Abstract: A perpendicular magnetic recording media is disclosed which employs inexpensive materials in the intermediate layer of the high-recording density media while exhibiting magnetic characteristics comparable or superior to those of media using Ru or Re. A perpendicular magnetic recording apparatus employing this perpendicular magnetic recording media also is disclosed. The perpendicular magnetic recording media has a nonmagnetic substrate, a soft magnetic backing layer formed on the nonmagnetic substrate, a seed layer formed on the soft magnetic backing layer, an intermediate layer formed on the seed layer, a magnetic layer formed on the intermediate layer, and a protective layer formed on the magnetic layer. The intermediate layer comprises an alloy with the hcp structure containing 55 at % or more Zn, the magnetic layer comprises an alloy with the hcp structure containing Co, and the ??50 value of the orientation plane (0002) of the magnetic layer is between 1.5° and 4°.

Abstract: Magnetic storage media that include a multilayer structure are described. In general, the magnetic storage media include a substrate, an underlayer that includes a plurality of underlayer particles formed over the substrate, and a magnetic layer that includes a plurality of magnetic particles formed over the underlayer. The magnetic layer may define a saturated magnetization and thickness product less than or equal to approximately 1.00 memu per square centimeter, and the magnetic particles may be selected from the group consisting of magnetic platelet-shaped particles and magnetic particles with an aspect ratio less than or equal to approximately 1.5. In addition, the described magnetic storage media may exhibit minimal interlayer diffusion between the underlayer and magnetic layer. Reduced interlayer diffusion between different layers of a magnetic recording medium may result in an improved magnetic recording surface for recording and storing data.

Abstract: An apparatus includes a first seedlayer including a hexagonal close-packed alloy with a sigma phase addition, and an active layer including a plurality of quantum dots on the first seedlayer. The apparatus can further include a substrate, an adhesion layer on the substrate, and a wetting layer on the adhesion layer, wherein the first seedlayer is on the wetting layer.

Abstract: A perpendicular magnetic recording medium comprises a layer stack formed over a surface of a non-magnetic substrate, and comprising, in overlying sequence from the surface: a magnetically soft underlayer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer on the interlayer structure; wherein the interlayer structure is a triple-layer stacked structure comprising: a first interlayer of a first non-magnetic material proximal the magnetically soft underlayer and containing Ru; a second interlayer of a second non-magnetic material in overlying contact with the first interlayer and not containing Ru; and a third interlayer of a third non-magnetic material in overlying contact with the second interlayer and containing Ru.

Abstract: A biaxially oriented polyester film which has a Young's modulus (YMD) in the film machine direction (YMD) of 6.5 GPa or more and a Young's modulus in the width direction (YTD) of 8.2 to 9.8 GPa and is used as a base film for magnetic recording tapes of linear recording system, and a magnetic recording tape of linear recording system comprising the same as a base film. There are provided a biaxially oriented polyester film which has excellent dimensional stability, especially dimensional stability in the width direction and is suitable for use as a base film for magnetic recording tapes of linear recording system and a magnetic recording tape comprising the same.

Abstract: A perpendicular magnetic recording medium including: a substrate; a perpendicular magnetic recording layer disposed over the substrate; a soft magnetic underlayer disposed between the substrate and the perpendicular magnetic recording layer; a shunting layer disposed under the soft magnetic underlayer; and an isolation layer disposed between the soft magnetic underlayer and the shunting layer and providing magnetic isolation between the shunting layer and the other layers disposed over the shunting layer are provided. The shunting layer is magnetically separated from the other magnetic layers disposed over the shunting layer, and shunts a magnetic field generated by the magnetic domain walls of the soft magnetic underlayer such that the magnetic field cannot reach a magnetic head, thereby increasing a signal-to-noise ratio (SNR).

Abstract: Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having a L10 structure, characterized in that at least one of the underlayers is predominantly comprised of MgO and comprises at least one kind of a metal element having a melting point of at least 2,000° C., such as Nb, Mo, Ru, Ta or W. The thermally assisted magnetic recording medium has magnetic crystal grains having uniform size in the magnetic layer, and has a narrow switching field distribution (SFD), and a magnetic recording storage provided with the thermally assisted magnetic recording medium exhibits a high SN ratio.

