Abstract: Glass-based articles comprise stress profiles providing improved scratch resistance. The glass-based articles comprise: a thickness t; a lithium aluminosilicate composition; and a molar ratio of sodium oxide (Na2O) to lithium oxide (Li2O) that is less than or equal to 0.63 at the center of the glass-based article. The articles have a molar ratio of sodium dioxide (Na2O) to lithium dioxide (Li2O) in a post-spike near region that is greater than or equal to 0.9 and/or less than 1.5.

Abstract: A compound represented by the following formula (1): wherein R1 is a monovalent organic group containing a polyether chain; X1 and X2 are each individually a monovalent group; and the polyether chain is a chain represented by the following formula: —(OC6F12)m11—(OC5F10)m12—(OC4F8)m13—(OC3X106)m14—(OC2F4)m15—(OCF2)m16—, wherein m11, m12, m13, m14, m15, and m16 are each individually an integer of 0 or 1 or greater; X10s are each individually H, F, or Cl; the repeating units are present in any order; and the sum of m11 to m16 is an integer of 10 or greater, R1 being other than those containing a urethane bond.

Abstract: A magnetic recording medium, which is used in a recording and playback device in which the shortest recording wavelength is 75 nm or less, in which the magnetic recording medium has a recording layer including powder of ?-iron oxide-containing particles, the average particle size of the particles is 22 nm or less, the coercive force He is 220 kA/m or more and 320 kA/m or less, and the non linear transition shift is 20% or less.

Abstract: A magnetic domain wall movement type magnetic recording element includes: a first ferromagnetic layer which includes a ferromagnetic body; a non-magnetic layer which faces the first ferromagnetic layer; and a magnetic recording layer which faces a surface of the non-magnetic layer on a side opposite to the first ferromagnetic layer and extends in a first direction. The magnetic recording layer has a concave-convex structure on a second surface opposite to a first surface which faces the non-magnetic layer.

Abstract: Letting a particle diameter be Dx (?m) when a cumulative particle volume cumulated from the small particle diameter side reaches x (%) of the total particle volume in a particle size distribution obtained regarding cerium oxide included in a polishing liquid using a laser diffraction/scattering method, D5 is 1 ?m or less, and a difference between D95 and D5 is 3 ?m or more.

Abstract: The present invention aims at providing a magnetic recording medium that can lower a Curie temperature (Tc) of a magnetic material, without increasing an in-plane coercive force and lowering magnetic properties. The magnetic recording medium is a magnetic recording medium comprising a substrate and a magnetic recording layer, the magnetic recording layer comprising an FePtRh ordered alloy, wherein a Rh content in the FePtRh ordered alloy is 10 at % or less.

Abstract: The magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer, the magnetic recording layer consists of a first magnetic recording layer or a plurality of layers including at least the first magnetic recording layer and a second magnetic recording layer, the first magnetic recording layer has a granular structure including a first magnetic crystal grain and a first nonmagnetic crystal grain boundary, the first magnetic crystal grain consists of an ordered alloy having Fe, Pt and Rh, the first nonmagnetic crystal grain boundary consists of carbon, boron or a combination thereof, the second magnetic recording layer has a granular structure including a second magnetic crystal grain and a second nonmagnetic crystal grain boundary, the second magnetic crystal grain consists of an FePt ordered alloy or an ordered alloy having Fe, Pt and Rh, and the second nonmagnetic crystal grain boundary includes carbon.

Abstract: The present disclosure provides systems and methods associated with data storage using atomic films, such as graphene, boron nitride, or silicene. A platter assembly may include at least one platter that has one or more substantially planar surfaces. One or more layers of a monolayer atomic film, such as graphene, may be positioned on a planar surface. Data may be stored on the atomic film using one or more vacancies, dopants, defects, and/or functionalized groups (presence or lack thereof) to represent one of a plurality of states in a multi-state data representation model, such as a binary, a ternary, or another base N data storage model. A read module may detect the vacancies, dopants, and/or functionalized groups (or a topographical feature resulting therefrom) to read the data stored on the atomic film.

Abstract: A magnetic tape which comprises a nonmagnetic support, a magnetic layer which is formed on one surface of the nonmagnetic support, and a backcoat layer which comprises a binder and nonmagnetic powder containing carbon black as a component and which is formed on the other surface of the nonmagnetic support, having pits for optical servo formed thereon, characterized in that the average of the reflectance on the flat portion of the backcoat layer is 8.5% or higher, and that the maximum rate of fluctuation of the reflectance on the flat portion, depending on a position of the magnetic tape: [Maximum of absolute value of (Reflectance?Average reflectance)]×100/(Average reflectance) is 10% or lower. This magnetic tape is high in the initial S/N of the servo signal, and also high in the S/N of the servo signal found after the magnetic tape is run twice.

Abstract: Aspects of the present invention are directed to heat assisted magnetic recording (HAMR) media with a CoCrPtB based capping layer design that is capable of reducing switching field distribution and boosting signal-to-noise ratio of HAMR media. In one embodiment of the invention, a recording medium for heat assisted magnetic recording (HAMR) includes a substrate, a magnetic recording layer on the substrate, and a capping layer on and directly in contact with the magnetic recording layer. The capping layer includes CoCrPtB.

Abstract: A magnetic recording medium in which information can be recorded using a heat-assisted magnetic recording method comprises a recording layer formed on a substrate. The recording layer has a plurality of magnetic recording bit regions and a plurality of high thermal conductors each extending inside a corresponding one of the bit regions. The high thermal conductors have a thermal conductivity higher than that of the recording layer and assist in dissipating heat energy imparted to the bit regions during the recording of information.

Abstract: A method for etching a media is disclosed. A first magnetic layer comprising grains is deposited with a segregant such that a portion of the first segregant covers a top surface of the grains of the first magnetic layer and a second portion of the first segregant separates the grains of the first magnetic layer. The first segregant is etched to remove the portion of the first segregant that covers the top surface of the grains.

Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which includes essential components in the form of SiO2, Li2O, Na2O, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO, wherein a molar ratio of a content of MgO to a combined content of MgO, CaO, SrO, and BaO (MgO/(MgO+CaO+SrO+BaO)) is equal to or greater than 0.80, and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C.

Abstract: Systems and methods for providing thermal barrier bilayers for heat assisted magnetic recording (HAMR) media are provided. One such HAMR medium includes a substrate, a heat sink layer on the substrate, a thermal barrier bilayer on the heat sink layer, the bilayer comprising a first thermal barrier layer on the heat sink layer and an amorphous underlayer on the first thermal barrier layer, and a magnetic recording layer on the amorphous underlayer, wherein a thermal conductivity of the first thermal barrier layer is less than a thermal conductivity of the amorphous underlayer.

Abstract: Provided are a magnetic disk substrate and a method of manufacturing the same, wherein the magnetic disk substrate has very few defects present on its surface with an arithmetic mean roughness (Ra) at a level in the vicinity of 0.1 nm and thus is suitable as a substrate for a magnetic disk with high recording density. The magnetic disk glass substrate is such that the arithmetic mean roughness (Ra) of the main surface of the glass substrate measured using an atomic force microscope with a resolution of 256×256 pixels in a 2 ?m×2 ?m square is 0.12 nm or less and the number of defects detected to have a size of 0.1 ?m to 0.6 ?m in plan view and a depth of 0.5 nm to 2 nm is less than 10 per 24 cm2, wherein the defects are each detected using a shift in wavelength between incident light and reflected light upon irradiating and scanning helium neon laser light with a wavelength of 632 nm on the main surface of the glass substrate.

