Abstract: A high-recording-density magnetic recording medium and a method of its manufacture can achieve a high OR with only a small reduction in Hcr. The magnetic recording medium has a nonmagnetic substrate and a first seed layer, a second seed layer, a first underlayer, a second underlayer, and a magnetic recording layer formed on the substrate in this order. The first seed layer can be a single layer or a plurality of layers made of at least one material selected from the group consisting of Ni—Ti alloys, Cr—Al alloys, Cr—Ta alloys, and Cr—Ti alloys. The second seed layer can be a single layer or a plurality of layers made of at least one material selected from the group consisting of Ni—W alloys, Ni—Ru—W alloys, and Co—W alloys. The first underlayer can be a single layer or a plurality of layers made of a Cr—Ru alloy. The second underlayer can be a single layer or a plurality of layers made of a Cr alloy comprising Cr and at least one element selected from the group consisting of Mo, B, Ti, and W.

Abstract: A magnetic recording medium and method of manufacturing the same including directly texturing a surface of a non-magnetic substrate made of a glass material to form circular concentric grooves thereon, forming a seed layer on the non-magnetic substrate, forming an under layer on the seed layer, forming a magnetic layer on the under layer, and forming a protective layer on the magnetic layer. A ratio of an in-plane remanent magnetization in a circumferential direction of the magnetic recording medium to an in-plane remanent magnetization in a radial direction of the magnetic recording medium is equal to or greater than 1.05.

Abstract: A perpendicular magnetic recording medium and method with reduced media noise has an under-layer, an intermediate layer with an amorphous structure, a recording layer, a protective layer, and a liquid lubricant layer sequentially laminated on a substrate. By providing the amorphous intermediate layer, the recording layer, which is formed on the intermediate layer, is made to have a fine grain size and a uniform grain size distribution. A perpendicular magnetic recording medium and method of the invention can be alternatively provided with an intermediate layer consisting of an amorphous layer and a crystalline layer.

Abstract: A perpendicular magnetic recording medium and method with reduced media noise has an under-layer, an intermediate layer with an amorphous structure, a recording layer, a protective layer, and a liquid lubricant layer sequentially laminated on a substrate. By providing an amorphous intermediate layer, the recording layer, which is formed on the intermediate layer, is made to have a fine grain size and a uniform grain size distribution.

Abstract: A magnetic recording medium and method of manufacturing the same including directly texturing a surface of a non-magnetic substrate made of a glass material to form circular concentric grooves thereon, forming a seed layer on the non-magnetic substrate, forming an under layer on the seed layer, forming a magnetic layer on the under layer, and forming a protective layer on the magnetic layer. A ratio of an in-plane remanent magnetization in a circumferential direction of the magnetic recording medium to an in-plane remanent magnetization in a radial direction of the magnetic recording medium is equal to or greater than 1.05.