Abstract: The invention provides a structured material composed by including a noble metal, in which an oriented layer is formed on a layer containing a Group 4A metal. The invention enables to form an oriented layer, which has required a high temperature for formation, by a low temperature process.

Abstract: An object is to provide a perpendicular magnetic recording medium including a ground layer that prevents corrosion, while achieving a primary object of promoting finer magnetic particles of a magnetic recording layer and isolation of these magnetic particles. The structure of a perpendicular magnetic recording medium 100 according to the present invention includes, at least on a base 110: a magnetic recording layer 122 on which a signal is recorded; a ground layer 118 provided below the magnetic recording layer; a non-magnetic layer 116 for controlling crystal orientation of the ground layer; and a soft magnetic layer 114 provided below the non-magnetic layer. The ground layer 118 is configured to have three layers including, in an order from bottom, a first ground layer 118a and a second ground layer 118b that contain ruthenium, and a third ground layer 118c that contains a metal.

Abstract: A magnetic recording medium comprises: (a) a non-magnetic substrate having a surface; and (b) a stack of thin film layers on the substrate surface, including a layer of a magnetic alloy material with a stabilized hexagonal close-packed (“hcp”) crystal structure, comprising: (i) a major amount of a ferromagnetic element with a first hcp crystal structure having a first c/a ratio, where “c” is a lattice parameter of the unique symmetry axis of the hcp structure along which a preferred direction of magnetization lies and “a” is a lattice parameter along a direction perpendicular to the c axis; (ii) a minor amount of a non-magnetic element with a face-centered cubic (fcc) crystal structure; and (iii) a minor amount of at least one hcp-stabilizing element.

Abstract: The present invention relates to a perpendicular magnetic recording medium including at least a backing layer, an orientation control layer, a magnetic recording layer and a protective layer provided on top of a non-magnetic substrate, wherein the orientation control layer is composed of two or more layers including a seed layer and an intermediate layer, formed in that order from the substrate side, and the seed layer is formed of a material containing 5 to 25 atomic % of an element for which, in a phase diagram, the solid solution region with an element having a face-centered cubic structure is not more than 1 atomic %. Also provided is a magnetic recording/reproducing device that includes the magnetic recording medium and a magnetic head for recording and reproducing information on the magnetic recording medium.

Abstract: Improvements to magnetic recording device including magnetic recording media are described. The improvements include the addition of copper to the recording layer as well as improved underlayers. In addition, improved manufacturing processes and magnetic/recording properties for media through heating and oxidation are described.

Abstract: A magnetic recording medium having excellent stability of recorded magnetic signals and capable of recording magnetic signals by a thermally assisted magnetic recording system in which a magnetic recording layer of the magnetic recording medium contains ferromagnetic crystal grains of a Co—Ni—Pt alloy with a Pt content of 44 at % or more and 55 at % or less and with an atom content ratio: Ni/(Co+Ni) of 0.64 or more and 0.8 or less. The magnetic recording medium has extremely excellent stability of recorded magnetic signals since the Co—Ni—Pt alloy constituting the magnetic recording layer has an extremely high anisotropy field at a normal temperature. Further, the magnetic recording medium can perform signal recording based on the thermally assisted magnetic recording system since the Co—Ni—Pt alloy constituting the magnetic recording layer has a Curie point within an appropriate temperature range.

Abstract: Metal alloy heatsink films for magnetic recording media are disclosed. The metal alloy heatsink films possess both high thermal conductivity and improved mechanical properties such as relatively high hardness. The metal alloy heatsink films also have controlled microstructures which are compatible with subsequently deposited crystalline magnetic recording layers. The films may comprise single phase CuZr or AgPd alloys having a selected crystal structure and orientation. The combination of high thermal conductivity, good mechanical properties and controlled microstructures makes the metal alloy heatsink films suitable for various applications including heat assisted magnetic recording systems.

Abstract: Embodiments of the present invention provide a magnetic disk drive capable of allowing higher data transfer rates and higher recording densities. According to one embodiment, an upper magnetic core and lower magnetic core comprise a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is about 30±1° C., pH is about 2.0?1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Since each layer's crystal structure is different from that of its adjacent lower layer, epitaxial growth is broken within each layer.

