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: There is provided a magnetic recording medium which has a layer structure including a magnetic layer and a base layer, and of which an average thickness tT is tT?5.6 ?m, a dimensional change amount ?w in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N??w, a servo pattern is recorded on the magnetic layer, a standard deviation ?PES of a position error signal (PES) value obtained from a servo signal in which the servo pattern is reproduced is ?PES?25 nm, and a maximum value ?1M of a friction coefficient ?1 between a surface on a side of the magnetic layer and an LTO3 head in a case where measurement of the friction coefficient ?1 is performed 250 times is 0.04??1M?0.5.

Abstract: There is provided a magnetic recording medium which has a layer structure including a magnetic layer and a base layer, and of which an average thickness tT is tT?5.6 ?m, a dimensional change amount ?w in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N??w, a servo pattern is recorded on the magnetic layer, a standard deviation ?PES of a position error signal (PES) value obtained from a servo signal in which the servo pattern is reproduced is ?PES?25 nm, and a maximum value ?1M of a friction coefficient ?1 between a surface on a side of the magnetic layer and an LTO3 head in a case where measurement of the friction coefficient ?1 is performed 250 times is 0.04??1M?0.5.

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 an elongated substrate, and a reinforcing layer and a carbon thin film disposed on one surface of the substrate.

Abstract: A magnetic recording medium includes a layer structure including a magnetic layer, a non-magnetic layer, and a base layer in this order, in which an average thickness tT is tT?5.5 ?m, a dimensional variation ?w in a width direction to tension change in a longitudinal direction is 660 ppm/N??w, and an average thickness tn of the non-magnetic layer is tn?1.0 ?m.

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: 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: A tape-shaped magnetic recording medium includes a substrate; and a magnetic layer that is provided on the substrate and contains a magnetic powder. An average thickness of the magnetic layer is not more than 90 nm, an average aspect ratio of the magnetic powder is not less than 1.0 and not more than 3.0, the coercive force Hc1 in a vertical direction is not more than 3000 Oe, the coercive force Hc1 in the vertical direction and a coercive force Hc2 in a longitudinal direction satisfy a relationship of Hc2/Hc1?0.8, and a value of ?1.5??0.5 is not more than 0.6 N in a tensile test of the magnetic recording medium in the longitudinal direction, where ?0.5 is a load at an elongation rate of 0.5% in the magnetic recording medium and ?1.5 is a load at an elongation rate of 1.5% in the magnetic recording medium.

Abstract: A tape-shaped magnetic recording medium includes a substrate; and a magnetic layer that is provided on the substrate and contains a magnetic powder. An average thickness of the magnetic layer is not more than 90 nm, an average aspect ratio of the magnetic powder is not less than 1.0 and not more than 3.0, the coercive force Hc1 in a vertical direction is not more than 3000 Oe, the coercive force Hc1 in the vertical direction and a coercive force Hc2 in a longitudinal direction satisfy a relationship of Hc2/Hc1?0.8, and a value of ?1.5-?0.5 is not more than 0.6 N in a tensile test of the magnetic recording medium in the longitudinal direction, where ?0.5 is a load at an elongation rate of 0.5% in the magnetic recording medium and ?1.5 is a load at an elongation rate of 1.5% in the magnetic recording medium.

Abstract: Provided is a magnetic recording medium having a recording track width of 2 ?m or less, including: a recording layer containing a powder of particles containing ? iron oxide, in which a squareness ratio measured in a transport direction is 30% or less, a squareness ratio S1 measured in the transport direction and a squareness ratio S2 measured in a width direction satisfy a relationship S1?S2, a coercive force is 220 kA/m or greater and 310 kA/m or less, an activation volume is 8000 nm3 or less, and in a switching field distribution (SFD) curve, a peak ratio X/Y of a main peak height X and a height Y of a sub-peak near zero magnetic field is 3.0 or greater.

Abstract: Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ? iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.

Abstract: A magnetic recording medium, which is used in a recording and playback device in which the shortest recording wavelength is 75 nm or less, in which the magnetic recording medium has a recording layer including powder of ?-iron oxide-containing particles, the average particle size of the particles is 22 nm or less, the coercive force He is 220 kA/m or more and 320 kA/m or less, and the non linear transition shift is 20% or less.

Abstract: A magnetic recording medium is used in a recording/reproduction apparatus having a shortest recording wavelength of not more than 75 nm, the magnetic recording medium including a recording layer that contains a powder of particles containing ?-iron oxide, in which a squareness ratio measured in a traveling direction of the magnetic recording medium is not more than 30%, a ratio (Dmax/Dmin) of an average longest diameter Dmax of the particles to an average shortest diameter Dmin of the particles satisfies a relationship of 1.0?(Dmax/Dmin)?1.1, an average thickness ?mag of the recording layer is not more than 100 nm, and a ratio (?mag/Dmin) of the average thickness ?mag of the recording layer to the average shortest diameter Dmin of the particles satisfies a relationship of ?mag/Dmin?5.

Abstract: A method of producing a magnetic powder includes performing heat treatment on first particles that contain ferrous oxide to prepare second particles that contain ?-iron oxide.

Abstract: A magnetic recording medium according to a first technique includes an elongated substrate having a first surface and a second surface, a first reinforcing layer disposed on the first surface, a second reinforcing layer disposed on the second surface, an adhesion suppressing layer disposed on the second reinforcing layer, and a recording layer disposed on the first reinforcing layer or the adhesion suppressing layer.

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: 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: The magnetic recording medium includes a long substrate body, and a magnetic layer including a powder of cubic crystal ferrite magnetic particles. The sum of a squareness ratio in the longitudinal direction and a squareness ratio in the vertical direction is 1.2 or more, and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.15 or more.

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.