Abstract: Provided are a magnetic disk comprising a granular magnetic recording layer which causes less noise even with a recording capacity thereof of 250 G or more bits per square inch; and a method for manufacturing the same. The magnetic disk according to the present invention comprises: a granular magnetic recording layer (20) which is formed on a disk substrate 10 directly or via an intermediate layer and which has non-magnetic regions between granular columnar particles; and an auxiliary recording layer (22) which is formed on the granular magnetic recording layer 20 and which causes exchange interaction among the granular columnar particles, wherein the auxiliary recording layer (22) contains 0.1 to 3 moles of oxygen.

Abstract: A magnetic thin film deposition having PMA (perpendicular magnetic anisotropy) is a multilayered fabrication of materials having differing crystal symmetries that smoothly transition by use of a seed layer that promotes symmetry matching. An interface between layers in the deposition, such as an interface between a layer of MgO and an Fe-containing ferromagnetic layer, is a source of perpendicular magnetic anisotropy which then propagates throughout the remainder of the deposition by means of the symmetry matching seed layer.

Abstract: Provided herein is an apparatus, including a plurality of spaced apart perpendicular magnetic elements. Each of the magnetic elements includes a respective discrete magnetic domain and each of the magnetic elements includes a magnetic recording layer comprising a Co1-x-yPtxCry alloy material, where 0.05?x?0.35 and 0?y?0.15.

Abstract: A magnetic stack includes a substrate, a magnetic recording layer, and a TiN—X layer disposed between the substrate and the magnetic recording layer. In the TiN—X layer, X is a dopant comprising at least one of MgO, TiO, TiO2, ZrN, ZrO, ZrO2, HfN, HfO, AlN, and Al2O3.

Abstract: The invention relates to the fields of physics and materials science, more particularly to a magneto-electronic component that can he used as a digital memory, for example. The aim of the invention is to design a magneto-electronic component which can be used as a racetrack memory. Said aim is achieved by a magneto-electronic component consisting of an insulating thin film, on which an elongate element made of a magnetic material and electrically conductive contacts are located, and another insulating thin film, said arrangement being jointly rolled up. Said aim is also achieved by a method in which at least one elongate element made of a magnetic material is applied to an insulating thin film, electrical contacts are also applied, and another insulating thin film is applied thereto, the stack of layers being arranged so as to have a strain gradient.

Abstract: Magnetic structures, methods of forming the same, and memory devices including a magnetic structure, include a magnetic layer, and a stress-inducing layer on a first surface of the magnetic layer, a non-magnetic layer on a second surface of the magnetic layer. The stress-inducing layer is configured to induce a compressive stress in the magnetic layer. The magnetic layer has a lattice structure compressively strained due to the stress-inducing layer.

Abstract: The present invention is related to a target, which is a magnesium monoxide-based (MgO-based) composite having cubic crystal structure of MgO, wherein the MgO-based composite includes MgO and one or more oxides. Using MgO-based composite to form an underlayer material can improve the bonding strength among particles in the target, and then effectively reduce the falling of particles from the targets during sputtering. In addition, the MgO-based composite still maintains the cubic crystal structure of MgO, which is beneficial to make a MgO-based composites as an underlayer material in a magnetic recording medium. The invention is also related to an underlayer material for cobalt-based (Co-based) or iron-based (Fe-based) magnetic recording media. The invention is further related to a magnetic recording medium.

Abstract: Magnetic layers are described that include the use of magnetic grains and non-magnetic grain boundaries with hybrid additives. Hybrid additives include the use of at least two different additives in the composition of the grain boundaries of a magnetic layer in magnetic recording media. The use of hybrid additives in the grain boundaries results in improved recording media. Methods for forming magnetic layers and magnetic recording media with the hybrid additive grain boundaries are also described.

