Abstract:
A system and method for improving the durability and reliability of recording media used in hard drives is disclosed. A protective overcoat made by depositing a diamond like carbon (DLC) layer over a magnetic layer and then depleting a portion of the DLC protective layer of hydrogen before it is coated with a Perfluoropolyethers (PFPE) using an in-situ vapor lubrication technique. The portion of the DLC layer which is depleted can be data zone of the media so that the lubricant-bonding ratio is higher for the landing zone than it is for the data zone.
Abstract:
A magnetic recording medium comprising a magnetic layer and a protective carbon-containing overcoat comprising a first carbon density, preferably of a low-density carbon, and a second carbon density different from the first carbon density, preferably of a high-density carbon, and a method of making and using the magnetic recording medium are disclosed.
Abstract:
A granular longitudinal or perpendicular magnetic recording medium with enhanced corrosion resistance comprises: (a) a non-magnetic substrate having a surface; (b) a layer stack on the substrate surface, including a granular longitudinal or perpendicular magnetic recording layer having a surface distal the substrate surface treated to provide at least one of: (i) a reduction of nano-scale roughness and porosity; (ii) increased compositional homogeneity; (iii) increased microstructural homogeneity; (iv) preferential removal of at least one element; and (v) increased grain boundary coverage by the subsequently deposited protective overcoat layer; and (c) a protective overcoat layer on the treated surface of the granular magnetic recording layer.
Abstract:
A magnetic recording medium comprising a magnetic layer and a protective carbon-containing overcoat comprising a first carbon density, preferably of a low-density carbon, and a second carbon density different from the first carbon density, preferably of a high-density carbon, and a method of making and using the magnetic recording medium are disclosed.
Abstract:
A granular magnetic recording medium comprises a non-magnetic substrate having a surface, a layer stack on the substrate surface, including an outermost granular magnetic recording layer, a cap layer on the granular magnetic recording layer, having a sputter-etched outer surface, and a protective overcoat layer on the sputter-etched outer surface of the cap layer.
Abstract:
A method of depositing a layer of a coating material (e.g., DLC protective overcoats of magnetic and magneto-optical recording media) on a surface of a substrate/workpiece, the layer including relatively thin and relatively thick regions defining a thickness gradient at a boundary therebetween, comprising steps of: (a) providing a filtered cathodic arc deposition (FCAD) process/treatment chamber comprising a FCAD source including means for providing a focused plasma beam containing ions of a coating material and means for scanning the plasma beam over a substrate/workpiece surface; (b) providing the process/treatment chamber with a substrate/workpiece including a surface for deposition thereon; and (c) forming on the surface a layer of coating material including the relatively thin and relatively thick regions defining the thickness gradient at the boundary therebetween by scanning the plasma beam over at least a portion of the surface.
Abstract:
A method of manufacturing magnetic recording media, comprising sequential steps of: (a) providing an apparatus for manufacturing the media; (b) supplying the apparatus with at least one substrate for the media; (c) forming a magnetic recording layer on the at least one substrate in a first portion of the apparatus, the magnetic recording layer including a surface; (d) treating the surface of the magnetic recording layer with an ionized oxygen-containing plasma in a second portion of the apparatus to form a plasma oxidized surface layer; and (e) forming a protective overcoat layer on the plasma oxidized surface layer of the magnetic recording layer in a third portion of the apparatus.
Abstract:
A recording medium, comprising: (a) a substrate having at least one surface; (b) a stacked plurality of thin film layers on the at least one surface and including at least one magnetic or magneto-optical (MO) recording layer; and (c) a protective overcoat layer on an outer surface of an outermost layer of the layer stack, comprising: (i) a first sub-layer layer (c1) of undoped tetrahedral amorphous carbon (ta-C) formed by filtered cathodic arc deposition (FCAD) on the outer surface of the outermost layer of the stacked plurality of thin film layers and having a high mass density of carbon (C) atoms greater than about 2.5 gms/cm3; and (ii) a second sub-layer (c2) of nitrogen-doped tetrahedral amorphous carbon (ta-C:N) formed by FCAD on the undoped ta-C layer and having a high mass density of carbon (C) atoms greater than about 2.0 gms/cm3.
Abstract translation:一种记录介质,包括:(a)具有至少一个表面的基底; (b)在所述至少一个表面上堆叠的多个薄膜层,并且包括至少一个磁光或磁光(MO)记录层; (c)在层叠体的最外层的外表面上的保护性外涂层,包括:(i)未掺杂的四面体无定形碳(ta)的第一子层层(c 1) -C)通过过滤的阴极电弧沉积(FCAD)形成在层叠的多个薄膜层的最外层的外表面上,并且具有大于约2.5gms / cm 2的碳(C)原子的高质量密度, 3 SUP>; 和(ii)由FCAD在未掺杂的Ta-C层上形成并且具有高质量密度的由氮化物掺杂的四面体无定形碳(ta-C:N)的第二子层(c 2 N 2) 的碳(C)原子大于约2.0gms / cm 3。
Abstract:
A magnetic recording medium with a dual-layer lubricant for better and faster mobility of a lubricant to ensure rapid healing of areas of the medium that have been depleted of the lubricant is disclosed.
Abstract:
A magnetic recording medium having a substrate, a granular magnetic layer and a magnetic cap layer covered with carbon overcoat, in this order, wherein both the granular magnetic and magnetic cap layers contain magnetic grains and non-magnetic grain boundaries, and further wherein the magnetic cap layer has denser grain boundaries and the magnetic cap layer contains substantially no oxide is disclosed. The magnetic cap layer serves as both magnetic layer and corrosion barrier for lower HMS.