摘要:
The magnetic storage apparatus has a high reliability at a recording density of 2 gigabits or more per square inch. The longitudinal recording media necessary to realize the apparatus has a low media noise and is immune from the influence of thermal fluctuations. The magnetic storage apparatus has a longitudinal magnetic recording media including a magnetic layer which is formed on a substrate via a multi-layered underlayer; a driver for driving the recording media in a recording direction; a magnetic head including a recording section and a read-back section; a driver for moving the magnetic head relatively with respect to the longitudinal magnetic recording media; and a read/write signal processor for processing input signals to the magnetic head and output signal read-back therefrom. The read-back section of the magnetic head includes a magnetoresistive head. One layer of the multi-layered underlayer in the longitudinal magnetic recording media which is in contact with the magnetic layer has a substantially hexagonal close-packed (hcp) structure and has crystal grains whose c-axes are substantially parallel with the substrate plane.
摘要:
A magnetic recording system high in S/N and low in bit error rate, capable of carrying out writing and reading of high recording density of at least 1 gigabit per 1 square inch and high in reliability can be realized by making the magnetic layer of the magnetic recording medium from a mixture comprising at least one non-magnetic compound selected from the group consisting of oxides and nitrides and a magnetic material comprising Co and Pt as main components and specifying the molar ratio of Pt to Co in the magnetic layer, and employing a magnetoresistive read back magnetic recording head.
摘要:
A magnetic recording system high in S/N and low in bit error rate, capable of carrying out writing and reading of high recording density of at least 1 gigabit per 1 square inch and high in reliability can be realized by making the magnetic layer of the magnetic recording medium from a mixture comprising at least one non-magnetic compound selected from the group consisting of oxides and nitrides and a magnetic material comprising Co and Pt as main components and specifying the molar ratio of Pt to Co in the magnetic layer, and employing a magnetoresistive read back magnetic recording head.
摘要:
A magnetic recording medium capable of reducing noise and an error rate of the medium comprises a nonmagnetic substrate; a magnetic layer formed on the surface of the nonmagnetic substrate directly or through a nonmagnetic underlayer; and a protective layer formed on the magnetic layer. The magnetic recording medium satisfies the following relationships: −0.5≦{Hc(1)−Hc(p)}/Hc(1)≦0.3 Hc(1)≧2 kOe 20 G×&mgr;m≦Br(1)×t≦100 G×&mgr;m where Hc(1) is a corecivity of the magnetic layer measured in the longitudinal direction; Hc(p) is a coercivity of the magnetic layer measured in the perpendicular direction; Br(1) is a remanent magnetization of the magnetic layer measured in the longitudinal direction; and “t” is a layer thickness of the magnetic layer.
摘要:
A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta. of the residual flux density Br of the magnetic layer determined in the recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 80 G.mu.m; and the value of the anisotropic magnetic field H.sub.k of the magnetic recording medium is not less than 7 kOe and not more than 20 kOe.
摘要:
Disclosed is a magnetic recording medium capable of reducing noise and an error rate of the medium. The medium comprises a nonmagnetic substrate; a magnetic layer formed on the surface of the nonmagnetic substrate directly or through a nonmagnetic underlayer; and a protective layer formed on the magnetic layer; wherein the magnetic recording medium satisfies the following relationships: −0.5≦{Hc(1)−Hc(p)}/Hc(1)≦0.3 Hc(1)≧2 kOe 20 G×&mgr;m≦Br(1)×t≦100 G×&mgr;m where Hc(1) indicates a corecivity of the magnetic layer measured in the longitudinal direction; Hc(p) indicates a coercivity of the magnetic layer measured in the perpendicular direction; Br(1) indicates a remanent magnetization of the magnetic layer measured in the longitudinal direction; and “t” indicates a layer thickness of the magnetic layer.
摘要:
It is an object of the present invention to provide a magnetic recording medium which has a high level of magnetic antisotropy energy, retains stably the state of recording magnetization within the operating temperature range and is suitable for high-density recording with a low noise level, and a magnetic storage device for the magnetic recording medium. For attaining the above object, the magnetic recording film of the magnetic recording medium is characterized in that its magnetic anisotropy energy constant Ku at an absolute temperature of 300 K is greater than 3.6×106 erg/cc and the average particle diameter is larger than 5 nm and smaller than 12 nm.
摘要翻译:本发明的目的是提供一种具有高水平的磁性反向能量的磁记录介质,将记录磁化的状态稳定地保持在工作温度范围内,并适用于具有低噪声水平的高密度记录, 以及用于磁记录介质的磁存储装置。 为了实现上述目的,磁记录介质的磁记录膜的特征在于其绝对温度为300K的磁各向异性能常数Ku大于3.6×10 6 / g / cc,平均粒径较大 超过5nm且小于12nm。
摘要:
It is an object of the present invention to provide a magnetic recording medium which has a high level of magnetic anisotropy energy, retains stably the state of recording magnetization within the operating temperature range and is suitable for high-density recording with a low noise level, and a magnetic storage device for the magnetic recording medium. For attaining the above object, the magnetic recording film of the magnetic recording medium is characterized in that its magnetic anisotropy energy constant Ku at an absolute temperature of 300 K is greater than 3.6×106 erg/cc and the average particle diameter is larger than 5 nm and smaller than 12 nm.
摘要:
A magnetic recording medium has a substrate made of a nonmetal nonmagnetic material whose coefficient of linear expansion lies within a range from 0.000013/deg to 0.0001/deg. A magnetic layer is formed on the substrate as a thin polycrystalline film or a thin amorphous film. The magnetic layer has Co as a main component, which exhibits a negative magnetostrictive constant so that its coercive force rises in the direction of compressive strain. The magnetic layer is subjected to an in-plane compressive strain from the substrate due to a difference between the coefficient of thermal expansion of the substrate and the magnetic layer so that high coercivity is obtained in the magnetic layer.
摘要:
A magnetic head, according to one embodiment, includes a microwave generator provided with a main magnetic pole, an auxiliary magnetic pole, a coil wound around a magnetic circuit, the magnetic circuit including the main magnetic pole and the auxiliary magnetic pole, and a magnetic film, the film being provided near an ABS side of the main magnetic pole. A first distance in an element thickness direction between film surfaces of the magnetic film and the main magnetic pole at a top end in an element height direction of the microwave generator is greater than a second distance between film surfaces of the magnetic film comprising the microwave generator and the main magnetic pole at the ABS. In other approaches, the main magnetic pole may have a shape which gradually widens from a flare point away from the ABS in an element height direction. Additional systems and methods are also presented.