A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 m or less, and in an environment with a temperature of 32 C. and a relative humidity of 80%, a frictional force F.sub.45 on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45 is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0, 15, 30, and 45 is 10 gf or less.

A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 ?m or less, and in an environment with a temperature of 32? C. and a relative humidity of 80%, a frictional force F.sub.45? on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45? is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0?, 15?, 30?, and 45? is 10 gf or less.

A magnetic tape in which a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and in an environment with a temperature of 32? C. and a relative humidity of 80%, a frictional force F.sub.45? on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45? is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0?, 15?, 30?, and 45? is 10 gf or less.

This disclosure relates to a memory device that includes at least one magnetic track on a substrate, wherein the at least one magnetic track comprises one or more magnetic domains. Contacts can be disposed on the at least one magnetic track according to a predetermined arrangement to form a plurality of bitcells on the at least one magnetic track, wherein each one of the plurality of bitcells is configured to store at least one magnetic domain. The device can include a timing circuit connected to the contacts, with the timing circuit being configured to apply to the contacts multiple phases of electric currents according to a predetermined timing sequence to cause the at least one magnetic domain to shift from the each one of the plurality of bitcells to an adjacent one of the plurality of bitcells on the at least one magnetic track.

Provided is a magnetic recording medium including: a support body; a base layer containing carbon particle powder and metal-containing particle powder; and a recording layer. In a recording surface, a maximum indentation depth h is 85h140, and a ratio d of a permanent strain to an elastic recovery (permanent strain/elastic recovery) is 0.95d1.25.

Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a quantity of components selected from the group consisting of a fatty acid and a fatty acid amide per unit area of the magnetic tape among components that are extracted from a surface on the magnetic layer side of the magnetic tape is less than or equal to 15.0 mg/m.sup.2, and a concentration of carbon, C, that is obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface on the magnetic layer side of the magnetic tape is greater than or equal to 50 atom %.

Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein a total thickness of the magnetic tape is less than or equal to 4.80 m; at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; and a CH derived carbon, C, concentration calculated from a CH peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape is greater than or equal to 45 atom %.

The carbon black composition for manufacturing a particulate magnetic recording medium contains carbon black, vinyl chloride resin containing one or more epoxy groups, the secondary monoamine denoted by formula 1, and solvent,

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wherein, in formula 1, each of R.sup.1 and R.sup.2 independently denotes an alkyl group branching off at a carbon atom, the carbon atom being present at an -position relative to an amine nitrogen atom, and having a main structure with 7 or fewer carbon atoms, it being possible for the alkyl group denoted by R.sup.1 to be in the form of a cyclic structure, possible for the alkyl group denoted by R.sup.2 to be in the form of a cyclic structure, and possible for the alkyl group denoted by R.sup.1 and the alkyl group denoted by R.sup.2 be connected to form a cyclic structure, with neither R.sup.1 nor R.sup.2 containing a hydroxyl group.

A magnetic tape in which a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and in an environment with a temperature of 32 C. and a relative humidity of 80%, a frictional force F.sub.45 on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45 is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0, 15, 30, and 45 is 10 gf or less.

A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 m or less, and in an environment with a temperature of 32 C. and a relative humidity of 80%, a frictional force F.sub.45 on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45 is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0, 15, 30, and 45 is 10 gf or less.