Abstract: [Summary] [Problem] An object is to attain both reduction in size of magnetic particles and reduction in distance between magnetic particles to achieve a higher recording density and a higher SN ratio. [Solution] A perpendicular magnetic recording medium according to the present invention is a perpendicular magnetic recording medium having a laminate film including at least a magnetic layer on a base plate, wherein the magnetic layer includes a magnetic material having a granular structure and a non-magnetic grain boundary including an inter-ceramic compound containing Mg.

Abstract: In one embodiment, a perpendicular magnetic recording medium includes a substrate, a soft-magnetic underlayer above the substrate, a seed layer above the soft-magnetic underlayer, a first intermediate layer above the seed layer, a second intermediate layer above the first intermediate layer, a recording layer above the second intermediate layer, and a protective layer above the recording layer. The second intermediate layer includes an Ru alloy having an element selected from a group consisting of: Ti in a range from about 20 at. % to about 50 at. %, Nb in a range from about 20 at. % to about 50 at. %, Al in a range from about 20 at. % to about 40 at. %, Ta in a range from about 30 at. % to about 50 at. %, and Si in a range about 20 at. % to about 40 at. %. Other magnetic media and systems using this media are described according to more embodiments.

Abstract: A perpendicular magnetic recording medium is disclosed in which a soft magnetic layer used as a low Ku layer can be stably produced with high performance. Thermal stabilization of magnetization, ease of writing by a magnetic head, and SNR also are improved. A method of manufacturing the medium is disclosed. The perpendicular magnetic recording medium includes at least a nonmagnetic underlayer, a magnetic recording layer, and a protective layer formed in this order on a nonmagnetic substrate. The magnetic recording layer includes a low Ku layer having a relatively small perpendicular magnetic anisotropy constant (Ku value), and a high Ku layer in which the Ku value is relatively large, and the low Ku layer includes a soft magnetic thin film including an iron group element-based microcrystal structure, in which a nitrogen element is added to a ferromagnetic material mainly containing one of metals of Co, Ni and Fe or an alloy of the metal.

Abstract: A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spike noise and medium noise can be positively suppressed when information recording and reproduction are carried out at high recording surface density. At least one pair of soft magnetic layers are laid and formed via a non-magnetic layer on a substrate of a non-magnetic material so that magnetic characteristics obtained by integrating the pair of soft magnetic layers have a magnetic hysteresis to thereby prevent the formation of a magnetic domain wall.

Abstract: The present invention relates to information storage media, and more particularly, to ultra-high density magnetic information storage media which comprises a plurality of discrete islands of magnetic material.

Abstract: A material comprising cobalt (Co), platinum (Pt) and phosphorus (P) having a composition of 94-98 wt % Co, 0-1 wt % Pt and 2-4 wt % P. The material may be subjected to annealing at a temperature between 100 and 500 degrees Celsius. The material is formed by electroplating a substrate in a suitable electrochemical bath. The electroplated CoPtP material forms a layer on the substrate. The CoPtP material has enhanced perpendicular magnetic properties and may be advantageous for use in microelectromechanical system (MEMS) devices.

Abstract: There are provided a method for manufacturing a magnetic recording medium which is excellent in terms of both the recording and reproduction characteristics and the thermal fluctuation characteristics without reducing the density and hardness of the perpendicular magnetic layer; a magnetic recording medium; and a magnetic recording and reproducing apparatus with which an excellent recording density is achieved, wherein, in the method for manufacturing the magnetic recording medium, at least a portion of the perpendicular magnetic layer 4 is formed as a magnetic layer having a granular structure that contains Co as a major component and also contains an oxide of at least one nonmagnetic metal selected from the group consisting of Cr, Si, Ta, Al, Ti, W and Mg; a target for forming the perpendicular magnetic layer 4 by the sputtering process is prepared so as to include an oxide of Co and a compound of Co and at least one nonmagnetic metal selected from the group consisting of Cr, Si, Ta, Al, Ti, W and Mg, and t

Abstract: A disk drive system having a shielded pole write head and media that includes a disk having a soft underlayer (SUL) that is relatively thin in order to save on cost for producing the SUL. The SUL is thin enough that it will become magnetically saturated in the vicinity of the write pole. The thickness of the SUL that will achieve this saturation may be stated as being less than a geometric factor times the ratio of the write pole saturation magnetization divided by the saturation magnetization of the SUL. The geometric factor is the ratio of the write pole area at the ABS to the write pole perimeter at the ABS.

Abstract: The invention relates to a granular perpendicular magnetic recording medium comprising a top magnetic layer on a granular layer wherein the magnetic layer comprises a continuous Co alloy film that results in the recording medium having less than 10% CoOx on the surface of the protective overcoat when the recording medium is exposed to 80% relative humidity at 80° C. for 4 days.

Abstract: A magnetic recording medium includes a nonmagnetic granular layer that has a granular structure in which a plurality of nonmagnetic grains made of a nonmagnetic material are separated from one another by a Cr oxide. The magnetic recording medium further includes a magnetic granular layer that is formed on the nonmagnetic granular layer and has a granular structure in which a plurality of magnetic grains made of a magnetic material are separated from one another by a nonmagnetic material.

Abstract: A disk substrate for a perpendicular magnetic recording medium is, disclosed. The substrate exhibits sufficient productivity, serves the function of a soft magnetic backing layer of the perpendicular magnetic recording medium, and scarcely generates noise. A perpendicular magnetic recording medium using such a substrate also is disclosed. The disk substrate comprises at least a soft magnetic underlayer formed on a nonmagnetic base plate by means of an electroless plating method. The thermal expansion coefficient of the soft magnetic underlayer is larger than a thermal expansion coefficient of the nonmagnetic disk-shaped base plate. A saturation magnetostriction constant ?s satisfies a relation ?s??1×10?5.

Abstract: A method for producing a magnetic recording medium in which the noise of the magnetic recording medium is reduced and the thermal stability of the recorded magnetization is improved, while enabling easy writing to be carried out by a recording head, is disclosed. The magnetic recording medium of the present invention includes an underlayer having an hcp crystal structure and a magnetic layer produced by a multilayer lamination of Co/Pt or the like. The deposition rate of the underlayer is equal to or lower than 0.7 nm/second. The magnetic layer contains added silicon oxide at 1 to 10 mol %. The present method includes a step for subjecting the surface of the underlayer to Ar gas mixed with oxygen of a mass/flow rate ratio of 1% to 10% under a gas pressure of 0.1 to 10 Pa for 1 to 10 second(s). The magnetic recording medium may include an orientation control layer and a soft magnetic backing layer. Ku, Ku1, and Ku2 are controlled to provide both of thermal stability and easy writing.

Abstract: A thin film structure having a magnetic layer and a seed layer positioned adjacent to the magnetic layer is provided. The seed layer includes a L10 structure.

Abstract: There is provided a perpendicular magnetic recording medium which causes low media noise and achieves preferable read/write performance. A perpendicular magnetic layer is constructed such that first magnetic layers formed of Co or Co containing an oxide and second magnetic layers formed of Pt or Pd containing an oxide are layered. The perpendicular magnetic layer is provided on a non-magnetic substrate via a Ru underlayer containing oxygen. An alignment control layer formed of a Ni—Fe alloy is provided between the non-magnetic substrate and the underlayer to control the crystal alignment of the underlayer. A soft magnetic backing layer is provided between the substrate and the alignment control layer.

Abstract: A perpendicular magnetic recording disk has a granular Co-based ferromagnetic alloy recording layer (RL) with oxides of a selected metal (Ta or Nb) and a reduced-thickness exchange-break layer (EBL) between the RL and the soft magnetic underlayer (SUL). A perpendicular magnetic recording system that includes the disk, the write head and the read head, has an improved ability to write to the RL because of the reduced-thickness EBL.