Abstract: A perpendicular magnetic recording disk has servo regions that have a patterned underlayer with seed layer pillars formed on the underlayer pillars above the underlayer trenches. The underlayer is made of an oxidizable material. Magnetic recording material is located on the seed layer pillars and on an oxide layer in the underlayer trenches. The magnetic material in the trenches exhibits a magnetic field substantially less than the magnetic field exhibited by the magnetic material on the seed layer pillars, which has perpendicular magnetic anisotropy. The reduced magnetic field from the trenches results from structural differences between the magnetic material on the seed layer pillars and in the trenches, such as smaller grain size of the magnetic material on the seed layer pillars and a wider distribution of crystallographic axes of the magnetic material in the trenches. The seed layer may be made of a material substantially non-reactive with oxygen.

Abstract: According to one embodiment, there is provided a magnetic recording medium manufacturing method including forming a resist layer on a magnetic recording layer, patterning the resist layer, forming a magnetic pattern by performing ion implantation through the resist layer, partially modifying the surface of the magnetic recording layer, removing the resist, applying a self-organization material to the surface of the magnetic recording layer and forming a dotted mask pattern, and patterning the magnetic recording layer.

Abstract: Systems and methods for providing heat assisted magnetic recording (HAMR) media configured to couple energy from a near field transducer (NFT) are provided. One such method includes providing a magnetic recording layer including an L10 ordered FePt or an L10 ordered CoPt, selecting a plurality of preselected parameters for a coupling layer, the preselected parameters including a material, a preselected deposition temperature, and a preselected thickness, and depositing the coupling layer directly on the magnetic recording layer using the preselected parameters such that the coupling layer has an extinction coefficient greater than 0.1.

Abstract: An apparatus and associated method are generally described as a thin film exhibiting a tuned anisotropy and magnetic moment. Various embodiments may form a magnetic layer that is tuned to a predetermined anisotropy and magnetic moment through deposition of a material on a substrate cooled to a predetermined substrate temperature.

Abstract: A method and apparatus for forming magnetic media substrates is provided. A patterned resist layer is formed on a substrate having a magnetically susceptible layer. A conformal protective layer is formed over the patterned resist layer to prevent degradation of the pattern during subsequent processing. The substrate is subjected to an energy treatment wherein energetic species penetrate portions of the patterned resist and conformal protective layer according to the pattern formed in the patterned resist, impacting the magnetically susceptible layer and modifying a magnetic property thereof. The patterned resist and conformal protective layers are then removed, leaving a magnetic substrate having a pattern of magnetic properties with a topography that is substantially unchanged.

Abstract: According to one embodiment, a magnetic recording medium manufacturing method includes a step of coating the mask layer with a metal fine particle coating solution containing metal fine particles and a first solvent, thereby forming a metal fine particle coating layer having a multilayered structure of the metal fine particles, and a step of dropping, on the coating layer, a second solvent having a second solubility parameter having a difference of 0 to 12.0 from a first solubility parameter of the first solvent, thereby forming a monolayered metal fine particle film by washing away excessive metal fine particles and changing the multilayered structure of the metal fine particles into a monolayer. The projections pattern is made of the monolayered metal fine particle film.

Abstract: A magnetic recording medium includes a magnetic recording layer. The magnetic recording layer includes a first magnetic layer formed as a pattern portion that is a data portion in a servo region, a second magnetic layer formed as a non-pattern portion that is magnetized to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer, and a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer.

Abstract: A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 ?m is extracted from surface shapes in each of the regions and, assuming that a root mean square roughness Rq of the surface shape is given as a microwaviness Rq, the difference between the microwavinesses Rq of the regions is 0.02 nm or less or the difference between standard deviations of the microwavinesses Rq of the regions is 0.04 nm or less.

Abstract: A magnetic recording medium includes a recording layer having a granular structure in which magnetic particles are dispersed within a non-magnetic base, and a non-magnetic material embedded in grooves of patterns formed on the recording layer. The magnetic particles have an inverted truncated cone shape with a diameter larger in an upper region of the recording layer than in a lower region of the recording layer.

Abstract: In one embodiment, there are provided: a substrate; a data area disposed on the substrate and having a plurality of first magnetic dots arrayed in lines in mutually different first, second, and third directions; and a boundary magnetic part having a plurality of first magnetic portions arrayed in a line in the third direction and each having a length longer than that of the first magnetic dot in the third direction, and a second magnetic dot disposed between the first magnetic portions and disposed on extensions in the first and second directions of the first magnetic dots, and disposed along with the data area on the substrate.

