Abstract: A magnetic recording medium includes a non-magnetic granular layer, and a recording layer provided on the non-magnetic granular layer, wherein the recording layer includes a first granular magnetic layer provided on the non-magnetic granular layer, and a second granular magnetic layer provided on the first granular magnetic layer, and a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer.

Abstract: A magnetic recording medium includes a non-magnetic granular layer, and a recording layer provided on the non-magnetic granular layer, wherein the recording layer includes a first granular magnetic layer provided on the non-magnetic granular layer, and a second granular magnetic layer provided on the first granular magnetic layer, and a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer.

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 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 magnetic recording medium includes; a base member; an underlayer formed on the base member; a main recording layer formed on the underlayer, and a writing assist layer formed on or under the main recording layer in contact with the main recording layer. The main recording layer has perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1. The writing assist layer has an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2. The anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 and a2>a1.

Abstract: A method for manufacturing a magnetic recording medium including a nonmagnetic substrate, an intermediate layer over the nonmagnetic substrate, and a granular magnetic layer for recording information, disposed on the intermediate layer. The method includes sputtering a Co alloy, a Ti oxide, a Si oxide and a Co oxide simultaneously to form the granular magnetic layer containing Co alloy magnetic particles and an oxide magnetically separating the magnetic particles.

Abstract: One aspect of the embodiments utilizes, according to an aspect of the invention, a method of manufacturing a magnetic recording medium, which includes an intermediate layer and a granular magnetic layer as a recording layer sequentially formed on a non-magnetic substrate, includes the steps of forming the intermediate layer and forming the granular magnetic layer. The granular magnetic layer includes a plurality of magnetic particles made of a Co alloy and an oxide magnetically separating the plurality of magnetic particles by a sputtering method using a target. The target includes a Co alloy, one or more first oxides selected from a group of oxides of Si, Ti, Ta, Cr, W, and Nb, and a second oxide composed of a Co oxide.

Abstract: A method of producing a magnetic recording medium produces a medium having a magnetic recording layer disposed above a nonmagnetic intermediate layer, The nonmagnetic intermediate layer is formed by a sputtering using a target made of an oxide material. Oxygen gas or carbon dioxide gas is supplied during the sputtering in order to suppress a state where an oxygen supply becomes insufficient due to separation of oxygen atoms from the oxide material at a time of plasma generation.

Abstract: A magnetic recording medium has a substrate, a first granular layer formed on the substrate, the first granular layer having a plurality of a first magnetic grains and a first oxide for separating the plurality of first magnetic grains from one another. A non-magnetic layer is formed on the first granular layer. The second granular layer is formed on the non-magnetic layer which has a plurality of second magnetic grains and a second oxide for separating the plurality of second magnetic grains from one another. The anisotropic magnetic field of the first granular layer is more intensive than that of the second granular layer.

Abstract: A magnetic recording medium used for a hard disc drive and the like, a method of manufacturing the same, and a magnetic storage device. The magnetic recording medium that includes a substrate, a first ferromagnetic layer formed on the substrate, a non-magnetic layer formed on the first ferromagnetic layer and including a ferromagnetic element and a second ferromagnetic layer formed on the non-magnetic layer, wherein the first ferromagnetic layer and the second ferromagnetic layer are magnetically coupled through the non-magnetic layer.

Abstract: This magnetic recording medium has a substrate, a nonmagnetic granular layer formed above the substrate and a recording layer formed on the nonmagnetic granular layer. The nonmagnetic granular layer is made of CoCr alloy with an hcp or an fcc crystal structure in which a nonmagnetic material segregates virtually-columnar magnetic grains. The magnetic recording medium and the magnetic storage apparatus in which the medium is used have improved reading/writing performances.

Abstract: According to an aspect of an embodiment, a magnetic recording medium includes a substrate, and a first granular layer formed over the substrate, the first granular layer having a plurality of first magnetic particles and Si oxide separating the plurality of first magnetic particles. The magnetic recording medium further includes a second granular layer formed over the first granular layer, the second granular layer having a plurality of second magnetic particles and Ti oxide separating the plurality of second magnetic particles.

