Abstract: An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising preparing a melt by melting a starting material mixture comprising a hexagonal ferrite-forming component and a glass-forming component; rapidly cooling the melt to obtain an amorphous material comprising 0.3 to 2.0 weight percent of carbon atoms; heating the amorphous material to a temperature range of 580 to 700° C. and maintaining the amorphous material within the temperature range to precipitate hexagonal ferrite magnetic particles; and collecting the hexagonal ferrite magnetic particles precipitated.

Abstract: An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising preparing a melt by melting a starting material mixture comprising a hexagonal ferrite-forming component and a glass-forming component; rapidly cooling the melt to obtain an amorphous material comprising 0.3 to 2.0 weight percent of carbon atoms; heating the amorphous material to a temperature range of 580 to 700° C. and maintaining the amorphous material within the temperature range to precipitate hexagonal ferrite magnetic particles; and collecting the hexagonal ferrite magnetic particles precipitated.

Abstract: An aspect of the present invention relates to a magnetic head employed in a linear tape drive in the form of a sliding-contact linear tape drive. The magnetic head comprises multiple indentations that are observed in a surface topographic image viewed by a scanning probe microscope on a surface (sliding contact surface) of sliding contact with a magnetic tape, and the multiple indentations satisfy (1) to (4) below: (1) an average area of the indentations in the sliding contact surface ranges from about 0.2 ?m2 to about 1.0 ?m2; (2) a standard deviation of an area of the indentations ranges from about 0.5 ?m2 to about 2.0 ?m2; (3) an area ratio of the indentations in the sliding contact surface ranges from about 20 percent to about 50 percent; and (4) an average depth of the indentations is equal to or greater than about 15 nm.

Abstract: The present invention provides a magnetic transfer master disk comprising: a master substrate formed by a metal plate, on a surface of which a protruding and recessed pattern corresponding to transfer information is transferred by electroforming, the metal plate being composed of two or more electroforming layers that are different from each other in crystal orientation; and a magnetic layer formed on the protruding and recessed pattern of the master substrate in order to eliminate warpage and distortion of the master disk even if the close contact pressure is increased during transferring magnetic information such as format information to a magnetic disk used in a hard disk device and the like.

Abstract: The present invention provides a master disk with high flexibility and high close contact property with a slave disk to be transferred, which bears information to be transferred by magnetic transfer. When incident angle of X-ray is designated by ?, electroforming is performed such that X-ray diffraction pattern of the master substrate 11 has a 200 plane reflection at 2?=51.0° to 53.0°, and a 220 plane reflection at 2?=75.5° to 76.5°, and the reflection intensity ratio of X-ray diffraction of the 220 plane with respect to the 200 plane is I[220]/I[200]=2 to 30.

Abstract: Provided is an optical recording medium having a recording layer, an intermediate layer, an adhesive layer and a cover sheet in this order on a substrate, wherein the thickness t1 of the intermediate layer after a high-temperature high-humidity storage test satisfies the relationship: 0.8t?t1?1.2t wherein t is the thickness of the intermediate layer before the high-temperature high-humidity storage test.

Abstract: A magnetic recording medium includes a nonmagnetic support; and a magnetic layer that comprises a binder and ferromagnetic powder dispersed in the binder, wherein ? is 10 to 100 nm; and ?d is from 5 to 50 nm in terms of coating layer in the magnetic recording medium, wherein ? represents an average thickness of the magnetic layer; and ?d represents a standard deviation that is obtained by measuring by TOF-SIMS a depth profile of an element present only in the magnetic layer among elements constituting the ferromagnetic powder and subjecting a differential curve of the depth profile to a normal distribution curve fitting.

Abstract: A magnetic recording medium comprising: a support; an under layer comprising at least one of a metal and an alloy; and a granular magnetic layer comprising ferromagnetic metal particles and a nonmagnetic oxide, wherein the magnetic recording medium has a surface resistivity of from 1 to 100 ?/?.

Abstract: The present invention provides a master disk with high flexibility and high close contact property with a slave disk to be transferred, which bears information to be transferred by magnetic transfer. When incident angle of X-ray is designated by ?, electroforming is performed such that X-ray diffraction pattern of the master substrate 11 has a 200 plane reflection at 2?=51.0°to 53.0°, and a 220 plane reflection at 2?=75.5° to 76.5°, and the reflection intensity ratio of X-ray diffraction of the 220 plane with respect to the 200 plane is I[220]/I[200]=2 to 30.

Abstract: The present invention provides a magnetic transfer master disk comprising: a master substrate formed by a metal plate, on a surface of which a protruding and recessed pattern corresponding to transfer information is transferred by electroforming, the metal plate being composed of two or more electroforming layers that are different from each other in crystal orientation; and a magnetic layer formed on the protruding and recessed pattern of the master substrate in order to eliminate warpage and distortion of the master disk even if the close contact pressure is increased during transferring magnetic information such as format information to a magnetic disk used in a hard disk device and the like.

Abstract: A magnetic recording medium comprising, in this order, a nonmagnetic support, a lower layer containing nonmagnetic powder and a binder, and a magnetic layer containing ferromagnetic powder and a binder, wherein N/Fe of the magnetic layer measured with a fluorescent X-ray apparatus is from 0.5 to 1.9 wt %, and a number of concavities having a depth of 5 to 10 nm on a surface of the magnetic layer is from 20 to 100/100 ?m2.

Abstract: A magnetic recording medium comprising: a non-magnetic support; and a coating layer including a magnetic layer which contains a ferromagnetic powder containing a rare earth element and a binder and optionally a non-magnetic layer which contains a non-magnetic inorganic powder and a binder, wherein an amount of a liberated rare earth element in the coating layer is not more than 30 ppm.

Abstract: A magnetic recording medium comprising, in this order, a nonmagnetic support, a lower layer containing nonmagnetic powder and a binder, and a magnetic layer containing ferromagnetic powder and a binder, wherein N/Fe of the magnetic layer measured with a fluorescent X-ray apparatus is from 0.5 to 1.9 wt %, and a number of concavities having a depth of 5 to 10 nm on a surface of the magnetic layer is from 20 to 100/100 ?m2.