混合した混合層であってもよい。In addition, in the above embodiment, the remaining Co, Xi,
Although the Cr content was distributed at an atomic ratio of 70:25:5, other distributions may be used, for example, 76:18:6. Also,
In the above embodiment, a protective film is laminated, but this may be omitted. In addition, when the protective film is laminated, the protective film is made of C in the above embodiment, but the protective film is not limited to this, and the protective film is not limited to this, but may be made of Si02 or a Ci polymer, or a composite layer, for example, a CR layer and a 0 layer. Laminated in contact with each other, Cr layer and Si02 layer in contact with each other, CrJffl, cl and Si
It consists of 02 layers and is laminated with these layers in contact with each other.
Alternatively, it may be a mixed layer in which the materials of the composite layer are mixed.
また、前記実施例では、非磁性支持体上に下地層、磁性
層及び保護膜を順次積層したが、例えば、円板状の磁気
記録媒体（磁気ディスク）のとき、磁気ヘッドによる情
報の書き込み又は読み取り終了後、磁気ヘッドが配置さ
れるランディングゾーンを含む領域の、非磁性支持体と
下地層との間又は下地層と磁性層との間に磁性層や保護
膜層に凹凸を形成する層（例えばへ克薄膜）を設けても
よい。In the above embodiments, the underlayer, magnetic layer, and protective film were sequentially laminated on the nonmagnetic support. After reading is completed, a layer that forms irregularities on the magnetic layer or protective film layer ( For example, a thin film) may be provided.
本発明は前述したように１、非磁性支持体と磁性層との
間に下地層を設け、磁性層がＣｏ、Ｈｉ、Ｃｒ及びｐｔ
からなり、かつｐｔの含有率を１〜４３原子％であるこ
とから、良好な保磁力とＨｒＴを右する磁気記録媒体が
可能となった。As described above, the present invention provides 1. an underlayer between the nonmagnetic support and the magnetic layer, and the magnetic layer is made of Co, Hi, Cr, and pt.
and a pt content of 1 to 43 at. %, it has become possible to create a magnetic recording medium with good coercive force and good HrT.
第１図は本発明の磁気記録媒体の一実施例を示す断面図
であり、第２図は本発明の一実施例において磁性層のｐ
ｔ含有率を変化させたときの保磁力及びＨｒＴを示す特
性図である。FIG. 1 is a sectional view showing one embodiment of the magnetic recording medium of the present invention, and FIG. 2 is a cross-sectional view showing one embodiment of the magnetic recording medium of the present invention.
FIG. 3 is a characteristic diagram showing coercive force and HrT when the t content is changed.
Claims (3)
おいて、前記非磁性支持体と前記磁性層との間に下地層
を設け、前記磁性層が、コバルト、ニッケル、クロム及
び白金からなり、かつ前記白金が１〜４３原子％含有し
ていることを特徴とする磁気記録媒体。(1) In a magnetic recording medium in which a magnetic layer is provided on a non-magnetic support, an underlayer is provided between the non-magnetic support and the magnetic layer, and the magnetic layer is made of cobalt, nickel, chromium, and platinum. A magnetic recording medium characterized in that the platinum is contained in an amount of 1 to 43 atomic %.
の膜厚が４００〜１０００Åであることを特徴とする特
許請求の範囲第（１）項記載の磁気記録媒体。(2) The magnetic recording medium according to claim (1), wherein the underlayer has a thickness of 500 Å or more, and the magnetic layer has a thickness of 400 to 1000 Å.
からなることを特徴とする特許請求の範囲第（１）項又
は第（２）項記載の磁気記録媒体。(3) The magnetic recording medium according to claim (1) or (2), wherein the underlayer is made of a nonmagnetic material such as Cr, Mo, Ti, or Ta.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62133050A JPH0758540B2 (en) | 1986-06-27 | 1987-05-28 | Magnetic recording medium |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15114886 | 1986-06-27 | ||
| JP61-151148 | 1986-06-27 | ||
| JP62133050A JPH0758540B2 (en) | 1986-06-27 | 1987-05-28 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63106917A true JPS63106917A (en) | 1988-05-12 |
| JPH0758540B2 JPH0758540B2 (en) | 1995-06-21 |
Family
ID=26467487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62133050A Expired - Lifetime JPH0758540B2 (en) | 1986-06-27 | 1987-05-28 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0758540B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5180640A (en) * | 1990-10-01 | 1993-01-19 | Komag, Inc. | Magnetic recording medium comprising a magnetic alloy layer of cobalt nickel, platinum and chromium formed directly on a nickel alloy amorphous underlayer |
| US5536585A (en) * | 1993-03-10 | 1996-07-16 | Hitachi, Ltd. | Magnetic recording medium and fabrication method therefor |
| JP2007247741A (en) * | 2006-03-15 | 2007-09-27 | Ogino Kogyo Kk | Rocking gear device |
| US7927022B2 (en) | 2005-04-05 | 2011-04-19 | Nsk Ltd. | Thrust roller bearing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5911605A (en) * | 1982-06-28 | 1984-01-21 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Magnetic recording element |
| JPS62223813A (en) * | 1986-03-25 | 1987-10-01 | Hitachi Metals Ltd | Magnetic recording medium |
-
1987
- 1987-05-28 JP JP62133050A patent/JPH0758540B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5911605A (en) * | 1982-06-28 | 1984-01-21 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Magnetic recording element |
| JPS62223813A (en) * | 1986-03-25 | 1987-10-01 | Hitachi Metals Ltd | Magnetic recording medium |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5180640A (en) * | 1990-10-01 | 1993-01-19 | Komag, Inc. | Magnetic recording medium comprising a magnetic alloy layer of cobalt nickel, platinum and chromium formed directly on a nickel alloy amorphous underlayer |
| US5536585A (en) * | 1993-03-10 | 1996-07-16 | Hitachi, Ltd. | Magnetic recording medium and fabrication method therefor |
| US7927022B2 (en) | 2005-04-05 | 2011-04-19 | Nsk Ltd. | Thrust roller bearing |
| JP2007247741A (en) * | 2006-03-15 | 2007-09-27 | Ogino Kogyo Kk | Rocking gear device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0758540B2 (en) | 1995-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |