EP0408681A1 - Support d'enregistrement magnetique et son procede de fabrication - Google Patents

Support d'enregistrement magnetique et son procede de fabrication

Info

Publication number
EP0408681A1
EP0408681A1 EP89911807A EP89911807A EP0408681A1 EP 0408681 A1 EP0408681 A1 EP 0408681A1 EP 89911807 A EP89911807 A EP 89911807A EP 89911807 A EP89911807 A EP 89911807A EP 0408681 A1 EP0408681 A1 EP 0408681A1
Authority
EP
European Patent Office
Prior art keywords
layer
recording medium
protective layer
carbon
fluorine
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.)
Withdrawn
Application number
EP89911807A
Other languages
German (de)
English (en)
Inventor
Franz Josef LÖFFLER
Dietrich Stephani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0408681A1 publication Critical patent/EP0408681A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G11B5/725—Protective coatings, e.g. anti-static or antifriction containing a lubricant, e.g. organic compounds
    • G11B5/7253—Fluorocarbon lubricant
    • G11B5/7257—Perfluoropolyether lubricant

Definitions

  • the invention relates to a magnetic recording medium
  • At least one agnetizable storage layer on at least one flat side of the carrier body
  • a protective layer made of carbon or a carbon compound which covers the at least one storage layer
  • Such a recording medium is e.g. from the publication "Solid State Technology", October 1988, pages 113 to 115.
  • the invention further relates to methods for producing such a recording medium.
  • Corresponding recording media can be present, in particular, in the form of rigid magnetic storage disks or flexible individual disks (floppy discs).
  • a magnetic head which is adapted to the respective magnetization principle and which can be constructed in particular in thin-film technology is passed over them.
  • the distance between the magnetic head and the surface of the recording medium should be kept extremely small. They can be below 1 ⁇ m, for example in the case of vertical magnetization.
  • such short distances can practically only be ensured by designing a substrate carrying the magnetic head as a so-called missile, which aerodynamically slides over the recording medium.
  • the substrate is advantageously equipped on its underside facing the recording medium with corresponding glide or flight skids (cf., for example, EP-A-0 137 051).
  • the starting and landing phases of the substrate designed as a missile are particularly critical.
  • the storage layer has hitherto been coated with a thin protective layer made of a hard, abrasion-resistant material and, in addition, a thin layer of a friction-reducing lubricant or lubricant has been applied to its surface.
  • carbon can be found in the publication mentioned at the outset, which is applied, for example, by a sputtering process to the storage layer of a plate-shaped recording medium.
  • Protective silicon nitride layers cf. EP-A-0 175389
  • oxides, nitrides or carbides of cobalt or chromium cf. for example EP-A-0 186 358 are also provided.
  • lubricants examples include silicon dioxide (see, for example, EP-A-0 134412), hydrocarbon compounds (see, for example, DE-A-35 39 724) or fluorocarbon compounds (see, for example, EP-A-0 175) 389, EP-A-0 186 358 or the publication mentioned at the beginning). These lubricants are generally applied to the respective recording 1 medium separated. They are often referred to as Lubrikant.
  • the object of the present invention is now to design the recording medium of the type mentioned at the outset in such a way that the increase in the coefficient of friction due to the inhomogeneous wetting of the protective layer is at least largely eliminated.
  • fluorine is incorporated in the protective layer at least in a zone which adjoins the surface of the protective layer facing the lubricant layer.
  • the invention is based on the knowledge that with such incorporation of fluorine into the carbon material of the protective layer, so-called hydrophobization of the carbon surface, ie resistance to adsorption of Water molecules, is to be achieved.
  • hydrophobization of the carbon surface ie resistance to adsorption of Water molecules.
  • the result of this is that the surface is wetted with a liquid lubricant made from one of the known fluorine-carbon compounds in a much more uniform manner.
  • the previously observed increase in the coefficient of friction when a magnetic head comes into contact with the surface of this recording medium then advantageously no longer occurs.
  • a method for producing a recording medium according to the invention is characterized in that the carbon or the carbon compound of the protective layer is deposited on the storage layer at the same time as a fluorine-carbon compound.
  • FIG. 1 schematically shows a cross section through an inventive recording medium.
  • FIG. 2 shows the coefficient of friction of this recording medium to be determined in a start-stop test.
  • FIG. 1 schematically illustrates a cross section through part of a recording medium according to the invention.
  • the recording medium generally designated 2
  • the carrier body can be, for example, a hardened glass plate (cf. the
  • a storage layer 7 is applied, which is to be magnetized depending on the magnetization principle provided.
  • the storage layer 7 can have a layer 7a made of a cobalt-chromium alloy, which can be located on a lower layer 7b made of a soft magnetic material.
  • the storage layer 7 is covered with a hard, abrasion-resistant protective layer 9, which consists of carbon (C) or a carbon (C) compound.
  • This protective layer 9 has a thickness d between 5 nm and 100 n, preferably between 10 nm and 50 nm.
  • this protective layer should be in at least one zone 9a that connects to the Surface 10 adjacent to the protective layer, fluorine (F) must be installed.
  • the depth t of this zone 9a to be measured perpendicular to the flat side 4 should be at least 0.5 nm.
  • the surface 10 should advantageously be made extremely smooth and have a surface roughness of at most 70 nm, preferably at most 30 nm, based on the maximum roughness depth R t , based on a measuring distance of 2 mm.
  • the size R is a surface roughness of at most 70 nm, preferably at most 30 nm, based on the maximum roughness depth R t , based on a measuring distance of 2 mm.
  • a thin layer 11 of a liquid lubricant is applied wet to this smooth surface 10, for example by a dip coating process or by spraying.
  • they can be oily lubricants made from a perfluorinated ether of the general chemical formula R-CF 2 0- (C 2 F.0) - (CF 2 0) -CF 2 -R.
  • a protective layer 9 according to the invention on the upper flat side of the at least one storage layer 7: 1) With this process route the C or a C compound such as e.g. TiC, ZrC or WC deposited simultaneously with the F. Known chemical processes such as CVD are used for this purpose
  • sputtering process can be used particularly advantageously for this purpose. According to a specific exemplary embodiment for such a sputtering process, at a pressure of 5 to
  • FC connections suitable for this are in particular and CHF ,.
  • the addition can consist of one of these compounds. Mixtures of these compounds can also be added.
  • these volatile FC compounds can optionally also be used for other gaseous substances, for example be mixed with inert gases.
  • This procedure provides for the subsequent incorporation of the F into an already deposited preliminary layer of C or a C compound.
  • the preliminary layer initially formed by known processes is then physically or chemically post-treated such that the F penetrates into the layer from its free surface and is built into at least one zone 9a near the surface.
  • An RF plasma process can advantageously be provided for this, a plasma being formed with a volatile FC compound in accordance with process route 1), such as CF ⁇ .
  • post-treatment is at a pressure of 5 to 100. 10 " mbar of this FC connection and a power density of 0.1 to 3 W / cm 2 is possible.
  • the substrate carrier with the preliminary C-containing layer deposited on it is switched so that it is at a negative potential. Although a small part of the C-containing layer is etched off again, saturation of at least the layer surface with F is achieved.
  • the surfaces of the protective layers formed according to the two methods are distinguished by the fact that C and F, but no adsorbates with oxygen, can be detected on them during eye electron spectroscopic examinations. It is also advantageously achieved that the layers can be wetted well with perfluoropolyethers and these can be adsorbed well. In a subsequent dip coating process, it is therefore possible to apply a thin, continuous film of the lubricant which has good tribological properties (good sliding values).
  • the determination of the coefficient of friction of a magnetic storage disk designed according to the invention is possible by means of a start-stop test. The results of such a test are recorded in a diagram, as shown in FIG. 2.
  • the count z of the respective new starting process is plotted in the abscissa direction and the friction coefficient ⁇ in the ordinate direction.
  • the disk is driven in accordance with commercially available data storage systems, with a known read / write magnetic head made using thin-film technology being guided over it.
  • the magnetic head can slide aerodynamically over the plate rotating underneath it.
  • This behavior is tested over several 1000 cycles, the force required for starting being measured and the coefficient of friction being determined in this way. In between, the test is interrupted for a long time, with the magnetic head remaining on the disk.
  • the coefficient of static friction is then recorded.
  • the measures according to the invention allow an average value of the coefficient of friction ⁇ to be maintained which is clearly below the value of approximately 0.6 generally required by practice.

Abstract

Un support d'enregistrement (2) comprend une couche d'enregistrement magnétisable (7) recouverte d'une couche de protection (9) en carbone (C) ou en composé de carbone (C). Une couche antifriction (11) contenant un composé hydrocarbure fluoré est appliquée sur la couche de protection. Afin d'obtenir une bonne mouillabilité de la couche de protection, du fluor (F) est incorporé à au moins une des zones superficielles (9a) de la couche de protection (9) qui font face à la couche antifriction (11). Le fluor peut être incorporé simultanément avec la déposition de C ou du composé de C; ou l'on peut incorporer ultérieurement le fluor dans une couche temporaire de C ou de composé de C, à partir de sa surface libre.
EP89911807A 1988-12-07 1989-10-16 Support d'enregistrement magnetique et son procede de fabrication Withdrawn EP0408681A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP88120464 1988-12-07
EP88120464 1988-12-07

Publications (1)

Publication Number Publication Date
EP0408681A1 true EP0408681A1 (fr) 1991-01-23

Family

ID=8199638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911807A Withdrawn EP0408681A1 (fr) 1988-12-07 1989-10-16 Support d'enregistrement magnetique et son procede de fabrication

Country Status (2)

Country Link
EP (1) EP0408681A1 (fr)
WO (1) WO1990006575A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19622732C2 (de) * 1996-06-07 2000-04-13 Ibm Oberflächenmodifikation von Magnetköpfen
US8425982B2 (en) 2008-03-21 2013-04-23 Micron Technology, Inc. Methods of improving long range order in self-assembly of block copolymer films with ionic liquids

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665041A (en) * 1967-04-04 1972-05-23 Montedison Spa Perfluorinated polyethers and process for their preparation
DE3106184C2 (de) * 1981-02-19 1983-01-27 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Schmierung von Lagerstellen und Getriebeteilen
GB2166668B (en) * 1984-11-09 1988-03-09 Tdk Corp Magnetic recording medium
IT1185508B (it) * 1985-02-14 1987-11-12 Monfefluos Spa Composizioni lubrificanti aventi migliorate proprieta'di filmatura
JP2500934B2 (ja) * 1985-03-27 1996-05-29 ティーディーケイ株式会社 磁気記録媒体
JPS62246137A (ja) * 1986-04-18 1987-10-27 Mitsubishi Electric Corp 磁気記録媒体
JPH07114016B2 (ja) * 1986-06-12 1995-12-06 株式会社東芝 磁気記録媒体及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9006575A1 *

Also Published As

Publication number Publication date
WO1990006575A1 (fr) 1990-06-14

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