Abstract: A magnetic material comprises 50-80 wt % of Cobalt, 9-15 wt% of Nickel, 10-25 wt% of Rhenium, 0.1 to 2.0 wt% of Phosphorus, and 5-10 wt % of Tungsten or Platinum. It can be formed as a layer having good vertical magnetic properties (e.g. when magnetised it can provide a high magnetic field strength in the direction perpendicular to the plane of the layer). The layer preferably has a thickness of above 1 ?m. It can be formed by electroplating. The layer is useful for inclusion in a MEMS device.

Abstract: A perpendicular magnetic recording medium is disclosed in which a soft magnetic layer used as a low Ku layer can be stably produced with high performance. Thermal stabilization of magnetization, ease of writing by a magnetic head, and SNR also are improved. A method of manufacturing the medium is disclosed. The perpendicular magnetic recording medium includes at least a nonmagnetic underlayer, a magnetic recording layer, and a protective layer formed in this order on a nonmagnetic substrate. The magnetic recording layer includes a low Ku layer having a relatively small perpendicular magnetic anisotropy constant (Ku value), and a high Ku layer in which the Ku value is relatively large, and the low Ku layer includes a soft magnetic thin film including an iron group element-based microcrystal structure, in which a nitrogen element is added to a ferromagnetic material mainly containing one of metals of Co, Ni and Fe or an alloy of the metal.

Abstract: A magnetic recording medium is provided with a substrate, a recording magnetic layer made of a CoCr alloy and having a (11 20) crystallographic texture, and an underlayer, made of an AlV or AlRuV alloy, disposed between the substrate and the magnetic layer.

Abstract: Carbon or boron is added into the CoCr layers of a multiplayer perpendicular magnetic media structure to reduce media noise. The perpendicular magnetic media structure has sharp interfaces between Co-alloy layers and Pd or Pt layers and significantly reduced exchange coupling. In accordance with one embodiment of the invention, the perpendicular magnetic media structure with carbon or boron additives is 700 ? FeCo30.8B12/20 ? TaOx/700 ? FeCo30.8B12/20 ? TaOx/700 ? FeCo30.8B12/20 ? TaOx/158 ? FeCo30.8B12/17 ? Ta/49 ? ITO/33 ? CoCr37Ru10/2.5 ? COy/2.5 ? C/[(CoCr9)C6.8/Pd]19/50 ? CHN. [(CoCr9)C6.8/Pd]19 means 19 layers of the bi-layer stack (CoCr9)C6.8/Pd. TaOx stands for surface-oxidized Ta and COy stands for C oxides. ITO stands for Indium Tin Oxide and consists of In2O3 and Sn2O5 at 80 and 20 molecular percent respectively. CHN refers to hydrogenated and nitrogenated carbon.

Abstract: A magnetic recording medium deposited on glass and having an orientation ratio greater than one is disclosed. The magnetic recording medium includes a CoW seedlayer deposited on a circumferentially textured glass substrate. The magnetic recording medium with such a seedlayer can have an OR that is similar or higher than that with a NiP seedlayer. Magnetic recording medium with a CoW seedlayer can produce oriented glass media with orientation ratio OR>1 when sputtered on substrates which have been circumferentially textured before the deposition of the CoW seedlayer. The W content of the CoW seedlayer can range between 30-50 at %. The thickness of the CoW seedlayer can range between 10 ? and 200 ?. The method for sputter depositing the magnetic recording medium is also disclosed and includes sputter depositing the CoW seedlayer using pure Ar as sputtering gas or using a mixture of Ar and O2, H2O and N2 as sputtering gas.

Abstract: It is a magnetic recording medium for which favorable values for all of reproduced output, noise level and error rate can be obtained, and which is also superior in terms of storage stability. A magnetic recording medium (10), which has a configuration in which a magnetic layer (3) comprised of a maghemite thin film containing cobalt is formed on a tape-shaped substrate (1) comprised of aromatic polyimide, and in which the substrate (1) is 3 to 10 ?m in thickness, and 5 to 30 nm in its ten-point average roughness (SRz) of the surface on which the magnetic layer (3) is formed, and the magnetic layer (3) is 10 to 50 nm in thickness, 0.1 to 3.0 nm in center plane average thickness (SRa), and 2,000 to 4,000 Oe (158,000 to 316,000 A/m) in in-plane coercivity, is made.

