Abstract: A magnetic recording medium includes a metal thin-film magnetic layer formed on a non-magnetic substrate. The metal thin-film magnetic layer is formed so that the coercivity measured when a magnetic field is applied with an angle of intersection of 120° between the plane of the non-magnetic substrate and magnetic field lines of the magnetic field and the coercivity measured when the magnetic field is applied with the angle of intersection of 60° are both at least 160 kA/m.

Abstract: A magnetic recording medium includes a first metal thin-film magnetic layer and a second metal thin-film magnetic layer, which respectively include a plurality of columns and have magnetization easy axes that are inclined in opposite directions, formed in that order on a non-magnetic substrate. Both metal thin-film magnetic layers include former growth portions that comprise base end parts of the respective columns and latter growth portions that comprise remaining parts of the respective columns on front-end sides of the columns. The former growth portions are formed by the columns growing in a thickness direction of the non-magnetic substrate. The latter growth portions are formed by the columns growing so as to become inclined to a length of the non-magnetic substrate and arc-shaped in profile.

Abstract: A thin-film forming method feeds out a belt-shaped web from a roll produced by winding the web and causes the web to run around a cooling drum while simultaneously forming a thin film on the web by vapor-phase deposition. A roll with a rebound hardness of no greater than 691L is used as the roll and a thin-film forming surface of a part of the web in contact with the cooling drum is irradiated with an electron beam.

Abstract: The present invention provides a magnetic recording medium having a thinned film back coating layer as well as suppressed tribocharging by sliding to the tape guide pin on running, and having excellent running durability. The present invention also provides a magnetic recording/reproducing system using the magnetic recording medium above. A magnetic recording medium 1 which comprises at least a magnetic layer 3 and a protective layer 4 comprising a hard film containing carbon as a principal component in this order on one surface of a non-magnetic support 2, and comprises a metal layer 7 from 1 to 50 nm in thickness and a back coating layer 6 comprising a hard film containing carbon as a principal component in this order on the other surface of said non-magnetic support 2.

Abstract: The present invention provides a magnetic recording medium having a thinned film back coating layer as well as suppressed tribocharging by sliding to the tape guide pin on running, and having excellent running durability, and a method for producing the same. A magnetic recording medium which comprises at least a magnetic layer 3 and a protective layer 4 comprising a hard film containing carbon as a principal component in this order on one surface of a non-magnetic support 2, and comprises a back coating layer 6 comprising a hard film containing carbon as a principal component on the other surface of said non-magnetic support 2, wherein a surface of said back coating layer 6 has a three-dimension center surface roughness SRa in a range of 3 to 7 nm and a three-dimension ten-point average roughness SRz in a range of 30 to 55 nm.

Abstract: A magnetic recording medium comprising at least a lower non-magnetic layer containing at least a non-magnetic powders and a binder resin formed on a non-magnetic support and an upper magnetic layer formed on the lower non-magnetic layer, wherein the magnetic recording medium is used for a recording-reproducing system in which recorded signals are reproduced by an MR head, and a plastic deformation hardness Hv from the upper magnetic layer surface to an indentation depth of 0.1 &mgr;m is 100 to 200 mgf/&mgr;m2and a Young's modulus E in a thickness direction from the upper magnetic layer surface to the indentation depth of 0.1 &mgr;m is 2000 to 3000 mgf/&mgr;m2.

Abstract: A conventional film-type magnetic recording medium having a overall thickness of 7 &mgr;m or less has unsatisfactory stiffness, and when surface undulations are suppressed and the thickness of the substrate is reduced, clogging at the rotary head is frequently observed. The invention solves this problem by a tape-type magnetic recording medium which comprises a nonmagnetic substrate and at least a magnetic layer thereon and has the overall thickness of 7 &mgr;m or less, wherein the width of the tape is 6.5 mm or more and the difference in the centerplane average roughness (SRa) of said magnetic layer is in the range defined below: 3 nm≦SRa (Cutoff: 800 &mgr;m)−SRa (Cutoff: 80 &mgr;m)≦15 nm Especially, the nonmagnetic substrate is an aromatic polyamide.

Abstract: A magnetic recording medium includes a flexible substrate, a coating layer formed on the flexible substrate, and a magnetic layer formed on the coating layer. The coating layer contains a binder and nonmagnetic particles and has a thickness in the range of 0.05 to 0.7 .mu.m as a result of a stretching treatment performed at least once after application of the coating layer on the flexible substrate. The magnetic layer contains magnetic powder, a binder and an abrasive and has a thickness in the range of 0.05 to 1.0 .mu.m. The nonmagnetic particles contained in the coating layer has an average particle size in the range of 0.01 to 0.08 .mu.m. The abrasive contained in the magnetic layer has an average particle size in the range of 0.05 to 0.8 .mu.m and satisfies conditions defined by the following equations (1) and (2):d.sub.mx .ltoreq.(d.sub.av .times.2.0)+0.5 equation (1)d.sub.mx .ltoreq.t.sub.c +t.sub.m +0.5 equation (2)wherein d.sub.mx represents a maximum particle size of the abrasive, d.sub.

Abstract: This invention concerns a magnetic recording medium which comprises a nonmagnetic support, a magnetic layer provided on one surface of the nonmagnetic support and a backcoat layer provided on the other surface of the nonmagnetic support, wherein the nonmagnetic support is provided with such physical properties as Young's moduluses in the longitudinal direction and the lateral direction thereof in the range of 1300-1600 kg/cm.sup.2, respectively, and a breaking elongation in the range of 3-10% and said magnetic recording medium is provided on the magnetic layer side thereof with a convex cupping the magnitude of which is in the range of 0.02-0.20 mm at a width of 3.8 mm.The magnetic recording medium, therefore, realizes perfect head touch even when the thickness of the nonmagnetic support and the thickness of the whole medium are small.

Abstract: Disclosed is a magnetic recording medium comprising a nonmagnetic support and a paint film layer which is provided on the support and has a lamination structure consisting of two or more layers, wherein the top surface magneticlayer of the layers constituting the paint film layer contains abrasive particles having a Mohs hardness of not less than 6 in an amount of 3 to 16 parts by weight based on 100 parts by weight of a ferromagnetic powder and has a thickness of not more than 0.5 .mu.m, a ratio of a mean particle diameter of the abrasive particles to the thickness of the top surface magnetic layer is in the range of 1.0 to 1.8, and a content of the abrasive particles each having a size larger than the thickness of the top surface magnetic layer in the particle size distribution of the abrasive particles is in the range of 50 to 90% by weight.