JPH0476811A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0476811A JPH0476811A JP18967090A JP18967090A JPH0476811A JP H0476811 A JPH0476811 A JP H0476811A JP 18967090 A JP18967090 A JP 18967090A JP 18967090 A JP18967090 A JP 18967090A JP H0476811 A JPH0476811 A JP H0476811A
- Authority
- JP
- Japan
- Prior art keywords
- coercive force
- magnetic recording
- recording medium
- magnetic
- electroless plating
- 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
- 238000007772 electroless plating Methods 0.000 claims abstract description 23
- 239000011669 selenium Substances 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 9
- 239000010941 cobalt Substances 0.000 claims abstract description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 9
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010408 film Substances 0.000 description 24
- 239000000203 mixture Substances 0.000 description 7
- 238000007747 plating Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 description 4
- 150000003841 chloride salts Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical class O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- RJTANRZEWTUVMA-UHFFFAOYSA-N boron;n-methylmethanamine Chemical compound [B].CNC RJTANRZEWTUVMA-UHFFFAOYSA-N 0.000 description 2
- 150000001869 cobalt compounds Chemical class 0.000 description 2
- 229910001429 cobalt ion Inorganic materials 0.000 description 2
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- -1 dicarboxylic acids Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001453 nickel ion Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229940065287 selenium compound Drugs 0.000 description 2
- 150000003343 selenium compounds Chemical class 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- SAXCKUIOAKKRAS-UHFFFAOYSA-N cobalt;hydrate Chemical compound O.[Co] SAXCKUIOAKKRAS-UHFFFAOYSA-N 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002816 nickel compounds Chemical class 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 description 1
- 229940074439 potassium sodium tartrate Drugs 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 235000011006 sodium potassium tartrate Nutrition 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Chemically Coating (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は磁気記録媒体に係り、特に磁気ディスク、フロ
ッピーディスク、磁気テープ等、の磁気記録装置に用い
られる磁気記録媒体であって、その磁気特性が改善され
た磁気記録媒体に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic recording medium, and in particular to a magnetic recording medium used in a magnetic recording device such as a magnetic disk, floppy disk, or magnetic tape. The present invention relates to a magnetic recording medium with improved characteristics.
［従来の技術］
磁気ディスク、フロッピーディスク、磁気テープ等の磁
気記録装置に用いられる磁気記録媒体には、近年、高記
録密度化の観点から、金属薄膜型の磁気記録媒体がバイ
ンダーを用いる塗布型の磁気記録媒体に代わって用いら
れ始めている。[Prior Art] In recent years, from the viewpoint of increasing recording density, magnetic recording media used in magnetic recording devices such as magnetic disks, floppy disks, and magnetic tapes have changed from metal thin film type magnetic recording media to coated type magnetic recording media using a binder. It is beginning to be used in place of magnetic recording media.
この金属薄膜型の磁気記録媒体は、無電解めっき、電気
めっき、スパッタ、蒸着等の方法で容易に作製される。This metal thin film type magnetic recording medium is easily produced by methods such as electroless plating, electroplating, sputtering, and vapor deposition.
これらのうち無電解めっき法は、高い生産性と長年の技
術蓄積による技術面の向上から、広く実用化が進められ
ている。Among these, the electroless plating method is being widely put into practical use due to its high productivity and technical improvements resulting from technology accumulation over many years.
従来、無電解めっき法により製造される磁気記録媒体は
、その磁性薄膜がＣｏ（コバルｈ ）−Ｐ（リン）又は
Ｃｏ −Ｎｉ にッケル）−Ｐよりなるものが主流であ
り、一部は既に製品化されている。Conventionally, the mainstream of magnetic recording media manufactured by electroless plating is that the magnetic thin film is made of Co (Cobal)-P (phosphorus) or Co-Ni (nickel)-P, and some of them have already been produced. It has been commercialized.
［発明が解決しようとする課題］
しかしながら、従来の無電解めっき法により無電解めっ
き浴を用いて磁性膜を作製する場合、同一浴組成で無電
解めっき浴を調製しても、使用する薬品の実際上管理不
可能なわずかな純度の差異によるめっき浴の組成誤差、
或いはめっき日数の経過によるめっき浴の組成変化、即
ち、めっき浴の消耗度合又はめっき浴の昇温、降温の繰
り返し回数によるめっき浴の組成変化により、得られる
磁性膜はその電磁変換特性に強く影響する保磁力が著し
く変化する現象が見られる。このようなことから、従来
においては特定の無電解めっき浴から、許容範囲内の保
磁力を有する磁性膜は、限られた数量しか得ることがで
きないという欠点があった。[Problems to be Solved by the Invention] However, when producing a magnetic film using an electroless plating bath using a conventional electroless plating method, even if the electroless plating bath is prepared with the same bath composition, the chemicals used are different. Plating bath composition errors due to slight purity differences that are practically unmanageable;
Alternatively, changes in the composition of the plating bath as the number of plating days passes, that is, changes in the composition of the plating bath due to the degree of depletion of the plating bath or the number of times the temperature of the plating bath is raised and lowered, strongly affect the electromagnetic conversion characteristics of the resulting magnetic film. A phenomenon in which the coercive force changes significantly is observed. For this reason, in the past, there was a drawback that only a limited number of magnetic films having a coercive force within an acceptable range could be obtained from a specific electroless plating bath.
本発明は上記従来の問題点を解決し、所望する保磁力角
形性の改良された比較的低い保磁力を有する磁気記録媒
体を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a magnetic recording medium having a relatively low coercive force and improved coercive force squareness as desired.
［課題を解決するための手段〕
本発明は、非磁性基板上に無電解めっき法によりコバル
ト系磁性膜が形成されてなる磁気記録媒体において、該
磁性膜がコバルトに対して０．０１〜５重量％のセレン
を含有することを特徴とする磁気記録媒体、に存する。[Means for Solving the Problems] The present invention provides a magnetic recording medium in which a cobalt-based magnetic film is formed on a nonmagnetic substrate by electroless plating, in which the magnetic film has a cobalt content of 0.01 to 5. % by weight of selenium.
以下に本発明の詳細な説明する。The present invention will be explained in detail below.
本発明の磁気記録媒体は非磁性基板上に無電解めっき法
によりコバルト系磁性膜が形成されてなる磁気記録媒体
において、該磁性膜がコバルトに対して０．０１〜５ｗ
ｔ％のＳｅを含有することを特徴とする。The magnetic recording medium of the present invention is a magnetic recording medium in which a cobalt-based magnetic film is formed on a non-magnetic substrate by electroless plating, in which the magnetic film has a cobalt content of 0.01 to 5 w.
It is characterized by containing t% of Se.
Ｓｅの量がＣｏに対して０．０１重量％未満であっても
、５重量％を越えても、十分な保磁力角形性の改善効果
は得られない。Ｓｅを含有量は特にＣｏに対して０．１
〜３重量％、とりわけ０．１〜１重量％であることが望
ましい。Even if the amount of Se is less than 0.01% by weight or more than 5% by weight relative to Co, a sufficient effect of improving coercive force squareness cannot be obtained. The Se content is especially 0.1 with respect to Co.
~3% by weight, especially 0.1-1% by weight is preferred.
本発明の磁気記録媒体は、非磁性基板上に無電解めっき
法により磁性膜が形成されてなるものである。無電解め
っき法は前述の如く生産性が高く、しかも長年の技術蓄
積がある点で極めて有利である。The magnetic recording medium of the present invention has a magnetic film formed on a nonmagnetic substrate by electroless plating. As mentioned above, the electroless plating method is extremely advantageous in that it has high productivity and has many years of accumulated technology.
無電解めっき浴中には、後述するように還元剤が用いら
れる。還元剤として、次亜リン酸塩、水素化ホウ素化合
物、ヒドラジン、ジメチルアミンボラン等が挙げられ、
好ましくは次亜リン酸塩が用いられる。A reducing agent is used in the electroless plating bath as described below. Examples of reducing agents include hypophosphites, borohydride compounds, hydrazine, dimethylamine borane, etc.
Preferably hypophosphite is used.
磁性膜は、還元剤に由来してＣｏ −Ｓｅ −Ｐ光磁性
膜あるいはＣｏ −Ｓｅ −Ｂ基磁性膜等となる。Ｐあ
るいはＢの含有量は、磁性膜のＣｏに対して１〜１０重
量％、特に２〜７重量％であることが望ましい。The magnetic film is a Co-Se-P photomagnetic film or a Co-Se-B based magnetic film, depending on the reducing agent. The content of P or B is preferably 1 to 10% by weight, particularly 2 to 7% by weight, based on Co in the magnetic film.
本発明の磁気記録媒体において、磁性膜中のＣ。In the magnetic recording medium of the present invention, C in the magnetic film.
量は、磁性膜の総重量に対して５０〜９８重量％、特に
７０〜９８重量％であることが望ましい。磁性膜は、更
にＣｏに対して０．１〜６０重量％、とりわけ１〜４０
重量％のＮｉを含有することが望ましい。The amount is preferably 50 to 98% by weight, particularly 70 to 98% by weight based on the total weight of the magnetic film. The magnetic film further contains 0.1 to 60% by weight, especially 1 to 40% by weight of Co.
It is desirable to contain % by weight of Ni.
無電解めっき浴中のコバルトイオン及びニッケルイオン
は水溶性化合物を用いて調製され、例えば、硫酸塩、塩
化物、硝酸塩、酢酸塩等の水溶性コバルト化合物又は水
溶性ニッケル化合物を用いて調製される。通常は硫酸塩
、塩化物が好適に用いられる。還元剤としては、次亜リ
ン酸塩、水素化ホウ素化合物、ヒドラジン、ジメチルア
ミンボラン等、好ましくは次亜リン酸塩が用いられる。The cobalt ions and nickel ions in the electroless plating bath are prepared using water-soluble compounds, for example, water-soluble cobalt compounds or water-soluble nickel compounds such as sulfates, chlorides, nitrates, acetates, etc. . Usually, sulfates and chlorides are preferably used. As the reducing agent, hypophosphites, borohydride compounds, hydrazine, dimethylamine borane, etc. are used, preferably hypophosphites.
錯化剤としては、ジカルボン酸、オキシカルボン酸、ア
ミノ酸等の有機酸及びそれらの可溶性塩から選ばれる１
種又は２種以上が適宜用いられる。なお、無電解めっき
浴中のコバルトイオン濃度は０．０１〜０，５モル／】
であることが好ましく、ニッケルイオン濃度は０．００
１−０．１モル／１であることが好ましい。The complexing agent is one selected from organic acids such as dicarboxylic acids, oxycarboxylic acids, and amino acids, and their soluble salts.
One species or two or more species may be used as appropriate. In addition, the cobalt ion concentration in the electroless plating bath is 0.01 to 0.5 mol/]
It is preferable that the nickel ion concentration is 0.00
It is preferable that it is 1-0.1 mol/1.
本発明の磁気記録媒体の磁性膜を形成するための無電解
めっき浴は、例えば、上記原料より調製される従来のＣ
ｏ−Ｐ光磁性膜の製造に用いる無電解めっき浴組成のも
のに、コバルト化合物の総量に対して０．０５〜１５モ
ル％のセレン化合物を添加することにより調製すること
ができる。ここで、セレン化合物としては、酸化物、硫
化物、塩化物、オキシ塩化物等が挙げられ、中でも酸化
物を用いることが好ましい。The electroless plating bath for forming the magnetic film of the magnetic recording medium of the present invention may be, for example, a conventional C plating bath prepared from the above raw materials.
It can be prepared by adding 0.05 to 15 mol % of a selenium compound based on the total amount of cobalt compounds to the electroless plating bath composition used for manufacturing the o-P photomagnetic film. Here, examples of the selenium compound include oxides, sulfides, chlorides, oxychlorides, etc. Among them, it is preferable to use oxides.
無電解めっき法による磁性膜の形成には、このようにし
て調製される無電解めっき浴を、苛性ソーダ又はアンモ
ニア化合物によりｐＨ８〜１１に調整し、また浴温を６
０〜９０℃に調整した後、非磁性基板を浸漬する。非磁
性基板の浸漬時間は目的とする磁性膜の厚さにより適宜
決定される。To form a magnetic film by electroless plating, the pH of the electroless plating bath thus prepared is adjusted to 8 to 11 with caustic soda or an ammonia compound, and the bath temperature is adjusted to 6.
After adjusting the temperature to 0 to 90°C, the nonmagnetic substrate is immersed. The immersion time of the nonmagnetic substrate is appropriately determined depending on the desired thickness of the magnetic film.
なお、磁性膜を形成する非磁性基板としては、金属、プ
ラスチック、セラミック、ガラス等の基板が用いられ、
通常、これらは公知の方法に従ってＮｉ −Ｐ無電解め
っき、Ｐｄ触媒化処理等の表面処理を施した後、磁性膜
の形成に供される。Note that as the non-magnetic substrate on which the magnetic film is formed, metal, plastic, ceramic, glass, etc. substrates are used.
Usually, these materials are subjected to surface treatments such as Ni--P electroless plating and Pd catalytic treatment according to known methods, and then used to form a magnetic film.
（作用］
本発明の磁気記録媒体はその保磁力角形性（Ｓ＊）を改
良し、かつ保磁力（Ｈｃ）を低下させる作用を有する。(Function) The magnetic recording medium of the present invention has the function of improving its coercive force squareness (S*) and lowering its coercive force (Hc).
従って、本発明の磁気記録媒体によれば、保磁力角形性
を改良し、容易に所望の保磁力を得ることができる。Therefore, according to the magnetic recording medium of the present invention, the coercive force squareness can be improved and a desired coercive force can be easily obtained.
［実施例１
以下に実施例及び比較例を挙げて本発明をより具体的に
説明するが、本発明はその要旨を超えない限り、以下の
実施例に限定されるものではない。[Example 1] The present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.