Abstract: A magnetic recording medium having high C/N ratio characteristics particularly in a short wavelength range and capable of attaining a further higher-density recording as a magnetic recording tape produced by forming a magnetic layer by a vapor deposition method and other magnetic recording media of the next generation and a method of producing the same, wherein a magnetic layer is formed by a vapor deposition method on a nonmagnetic supporting body made of a polymer substrate, which has a configuration of comprising a nonmagnetic supporting body, an under layer formed on the nonmagnetic supporting body, containing Co and O and having an atomic ratio of O/Co of 0.4 or more and a magnetic layer containing Co and O, wherein the film thickness of the under layer is made 50 nm or less and the maximum incident angle is made 70° or less in the vapor deposition method.

Abstract: A magnetic recording device including a longitudinal magnetic recording medium. The longitudinal magnetic recording medium includes a magnetically soft underlayer disposed under a longitudinal recording layer. A perpendicular write head is utilized to write data to the longitudinal magnetic recording medium wherein the longitudinal recording layer is disposed within an effective write gap formed by the perpendicular write head and the underlayer. The longitudinal component of the perpendicular write head is sufficient to switch the magnetic grains in the recording layer in the presence of the perpendicular field. The magnetic recording medium can have a high areal density and improved magnetic properties.

Abstract: A perpendicular recording medium having a magnetic layer comprising cobalt, platinum, and at least one of molybdenum and chromium. In a preferred embodiment, the perpendicular recording medium comprises granular magnetic regions having oxygen-containing grain boundaries. The magnetic layer of the present invention preferably exhibits improved corrosion resistance while maintaining the magnetic properties suitable for high density perpendicular recording.

Abstract: The present invention is directed to-carrying out a high density magnetic recording to a material having a large coercive force by perpendicular magnetic recording head. By giving a patterning onto a soft magnetic under layer of a perpendicular two-layer recording media in sync with a period of a recording bit, a magnetic field from a write head can be allowed to converge to a soft magnetic column. Therefore, a magnetization reversal of the magnetic recording media material having a large anisotropic constant becomes possible, and then a high density magnetic recording can be achieved.

Abstract: A perpendicular magnetic recording medium has high recording density and excellent read-write characteristics. The recording medium has a magnetic layer of a multilayered lamination structure composed of laminated cobalt layers mainly containing cobalt and noble metal layers of platinum or palladium. At least one of the cobalt layers and the noble metal layers contains at least one element selected from the group consisting of Ru, Ta, Nb, Mo, Mn, Cr, Si, and Ni, or an oxide, in a concentration ranging from 1 to 15 mol %. The magnetic layer is formed on an underlayer of ruthenium or the like for reducing magnetic interaction between the magnetic particles in the magnetic layer. The surface of the underlayer is treated for oxygen adsorption before depositing the magnetic layer to suppress magnetic interaction between the magnetic particles in the magnetic layer.

Abstract: A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic film in which an axis of easy magnetization is oriented mainly perpendicularly with respect to the substrate; and a protection film, wherein the perpendicular magnetic film has a structure in which a large number of magnetic grains are separated by a grain boundary layer, and an average separating distance between the magnetic grains along a straight line which connects centers of gravity of mutually neighboring magnetic grains is 1 nm or greater.

Abstract: A magnetic recording medium having a non-magnetic substrate, a non-magnetic undercoat layer, a plurality of magnetic layers, and a protective film, is disclosed. At least one non-magnetic coupling layer is provided above the non-magnetic undercoat layer, a first magnetic layer is provided beneath the non-magnetic coupling layer and a second magnetic layer is provided atop the non-magnetic coupling layer, and the first magnetic layer is formed of a CoRu-based alloy, a CoRe-based alloy, a CoIr-based alloy, or a CoOs-based alloy.