Abstract: According to one embodiment, a multilayered nonmagnetic underlayer is provided under a perpendicular magnetic recording layer, which has a structure in which a nonmagnetic template layer consisting of ruthenium and silicon is formed between a first nonmagnetic underlayer consisting of one of ruthenium and a first ruthenium alloy sputtered in an inert gas ambient, and a second nonmagnetic underlayer consisting of one of ruthenium and a second ruthenium alloy sputtered in an inert gas ambient at a pressure higher than that when sputtering the first nonmagnetic underlayer.

Abstract: A magnetic recording medium used for the thermally assisted magnetic recording system which fires a laser beam at a magnetic recording medium to partially heat the medium and applies a magnetic field from the outside to the part heated to lower the coercivity for recording. The magnetic recording medium is configured by a glass substrate on which a heat radiation layer, heat retention layer, intermediate layer, and recording layer are stacked. Further, the heat retention layer is configured by a member having an effective refractive index lower than the effective refractive index of the recording layer and having an temperature diffusion coefficient determined by the specific heat, density, and heat conductivity rate higher than glass and lower than metal. The material with a high temperature diffusion coefficient is used lowered in temperature diffusion coefficient using a porous structure or granular structure.

Abstract: A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within carbon nanotubes, which are arranged in a substrate to facilitate the reading and writing of information by a read/write head. The substrate may be flexible or rigid. Information is stored on the magnetic nanoparticles via the read/write head of a storage device. These magnetic nanoparticles are arranged into data tracks to store information through encapsulation within the carbon nanotubes. As carbon nanotubes are bendable, the carbon nanotubes may be arranged on flexible or rigid substrates, such as a polymer tape or disk for flexible media, or a glass substrate for rigid disk. A polymer may assist holding the nano-particle filled carbon-tubes to the substrate.

Abstract: An object of the invention is to provide a magnetic recording medium which exhibits an excellent corrosion resistance. To this end, proposed is a magnetic recording medium including a magnetic recording layer in which: a magnetic body and a filling body alternately appear along a recording surface; and a layer made of a passivated metal or an alloy containing at least one passivated metal is formed in an interface portion between an area of the magnetic body and an area of the filling body.

Abstract: To provide patterned media having novel structure. Plural convex members 2991 are provided in an array form on a substrate 2990. The convex member has a shape such that the cross section at each plane in parallel to the substrate tapers toward the substrate. Magnetic recording layers 2992 are provided on upper parts 2993 of the convex members so that they are not in contact with each other between the adjacent upper surface parts.

Abstract: [Problems] To provide a process for producing a magnetic recording medium, which can simultaneously realize increased high recording density, high impact resistance, and prevention of corrosion, by providing an underlayer which, even when formed at a low gas pressure, can exhibit a high level of coercive force. [Means for Solving Problems] A process for producing a perpendicular magnetic recording medium, comprising the step of forming a nonmagnetic underlayer (18) having a granular structure, in which crystal particles are grown in a column form, on a substrate, and forming a magnetic recording layer (20) having a granular structure in which magnetic particles are grown in a column form. The process is characterized in that the underlayer (18) is any one of CoCr or CoCrX (wherein X is a nonmagnetic material), CoCr-oxide, and CoCrX-oxide, and the film forming gas pressure of the underlayer (18) is not more than 4 Pa.

Abstract: An exemplary magnetic recording medium with a high recording density and a low medium noise is provided. The magnetic recording medium includes a non-magnetic substrate, a soft magnetic layer, an oxygen-containing intermediate layer, and a perpendicular magnetic recording layer, arranged in contact with one another, in that particular order. The perpendicular magnetic recording layer has a composite layer structure with ferromagnetic grains and a matrix of an amorphous carbon-containing structure. The amorphous carbon-containing structure is dispersed so as to essentially surround the individual ferromagnetic grains, within the perpendicular magnetic recording layer. Methods for making such magnetic recording media also are provided.

Abstract: A method is described for improving recording performance of a perpendicular media. The method includes controlling the anisotropy levels in different sublayers of the magnetic recording layers of the perpendicular media. Further, the different sublayers thicknesses can be altered to match the media to a particular head.

