Abstract: A magnetic recording medium is provided with an hcp Co alloy magnetic layer with the crystallographic c-axes tilted at an angle from a substrate surface and fixed relative to a recording direction. The tilt is induced by epitaxial growth of the hcp Co alloy on an obliquely evaporated nonmagnetic polycrystalline underlayer, so that the magnetic recording medium exhibits thermal stability and improved overwrite with a single pole-type head.

Abstract: The magnet assembly includes one rotatable dipole magnet subassembly, which is formed from a permanent magnet and a magnetically permeable convex end portion coupled to each of both ends of the permanent magnet, and at least two magnetically permeable flux guide subassemblies, which are configured so as to be magnetically coupled to the dipole magnet subassembly. The flux guide subassembly has a concave end portion that fits into the convex end portion. The flux guide assemblies guide a flux from the dipole magnet subassembly and generate a flux outside. The condition of fitting into the flux guide subassemblies is reversed by rotating the dipole magnet subassembly, whereby it is possible to easily reverse the direction of a magnetic field generated outside.

Abstract: A magnetic recording medium is provided with a substrate, a recording magnetic layer made of a CoCr alloy and having a (11 20) crystallographic texture, and an underlayer, made of an AlV or AlRuV alloy, disposed between the substrate and the magnetic layer.

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be anti-parallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract: A magnetic recording medium includes a substrate, a magnetic recording layer made of a Co alloy or a CoCr alloy, a seed layer disposed between the substrate and the magnetic recording layer, and an underlayer made of a binary alloy material having a B2 structure and disposed between the seed layer and the magnetic recording layer. The seed layer is made of a material comprising essentially of one of elements forming the binary alloy material of the underlayer.

Abstract: A magnetic recording medium includes a nonmagnetic underlayer, an initial magnetic layer, a nonmagnetic spacer layer provided on the initial magnetic layer, and a final magnetic layer provided on the nonmagnetic spacer layer. The initial magnetic layer is disposed closer to the nonmagnetic underlayer than the final magnetic layer, and the initial and final magnetic layers are made of mutually different compositions and are anti-ferromagnetically coupled.

Abstract: A magnetic recording medium is constructed to include a substrate, a magnetic layer made of a Co or Co-based alloy, and an underlayer disposed between the substrate and the magnetic layer. The underlayer is made of an ordered intermetallic material of FCC L12 or FCT L10 crystalline structure, so that c-axis of the magnetic layer is aligned in a predetermined direction.

Abstract: A magnetic recording medium is constructed to include at least one exchange layer structure, and a magnetic layer formed on the exchange layer structure, where the exchange layer structure comprises a ferromagnetic layer, and a non-magnetic coupling layer provided on the ferromagnetic layer and under the magnetic layer. The ferromagnetic layer and the magnetic layer have antiparallel magnetizations. The non-magnetic coupling layer is made of a Ru-M3 alloy, where M3 is an added element or alloy, and a lattice mismatch between the non-magnetic coupling layer and the magnetic layer and the ferromagnetic layer respectively disposed above and below the non-magnetic coupling layer is adjusted to approximately 6% or less by addition of M3.

Abstract: A magnetic storage medium includes first and second magnetic layers provided on a support substrate such that the first and second magnetic layers have respective first and second magnetizations in an anti-parallel relationship in a state no substantial writing magnetic field is applied. The first and second magnetizations are changed to a parallel relationship when a writing magnetic field is applied to the magnetic storage medium, and the first and second magnetizations are changed to the anti-parallel relationship as a result of a magnetic reversal caused in the second magnetic layer with diminishing of the writing magnetic field. The reversal is caused as a result of the action of a reversing magnetic field that dominates before the writing magnetic field is diminished and becomes zero.

Abstract: A magnetic recording medium is provided with at least one exchange layer structure, and a magnetic layer formed on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer and under the magnetic layer.

Abstract: A magnetic recording medium is constructed to include at least one exchange layer structure and a magnetic layer provided on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer. At least one of the ferromagnetic layer and the magnetic layer has a granular layer structure in which ferromagnetic crystal grains are uniformly distributed within a non-magnetic base material.

Abstract: A magnetic recording medium includes a nonmagnetic underlayer, an initial magnetic layer, a nonmagnetic spacer layer provided on the initial magnetic layer, and a final magnetic layer provided on the nonmagnetic spacer layer. The initial magnetic layer is disposed closer to the nonmagnetic underlayer than the final magnetic layer, and the initial and final magnetic layers are made of mutually different compositions and are anti-ferromagnetically coupled.

Abstract: A magnetic recording medium is constructed to include at least one exchange layer structure and a magnetic layer provided on the exchange layer structure, where the exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer, and a magnetic bonding layer provided between the ferromagnetic layer and the non-magnetic coupling layer and/or between the non-magnetic coupling layer and the magnetic layer, wherein the magnetic bonding layer has a magnetization direction parallel to the ferromagnetic layer and the magnetic layer.

Abstract: A magnetic recording medium is constructed to include a substrate, a magnetic layer made of a Co or Co-based alloy, and an underlayer disposed between the substrate and the magnetic layer. The underlayer is made of an ordered intermetallic material of FCC L12 or FCT L10 crystalline structure, so that c-axis of the magnetic layer is aligned in a predetermined direction.

Abstract: A magnetic recording medium includes at least one magnetic layer, a ferromagnetic layer, a nonmagnetic coupling layer provided between the magnetic layer and the ferromagnetic layer, and a coupling intensifying region which intensifies an exchange coupling strength between the magnetic layer and the ferromagnetic layer. The coupling intensifying region is provided at, at least one of a boundary between the ferromagnetic layer and the nonmagnetic coupling layer and a boundary between the nonmagnetic coupling layer and the magnetic layer.

Abstract: A magnetic recording medium is constructed to include a substrate, a magnetic layer made of a Co or Co-based alloy, and an underlayer disposed between the substrate and the magnetic layer. The underlayer is made of an ordered intermetallic material of FCC L12 or FCT L10 crystalline structure.

Abstract: A magnetic recording medium provided with a substrate and a magnetic layer disposed above the substrate, is characterized by the magnetic layer which includes an initial layer located closer to the substrate and a final layer located further away from the substrate than the initial layer. A saturation magnetization MSa of the initial layer, a saturation magnetization MSb of the final layer, and a saturation magnetization MStot of the magnetic layer as a whole satisfies a relationship MSa<MStot<MSb or MSa>MStot>MSb.

Abstract: A magnetic recording medium is provided with at least one exchange layer structure, and a magnetic layer formed on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer, and a non-magnetic coupling layer provided on the ferromagnetic layer and under the magnetic layer. The ferromagnetic layer and the magnetic layer have antiparallel magnetizations.

Abstract: A magnetic recording medium is provided with at least one exchange layer structure, and a magnetic layer formed on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer, and a non-magnetic coupling layer provided on the ferromagnetic layer and under the magnetic layer. The ferromagnetic layer and the magnetic layer have antiparallel magnetizations.

Abstract: A magnetic recording medium includes a non-magnetic substrate having a top surface subjected to a texturing process in one direction, a seed layer provided on the top surface of the substrate and made of Cr or a Cr-based alloy having a (002) crystal face which is approximately parallel to the top surface of the substrate, an underlayer, provided on the seed layer and having a B2 crystal structure, and a magnetic layer provided above the underlayer, and made of a Co-based alloy.