Abstract: Approaches to reduce switching field distribution in energy assisted magnetic storage devices involve first and second exchange coupled magnetic elements. The first magnetic elements have anisotropy, Hk1, volume, V1 and the second magnetic elements are magnetically exchange coupled to the first magnetic elements and have anisotropy Hk2, and volume V2. The thermal stability of the exchange coupled magnetic elements is greater than about 60 kBT at a storage temperature of about 300 K. The magnetic switching field distribution, SFD, of the exchange coupled magnetic elements is less than about 200% at a predetermined magnetic switching field and a predetermined assisting switching energy.

Abstract: An apparatus and associated method may provide a magnetic element can have a thin film deposited on a cryogenic substrate. The thin film can additionally be stress tuned ,during primary annealing to reduce unwanted stress anisotropy. The thin film can be configured to have near zero internal stress after the primary annealing.

Abstract: Approaches to reduce switching field distribution in energy assisted magnetic storage devices involve first and second exchange coupled magnetic elements. The first magnetic elements have anisotropy, Hk1, volume, V1 and the second magnetic elements are magnetically exchange coupled to the first magnetic elements and have anisotropy Hk2, and volume V2. The thermal stability of the exchange coupled magnetic elements is greater than about 60 kBT at a storage temperature of about 300 K. The magnetic switching field distribution, SFD, of the exchange coupled magnetic elements is less than about 200% at a predetermined magnetic switching field and a predetermined assisting switching energy.

Abstract: A magnetic media has a substrate with an underlayer and a seed layer on the underlayer. The seed layer has a non-continuous metallic layer with a cubed crystalline lattice that is 001 textured, and has a lattice mismatch within 15% of a crystalline lattice structure of FePt with a metallic additive. This structure defines nucleation sites with an established epitaxial interface.

Abstract: A perpendicular magnetic recording medium comprises a non-magnetic substrate having a surface; and a plurality of overlying thin film layers forming a layer stack on the substrate surface, the layer stack including a magnetically hard perpendicular magnetic recording layer structure and an underlying soft magnetic underlayer (SUL), the SUL having a thickness of up to about 100 ?. Also disclosed is a data/information recording, storage, and retrieval system comprising the perpendicular magnetic recording medium and a single-pole magnetic transducer head including main and auxiliary poles positioned in spaced adjacency to an upper surface of the layer stack, the single-pole transducer head comprising a front shield adjacent the main pole.

Abstract: An apparatus having a recording layer of a magnetic material with a concentration of implanted ions that increases in relation to a thickness direction of the recording layer to provide the recording layer with a continuously varied perpendicular magnetic anisotropy constant.

Abstract: A data storage medium includes a carrier substrate having an electrode layer on the surface thereof and a sensitive material layer extending along the electrode layeradapted to be locally modified between two electrical states by the action of a localized electric field. A reference plane extends globally parallel to the sensitive material layer and is configured to accommodate at least one element for application of an electrostatic field in combination with the electrode layer the electrode layer including a plurality of conductive portions having a dimension at most equal to 100 nm in at least one direction parallel to the reference plane and separated by at least one electrically insulative zone, where at least some of the conductive portions are electrically interconnected, the conductive portions defining data write/read locations within the sensitive material layer.

Abstract: The invention relates to bit patterned recording media having a stop layer for chemical mechanical polishing. One embodiment of the present invention is a method of manufacturing a magnetic recording medium comprising the step of planarizing by chemical mechanical polishing until the stop layer is reached. The present invention also provides a magnetic recording medium having a stop layer.

Abstract: A method for manufacturing a bit patterned magnetic media for magnetic data recording. The method includes selectively depositing a self assembled monolayer over a seed layer and then oxidizing the deposited self assembled monolayer. The self-assembled monolayer can be deposited by use of a stamp to form a pattern covering areas where a non-magnetic segregant (such as an oxide) is to be formed and openings where a magnetic material is to be formed. A magnetic alloy and a segregant (such as an oxide) are then co-sputtered. The magnetic alloy grows only or selectively over the seed layer, whereas the segregant grows only or selectively over the oxidized self-assembled monolayer.