Abstract: Perpendicular magnetic recording media and methods of fabricating perpendicular magnetic recording media are described. The perpendicular magnetic recording medium of one embodiment includes an interlayer, an underlayer, and a perpendicular magnetic recording layer. The interlayer is formed from a NiWCr alloy.

Abstract: A perpendicular magnetic recording medium is disclosed that includes a substrate; a soft magnetic underlayer formed on the substrate; a seed layer of an amorphous material formed on the soft magnetic underlayer; an oxidation prevention layer formed on the seed layer; an underlayer formed on the oxidation prevention layer, the underlayer including multiple crystal grains formed of Ru or a Ru alloy having an hcp crystal structure, and a first air gap part configured to separate the crystal grains from each other; and a recording layer formed on the underlayer, the recording layer including multiple magnetic particles having a magnetocrystalline easy axis in a direction substantially perpendicular to the surface of the substrate, and one of a second air gap part and a non-magnetic non-solid-solution phase, the one being configured to separate the magnetic particles from each other. The oxidation prevention layer includes a noble metal element other than Ru.

Abstract: A method is described for improving recording performance of a perpendicular media. The method includes using a dual oxide layer as a sublayer of a magnetic recording layer of the perpendicular media. The dual oxide sublayer improves recording performance, increases resistance to corrosion and allows for a thinner exchange break layer. The dual oxide layer generally includes oxides of tantalum and one of silicon or boron.

Abstract: Improvements to magnetic recording device including magnetic recording media are described. The improvements include the addition of copper to the recording layer as well as improved underlayers. In addition, improved manufacturing processes and magnetic/recording properties for media through heating and oxidation are described.

Abstract: A method of fabricating a patterned magnetic recording medium, comprises steps of: (a) providing a layer stack including an uppermost non-magnetic interlayer; (b) forming a resist layer on the interlayer; (c) forming a first pattern comprising a first group of recesses extending through the resist layer and exposing a first group of spaced apart surface portions of the interlayer; (d) filling the first group of recesses with a layer of a hard mask material; (e) selectively removing the resist layer to form a second pattern comprising a second group of recesses extending through the hard mask layer and exposing a second group of spaced apart surface portions of the interlayer; and (f) filling the second group of recesses with a layer of a magnetically hard material forming a magnetic recording layer.

Abstract: In a perpendicular magnetic recording medium, a multilayered underlayer including a first metal underlayer, a second metal underlayer having no solid solution properties with respect to the first metal underlayer and having a hole, and a third metal underlayer having solid solution properties with respect to the first metal underlayer and having no solid solution properties with respect to the second metal underlayer is formed on a substrate, and a magnetic recording layer is formed on the multilayered underlayer.

Abstract: A perpendicular magnetic recording medium is provided, which has a backing layer, a primer layer, an intermediate layer and at least one perpendicular magnetic recording layer, and is characterized in that the perpendicular magnetic recording layer contains Co and Cr, and at least one of the perpendicular magnetic recording layer or layers has a granular structure comprising ferromagnetic crystal grains and grain boundaries comprised of non-magnetic tungsten oxide. The perpendicular magnetic recording layer may be a double-layered structure comprising the tungsten oxide grain boundary-containing layer and a Cr oxide, Si oxide, Ta oxide or Ti oxide grain boundary-containing layer formed on the tungsten oxide grain boundary-containing layer. The perpendicular magnetic recording medium exhibits good perpendicular orientation and has ferromagnetic crystal grains with extremely small grain size, and thus, is superior in high recording density characteristic.

Abstract: Improvements to magnetic recording device including magnetic recording media are described. The improvements include the addition of copper to the recording layer as well as improved underlayers. In addition, improved manufacturing processes and magnetic/recording properties for media through heating and oxidation are described.

Abstract: Embodiments of the invention relate to easily achieving a perpendicular magnetic recording medium with high reliability and a magnetic recording apparatus with high recording density by improving the magnetic properties and surface smoothness of the soft magnetic underlayer and, moreover, enhancing adhesion with the substrate.