Abstract: A magnetic recording medium has high corrosion resistance and high Bs, a method of manufacturing the magnetic recording medium, and a magnetic recording device. The magnetic recording medium using as a recording layer a magnetic layer has perpendicular magnetic anisotropy. A soft magnetic backing layer (upper and lower soft magnetic backing layers) formed under the recording layer is composed of a FeCoZr alloy added with at least one element of Ta and Nb and further added with Cr. This magnetic recording medium includes the soft magnetic backing layer having high corrosion resistance and high Bs and therefore, exhibits high Hc recording and high S/N performance.

Abstract: A magnetic recording medium according to the present invention includes a nonmagnetic base material, a soft magnetic under layer, an interlayer, a recording layer and a protective layer, which are stacked over the base material. The soft magnetic under layer is formed of a lower soft magnetic layer, a magnetic domain control layer (or a nonmagnetic layer) and an upper soft magnetic layer. The lower and upper soft magnetic layers are each made of a material amorphized by adding at least one of zirconium (Zr) and tantalum (Ta) to an iron-cobalt (Fe—Co) alloy which is composed to form a body-centered cubic (bcc) structure.

Abstract: An under layer, a FeCoB seed layer, a crystalline orientation control layer having an fcc structure, a non-magnetic underlying layer, a first recording layer, a second recording layer, and a protective layer are formed on a substrate. The under layer includes three layers: a first soft magnetic layer, a non-magnetic spacer layer, and a second soft magnetic layer. The first recording layer has a granular structure in which magnetic particles are dispersed in a non-magnetic material, and the second recording layer has a non-granular structure.

Abstract: According to the present invention, there is provided a magnetic recording medium 10 which includes: a non-magnetic base 1; a non-magnetic underlayer 3 formed on the non-magnetic base 1; a first recording layer 4 formed on the non-magnetic underlayer 3, the first recording layer 4 having a perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1, a thickness of t1, and a saturation magnetization of Ms1; and a second recording layer 5 formed above or under the first recording layer 4, the second recording layer 5 having a perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk2, a thickness of t2, and a saturation magnetization of Ms2, wherein the anisotropic magnetic fields Hk1 and Hk2, the thicknesses t1 and t2, and the saturation magnetizations Ms1 and Ms2 satisfy Hk2<Hk1 and (t2·Ms2)/(t1 Ms1)<1, respectively.

Abstract: According to the present invention, provided is a magnetic recording medium 11 comprising: a non-magnetism base member 1; a lower soft magnetic underlying layer 2 formed on the non-magnetism base member 1; a non-magnetic layer 4 formed on the lower soft magnetic underlying layer 2; an upper soft magnetic underlying layer 6 formed on the non-magnetic layer 4; and a recording layer 9 having a perpendicular magnetic anisotropy, the recording layer 9 being formed on the upper soft magnetic underlying layer 6, wherein crystalline magnetic layers 3 and 5 are formed between the lower soft magnetic underlying layer 2 and the non-magnetic layer 4 or between this non-magnetic layer 4 and the upper soft magnetic underlying layer 6.

Abstract: A magnetic recording medium includes; a base member; an underlayer formed on the base member; a main recording layer formed on the underlayer, and a writing assist layer formed on or under the main recording layer in contact with the main recording layer. The main recording layer has perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1. The writing assist layer has an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2. The anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 ?0 and a1>a2.

Abstract: A magnetic recording medium includes; a base member; an underlayer formed on the base member; a main recording layer formed on the underlayer, and a writing assist layer formed on or under the main recording layer in contact with the main recording layer. The main recording layer has perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1. The writing assist layer has an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2. The anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 and a2>a1.

Abstract: A magnetic recording medium including a ferromagnetic layer made of a Co-based alloy material, a nonmagnetic coupling layer formed on the ferromagnetic layer and made of Ru or a Ru-based alloy material, and a magnetic recording layer formed on the nonmagnetic coupling layer and made of a Co-based alloy material. The nonmagnetic coupling layer is formed by sputtering in an atmosphere of Ar—N2 mixed gas, so that the nonmagnetic coupling layer contains nitrogen. The partial pressure of nitrogen during the sputtering is set in the range of 6.7×10?3 to 3.7×10?2 Pa.