Abstract: 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 85?h?140, and a ratio d of a permanent strain to an elastic recovery (permanent strain/elastic recovery) is 0.95?d?1.25.

Abstract: A method for producing a magnetic powder includes performing a reduction treatment on the surface of particles including a hard magnetic material to form core-shell particles each having a shell portion including a soft magnetic material.

Abstract: The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ?-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.

Abstract: A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ?-Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.

Abstract: A magnetic recording medium includes a nonmagnetic substrate, a nonmagnetic underlayer containing at least inorganic particles and a binder resin, and a magnetic layer containing at least a magnetic powder, a binder resin, and abrasive particles, the nonmagnetic underlayer and the magnetic layer being disposed in that order on at least one principal surface of the nonmagnetic substrate. The magnetic layer is formed after a coating material for forming the nonmagnetic underlayer is applied and subjected to drying treatment. The thickness Z of the magnetic layer is 100 nm or less, the average particle diameter Da (nm) of the abrasive particles and the thickness Z (nm) of the magnetic layer satisfy the relationship 1.0?Da/Z?1.5, and the maximum particle diameter Dm (nm) and the thickness Z (nm) of the magnetic layer satisfy the relationship Dm/Z?1.8.

Abstract: A magnetic recording medium includes a non-magnetic supporter; a lower non-magnetic layer containing at least inorganic particles and a binder resin; and a magnetic layer containing at least a magnetic powder and a binder resin and having a thickness of 100 nm or less, the lower non-magnetic layer and the magnetic layer being laminated on a main surface of the non-magnetic supporter, wherein the magnetic layer is formed by a process including applying a paint for forming the lower non-magnetic layer; drying the applied paint; and applying a magnetic paint while the lower non-magnetic layer is kept in a film state after drying.