Abstract: The present invention provides a magnetic recording medium which is capable of improving the perpendicular orientation of a perpendicular magnetic recording layer while maintaining a writing performance during recording and obtaining both an improvement in the perpendicular orientation and fine magnetic crystal particles with a uniform diameter, and which enables information to be recorded or reproduced at high density, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. A magnetic recording medium 10 according to the present invention includes at least a soft magnetic underlayer 2, an orientation control layer 3, a magnetic recording layer 4, and a protective layer 5 formed on a non-magnetic substrate 1. The orientation control layer 3 has a seed layer 6 and an intermediate layer 7. The seed layer 6 is made of a Cu—Ti alloy that has a face-centered cubic structure and includes Cu as a main component.

Abstract: The invention relates to a perpendicular magnetic recording medium having a substrate and a seed layer comprising a Ni alloy.

Abstract: The invention uses an adhesion layer of an amorphous alloy of aluminum. A first aluminum titanium embodiment of the amorphous adhesion layer preferably contains approximately equal amounts of aluminum and titanium (+/?5 at. %). A second embodiment of the amorphous adhesion layer preferably contains approximately equal amounts of aluminum and titanium (+/?5 at. %) and up to 10 at. % Zr with 5 at. % Zr being preferred. A third embodiment is aluminum tantalum preferably including from 15 to 25 at. % tantalum with 20 at. % being preferred. The most preferred compositions are Al50Ti50, Al47.5Ti47.5Zr5 or Al80 Ta20. The adhesion layer is deposited onto the substrate. The substrate can be glass or a metal such as NiP-plated AlMg. The preferred embodiment of media according to the invention is for perpendicular recording and includes a magnetically soft underlayer deposited above the adhesion layer.

Abstract: The invention relates to a perpendicular magnetic recording medium comprising a substrate and a granular magnetic layer comprising ruthenium or ruthenium oxide in the grain boundaries.

Abstract: A perpendicular magnetic recording medium includes a nonmagnetic seed layer, a nonmagnetic intermediate layer provided on the nonmagnetic seed layer, and a perpendicular recording layer provided on the nonmagnetic intermediate layer. The nonmagnetic seed layer includes a first seed layer made of a Ni alloy having a fcc structure, and a second seed layer provided between the first seed layer and the nonmagnetic intermediate layer and made of a Ni alloy having a fcc structure. A content of one or more elements other than Ni within the Ni alloy forming the second seed layer and having a Goldschmidt radius greater than that of Ni is larger than a content of one or more elements other than Ni within the Ni alloy forming the first seed layer and having a Goldschmidt radius greater than that of Ni.

Abstract: A perpendicular magnetic recording medium includes a nonmagnetic seed layer, a nonmagnetic intermediate layer provided on the nonmagnetic seed layer, and a perpendicular recording layer provided on the nonmagnetic intermediate layer. The nonmagnetic seed layer includes a first seed layer made of an amorphous material, and a second seed layer provided between the first seed layer and the nonmagnetic intermediate layer and made of a material having a fcc structure. The amorphous material includes at least one element selected from a group consisting of Ta, W, Nb, Mo, Zr and alloys thereof which include at least one of Ta, W, Nb, Mo and Zr as a main component exceeding 50 at. %.

Abstract: In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.

Abstract: A perpendicular magnetic recording medium is provided with a substrate, a soft magnetic back layer provided on a surface of the substrate, an orientation controlling underlayer provided on the soft magnetic back layer, and a recording layer provided above the orientation controlling underlayer and having axes of easy magnetization approximately perpendicular to the surface of the substrate. The recording layer is made of a ferromagnetic material having an hcp crystal structure. The orientation controlling underlayer is made of a nonmagnetic material having an fcc crystal structure and having NiCr or NiCu as a main component.

Abstract: A perpendicular magnetic recording medium includes: a substrate; a soft magnetic film formed on the substrate; a non-magnetic film including an amorphous interlayer formed on the soft magnetic film and made from a metallic material selected from terbium, gadolinium, dysprosium, tantalum, hafnium, and combinations thereof, a buffer layer formed on the amorphous interlayer and having a face-centered cubic structure, and a seed layer formed on the buffer layer and having a hexagonal crystal structure; and a granular magnetic recording film formed on the seed layer.