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: A magnetic recording medium 1 includes a substrate 11; and a metallic glassy layer 12 that is arranged on the substrate 11 and has a plurality of convex portions 12A and concave portions 12B. The metallic glassy layer 12 has a chemical composition represented by any one of the formulae (1) to (3): FemPtnSixByPz (wherein, 20<m?60 at %, 20<n?55 at %, 11?x<19 at %, 0?y<8 at %, and 0<z<8 at %) (1); Fe55Pt25(SixByPz)20 (wherein, 11?x<19 at %, 0?y<8 at %, and 0<z<8 at %) (2); and (Fe0.55Pt0.25Si0.16B0.02P0.02)100-xMx (wherein 0<X?6 at %; and M represents an element or a combination of an two or more of the elements selected from Zr, Nb, Ta, Hf, Ti, Mo, W, V, Cr, Mn, Al, Y, Ag, and rare earth elements.) (3).

Abstract: A magnetic recording medium a magnetic recording medium includes a soft magnetic layer formed on a substrate, magnetic patterns made of a protruded ferromagnetic layer separated from each other on the soft magnetic layer, and a nonmagnetic layer formed between the magnetic patterns, a nitrogen concentration therein being higher on a surface side than on a substrate side.

Abstract: A discrete track medium and a patterned medium that are excellent in both magnetic recording properties and corrosion resistance are realized. The medium has a magnetic recording layer, which includes a magnetic region formed in a projection portion of a projection/recess pattern over a substrate and a filler region embedded in a recess portion of the projection/recess pattern, and an organic compound, which exhibits corrosion inhibition action for cobalt or cobalt alloys, between the magnetic region and the filler region.

Abstract: According to one embodiment, a magnetic recording medium includes a substrate, and a magnetic recording layer formed on the substrate and having patterns of protrusions and recesses corresponding to a servo area and a recording area, in which the magnetic recording layer located in each of the recesses in the recording area has a thickness smaller than two thirds of a thickness of the magnetic recording layer corresponding to each of the protrusions, the magnetic recording layer remaining in each of the recesses in the recording area has a thickness of 1 nm or more, and a difference in height on a surface of the magnetic recording medium is 7 nm or less.

Abstract: A magnetic recording medium includes a disk substrate, and recording cells arrayed on the disk substrate in a track direction, the recording cells includes a ferromagnetic pattern and a magnetic pattern formed on one of two sidewalls of the ferromagnetic pattern in the track direction and having a lower crystalline magnetic anisotropy constant Ku than that of the ferromagnetic pattern.

Abstract: A magnetic recording medium is provided in which recording elements and concave portions have a clear difference in terms of magnetism at the boundaries therebetween, and which has favorable production efficiency. The magnetic recording medium includes a substrate; a recording layer formed in a predetermined concavo-convex pattern over the substrate, convex portions of the concavo-convex pattern serving as recording elements; and a filler portion filling a concave portion between the recording elements. A center part of a bottom surface of the concave portion protrudes from edge parts of the bottom surface of the concave portion in a direction away from the substrate.

Abstract: There are provided magnetic storage elements capable of performing a high-reliability write operation by inhibiting erroneous reversal of data of the magnetic storage element put in a semi-selected state, and a magnetic storage device using this. A recording layer having an easy axis and a hard axis overlaps at least one of a first or second conductive layer at the entire region thereof in plan view. First endpoints of a first line segment along the easy axis and maximum in dimension overlapping the recording layer in plan view don't overlap the second conductive layer in plan view. At least one of second endpoints of a pair of endpoints of a second line segment passing through the middle point of the first line segment, orthogonal to the first line segment in plan view, and overlapping the recording layer in plan view doesn't overlap the first conductive layer in plan view.