実施例１
硫酸コバルト０．０５ ｍｏｌハ、硫酸ニッケル０．０
１ ｍｏｌ／１、二酸化セレン０．０００１３ ｍｏｌ
ハ、次亜リン酸ナトリウム０．２０ ｍｏｌハ、ホウ酸
０．５０ ｍｏｌ ／ １．酒石酸カリウムナトリウム
０．５０ ｍｏｌハの組成を有する無電解めっき浴（２
５℃戸こ、苛性ソーダ溶液を加えｐＨを９．０に調整し
た。この浴を８０℃に加温し、常法に従って、脱脂、活
性化処理の前処理を施したＮ１−Ｐ無電解めっき被覆ア
ルミニウム基板を９０〜１２０秒浸漬して、磁性膜を形
成した。この磁性膜の組成はＣｏ ：９０重量％、Ｎｉ
：６重量％、Ｓｅ ：０．６重量％、Ｐ：３重量％で
あり、ＳｅはＣｏに対して０．７重量％含有されていた
。Example 1 Cobalt sulfate 0.05 mol, nickel sulfate 0.0
1 mol/1, selenium dioxide 0.00013 mol
C. Sodium hypophosphite 0.20 mol C. Boric acid 0.50 mol/1. Electroless plating bath having a composition of 0.50 mol of potassium sodium tartrate (2
At 5°C, a caustic soda solution was added to adjust the pH to 9.0. This bath was heated to 80° C., and an N1-P electroless plating coated aluminum substrate that had been pretreated with degreasing and activation was immersed in the bath for 90 to 120 seconds to form a magnetic film. The composition of this magnetic film is Co: 90% by weight, Ni
: 6% by weight, Se: 0.6% by weight, P: 3% by weight, and Se was contained in an amount of 0.7% by weight relative to Co.
得られた磁気記録媒体の保磁力（Ｈｅ）、角形性（Ｓ）
、保磁力角形性（Ｓ＊）を測定し、結果を第１表に示し
た。Coercive force (He) and squareness (S) of the obtained magnetic recording medium
The coercive force squareness (S*) was measured and the results are shown in Table 1.
比較例１
実施例１において、二酸化セレンを用いないほかは全く
同様にして磁性膜を形成し、得られた磁気記録媒体の保
磁力（Ｈｅ）、角形性（Ｓ）、保磁力角形性（８本）を
測定し、結果を第１表に示した。Comparative Example 1 A magnetic film was formed in exactly the same manner as in Example 1 except that selenium dioxide was not used, and the coercive force (He), squareness (S), and coercive force squareness (8 The results are shown in Table 1.
第１表
第１表より、本発明に係る磁気記録媒体は保磁力角形性
を改良し、かつ保磁力を低下させることができることが
明らかである。From Table 1, it is clear that the magnetic recording medium according to the present invention can improve the coercive force squareness and reduce the coercive force.
［発明の効果］
以上詳述した通り、本発明に係る磁気記録媒体によれば
、保磁力角形性が改良され、かつ保磁力を低下させるこ
とができる。このため、製造条件等の変動により保磁力
が許容範囲の上限を超えるような場合において、保磁力
を許容範囲内に容易に保つことが可能な磁気記録媒体が
提供される。[Effects of the Invention] As detailed above, according to the magnetic recording medium according to the present invention, the coercive force squareness can be improved and the coercive force can be reduced. Therefore, a magnetic recording medium is provided that can easily maintain the coercive force within the allowable range even when the coercive force exceeds the upper limit of the allowable range due to variations in manufacturing conditions or the like.
Claims (1)
磁性膜が形成されてなる磁気記録媒体において、該磁性
膜がコバルトに対して０．０１〜５重量％のセレンを含
有することを特徴とする磁気記録媒体。(1) A magnetic recording medium in which a cobalt-based magnetic film is formed on a nonmagnetic substrate by electroless plating, characterized in that the magnetic film contains 0.01 to 5% by weight of selenium based on cobalt. magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18967090A JPH0476811A (en) | 1990-07-18 | 1990-07-18 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18967090A JPH0476811A (en) | 1990-07-18 | 1990-07-18 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0476811A true JPH0476811A (en) | 1992-03-11 |
Family
ID=16245210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18967090A Pending JPH0476811A (en) | 1990-07-18 | 1990-07-18 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0476811A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5907952A (en) * | 1995-05-23 | 1999-06-01 | Komatsu Ltd. | Capacity control device for a hydraulic motor for a hydraulically driven vehicle |
-
1990
- 1990-07-18 JP JP18967090A patent/JPH0476811A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5907952A (en) * | 1995-05-23 | 1999-06-01 | Komatsu Ltd. | Capacity control device for a hydraulic motor for a hydraulically driven vehicle |
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