Abstract: A perpendicular magnetic recording medium includes a nonmagnetic substrate; a first underlayer provided on the nonmagnetic substrate; a first nonmagnetic intermediate layer provided on the first underlayer; a second underlayer provided on the first nonmagnetic intermediate layer; a second nonmagnetic intermediate layer provided on the second underlayer; and a magnetic recording layer provided on the second nonmagnetic intermediate layer, wherein the first underlayer comprises a soft magnetic material which has a face-centered cubic structure and which includes at least Ni and Fe, and wherein the second underlayer comprises a soft magnetic material which has a face-centered cubic structure and which includes at least Co.

Abstract: A magnetic recording medium includes a continuous recording layer, and a seed layer including a surface held in contact with the recording layer. The seed layer includes an oxidized region and a non-oxidized region in the surface held in contact with the recording layer. The recording layer includes a recording magnetic region and a non-recording magnetic region. The recording magnetic region corresponds in position to the non-oxidized region and has perpendicular magnetic anisotropy. The non-recording magnetic region corresponds in position to the oxidized region.

Abstract: A method for defining magnetic domains in a magnetic thin film on a substrate, includes: coating the magnetic thin film with a resist; patterning the resist, wherein areas of the magnetic thin film are substantially uncovered; and exposing the magnetic thin film to a plasma, wherein plasma ions penetrate the substantially uncovered areas of the magnetic thin film, rendering the substantially uncovered areas non-magnetic.

Abstract: A contact magnetic transfer (CMT) master template has a flexible plastic film with a planarized top or upper surface containing magnetic islands separated from one another by nonmagnetic regions. The flexible plastic film is secured at its perimeter to a silicon annulus that provides rigid support at the perimeter of the film. The plastic film is preferably polyimide that has recesses filled with the magnetic material that form the pattern of magnetic islands. The upper surfaces of the islands and the upper surfaces of the nonmagnetic regions form a continuous planar surface. The nonmagnetic regions are formed of chemical-mechanical-polishing (CMP) stop layer material that remains after a CMP process has planarized the upper surface of the plastic film.

Abstract: A method for manufacturing a patterned magnetic recording medium that allows processing only required sites with high precision, in a dry etching process during formation of an uneven pattern in an interlayer. The method includes forming sequentially, on a substrate, a soft magnetic layer, an etching stop layer, a seed layer, an interlayer, a hard mask layer and a resist; obtaining a resist pattern by patterning the resist; obtaining a patterned hard mask layer by etching the hard mask layer using the resist pattern as a mask; stripping the resist pattern; obtaining a patterned interlayer by etching the interlayer using the patterned hard mask layer as a mask; stripping the patterned hard mask layer; and forming a magnetic recording layer by forming a perpendicular orientation section on the patterned interlayer, and forming a random orientation section on the seed layer.

Abstract: The invention provides a structured material composed by including a noble metal, in which an oriented layer is formed on a layer containing a Group 4A metal. The invention enables to form an oriented layer, which has required a high temperature for formation, by a low temperature process.

Abstract: The present invention relates to a magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The magnetic layer has a thickness ranging from 30 to 130 nm, and a glossiness of the magnetic layer surface ranges from 155 to 270 percent.

Abstract: A magnetic recording medium is provided in the present invention. The magnetic recording medium including a substrate; a base layer disposed on the substrate; an intermediate layer disposed on the base layer; and a recording layer disposed on the intermediate layer and including a magnetic matrix and a plurality of non-magnetic particles percolated in the magnetic matrix.

Abstract: A magnetic recording medium includes an orientation adjusting layer, a nonmagnetic under layer, a nonmagnetic intermediate layer, a magnetic layer and a protective layer sequentially stacked on a nonmagnetic substrate provided on a first surface thereof with a texture streak and used for a magnetic disc. The nonmagnetic under layer contains at least a layer formed of a Cr—Mn-based alloy and possesses magnetic anisotropy having an axis of easy magnetization in a circumferential direction thereof. A magnetic recording and reproducing device includes the magnetic recording medium and a magnetic head for enabling information to be recorded in and reproduced from the magnetic recording medium.