Abstract: Approaches to reduce switching field distribution in energy assisted magnetic storage devices involve first and second exchange coupled magnetic elements. The first magnetic elements have anisotropy, Hk1, volume, V1 and the second magnetic elements are magnetically exchange coupled to the first magnetic elements and have anisotropy Hk2, and volume V2. The thermal stability of the exchange coupled magnetic elements is greater than about 60 kBT at a storage temperature of about 300 K. The magnetic switching field distribution, SFD, of the exchange coupled magnetic elements is less than about 200% at a predetermined magnetic switching field and a predetermined assisting switching energy.

Abstract: Disclosed is a lubricant composition comprising at least one kind of compound represented by following formula (1): where X represents a cyclic group that may be substituted; Y represents a divalent or higher-valent linking group having at least one polar group and having no aromatic cyclic group; p1 represents an integer of 1 to 4; p2, p3, and p4 each represent an integer of 0 to 4; q represents an integer of 0 to 30; n represents an integer of 1 to 10; s represents an integer of 1 to 4; and t represents an integer of 2 to 10.

Abstract: A discrete track perpendicular magnetic recording (PMR) disk and a method of fabricating the disk are described. The PMR disk may include a heat sink layer disposed above a substrate, intermediate layers disposed above the heat sink layer, and a magnetic recording layer disposed above the intermediate layers. The magnetic recording layer may have raised and recessed areas, where a heat conductive material may be disposed within one or more of the recessed areas.

Abstract: A method and apparatus for forming magnetic media substrates is provided. A patterned resist layer is formed on a substrate having a magnetically susceptible layer. A conformal protective layer is formed over the patterned resist layer to prevent degradation of the pattern during subsequent processing. The substrate is subjected to an energy treatment wherein energetic species penetrate portions of the patterned resist and conformal protective layer according to the pattern formed in the patterned resist, impacting the magnetically susceptible layer and modifying a magnetic property thereof. The patterned resist and conformal protective layers are then removed, leaving a magnetic substrate having a pattern of magnetic properties with a topography that is substantially unchanged.

Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder is comprised of magnetic particles comprising a hard magnetic particle and a soft magnetic material deposited on a surface of the hard magnetic particle in a state where the soft magnetic material is exchange-coupled with the hard magnetic particle.

Abstract: According to one embodiment, a method of manufacturing a patterned medium includes depositing a magnetic recording layer and applying an ultraviolet curable resin on both surfaces of a medium substrate, pressing a first resin stamper and a second resin stamper each including patterns of recesses and protrusions, corresponding to a patterned medium, against both surfaces of the medium substrate in such a manner that a direction from a center of the medium substrate toward a center of the first resin stamper is off-oriented from a direction from the center of the medium substrate toward a center of the second resin stamper to imprint the patterns of recesses and protrusions on the ultraviolet curable resin, and irradiating the ultraviolet curable resin with an ultraviolet ray through each of the first and second resin stampers to cure the ultraviolet curable resin.

Abstract: For the purpose of providing a glass substrate for an information recording medium capable of acquiring a low GA value, provided is the glass substrate for an information recording medium, wherein a surface of the glass substrate has an arithmetic mean undulation Wa of less than 0.6 nm, and a fine undulation having a root-mean-square height Rq of less than 0.01 nm at a measurement wavelength of 80-120 ?m in a radial direction.

Abstract: The magnetic recording medium of the present invention comprises: a non-magnetic substrate; a non-magnetic layer formed on one of principal surfaces of the non-magnetic substrate; and a magnetic layer formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate. Mr and t satisfy 0.0020 ?T·m?Mr·t?0.0150 ?T·m, where Mr is the residual magnetic flux density of the magnetic layer, and t is the average thickness of the magnetic layer, L1 satisfies 2 nm?L1?6 nm, where L1 is the average thickness of a first mixed layer that is formed on the surface of the magnetic layer opposite to the non-magnetic layer, and L2 satisfies 0.1?L2/t?0.45, where L2 is the average thickness of a second mixed layer that is formed on the surface of the magnetic layer facing the non-magnetic layer.