Abstract: A tape-type magnetic recording medium, includes a substrate; and a magnetic layer provided on the substrate. The magnetic recording medium is configured such that (1) (wmax?wmin)/wmin?400 [ppm] where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, and the magnetic layer has a squareness ratio of 65% or more in the vertical direction, and (2) 4.4?TB/(TA?TB) where TA is an average thickness of the magnetic recording medium and TB is an average thickness of the substrate.

Abstract: There is provided a magnetic recording medium of which an average thickness tT is tT?5.6 ?, 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 squareness ratio in a vertical direction is 65% or more, and a width deformation coefficient b during long-term storage in a case where a long-term storage width change amount Y is defined as Y=blog(t) is ?0.06 ?m?b?0.06 ?.

Abstract: A magnetic recording medium is provided and includes a magnetic layer, a non-magnetic layer, a base layer and a back layer, wherein an average thickness tT of the magnetic recording medium is tT?5.3 ?m, a dimensional change amount ?w in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/N??w, a thickness of the non-magnetic layer is 2.0 ?m or less, a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more, and the magnetic layer includes a magnetic powder.

Abstract: A magnetic recording cartridge includes a magnetic recording medium of which an average thickness tT is tT?5.6 ?m, a dimensional change amount ?w in a width direction with respect to a tension change in a longitudinal direction is 660 ppm/N??w, and a squareness ratio in a vertical direction is 65% or more, in which the magnetic recording medium is accommodated in a state of being wound around a reel and (a servo track width on an inner side of winding of the magnetic recording medium)?(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied.

Abstract: A magnetic recording cartridge is provided and including a magnetic recording medium, wherein an average thickness of the magnetic recording medium tT is 3.5 ?m?tT ?5.6 ?m, a dimensional change amount ?w in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N??w ?20000 ppm, the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and (a servo track width on an inner side of winding of the magnetic recording medium)-(a servo track width on an outer side of winding of the magnetic recording medium) > is satisfied, and a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more.

Abstract: A magnetic recording cartridge includes a magnetic recording medium of which an average thickness tT is tT?5.6 ?m, a dimensional change amount ?w in a width direction with respect to a tension change in a longitudinal direction is 660 ppm/N??w, and a squareness ratio in a vertical direction is 65% or more, in which the magnetic recording medium is accommodated in a state of being wound around a reel and (a servo track width on an inner side of winding of the magnetic recording medium)?(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied.

Abstract: A magnetic recording medium includes a layer structure including a magnetic layer, a base layer, and a back 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 a surface roughness Rabe of the base layer on a side of the back layer is 4.2 nm?Rabe?8.5 nm.

Abstract: In a magnetic recording medium, 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 650 ppm/N??w, and a rate of shrinkage in the longitudinal direction is 0.08% or less.

Abstract: A magnetic recording cartridge is provided and including a magnetic recording medium, wherein an average thickness of the magnetic recording medium tT is 3.5 ?m?tT?5.6 ?m, a dimensional change amount ?w in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N??w?20000 ppm, and the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and (a servo track width on an inner side of winding of the magnetic recording medium)?(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied.

Abstract: A tape-type magnetic recording medium, includes a substrate; and a magnetic layer provided on the substrate. In a case where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, wmax and wmin satisfy a relation of (wmax?wmin)/wmin?400 [ppm]. The substrate contains polyester, and the magnetic layer has a squareness ratio of 65% or more in the vertical direction.

Abstract: A magnetic recording medium includes: a flexible and elongated substrate; a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less; and a recording layer, in which the soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.

Abstract: A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 ?m) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.

Abstract: The average thickness tT of a magnetic recording medium meets the requirement that tT ?5.5 [?m], and the dimensional change amount ?w in the width direction of the magnetic recording medium with respect to the tension change in the longitudinal direction of the magnetic recording medium meets the requirement that 700 ppm/N??w.

Abstract: A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·??1.5(1?Rs)0.33), Ms, and ? satisfy (Ms·?·?1.5(1?Rs)0.33)?0.1 [?·emu·(mm)?1.5], Ms?450 [emu/cc], and ??1.2. In the above formulas, Ms indicates a saturated magnetization amount, ? indicates the gradient of a M-H loop around a coercive force Hc, ? indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.

Abstract: A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 ?m or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 ?m) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.

Abstract: A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·??1.5(1?Rs)0.33), Ms, and ? satisfy (Ms·?·?1.5(1?Rs)0.33)?0.1 [?·emu·(mm)?1.5], Ms?450 [emu/cc], and ??1.2. In the above formulas, Ms indicates a saturated magnetization amount, ? indicates the gradient of a M-H loop around a coercive force Hc, ? indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.

Abstract: There is provided a magnetic recording medium including a surface having a longitudinal direction and a lateral direction. An arithmetic average roughness Ra, a ratio PSDMD,short/PSDTD,short, and a ratio PSDMD,long/PSDTD,long on the surface satisfy Ra?3.0 nm, PSDMD,short/PSDTD,short?0.65, and 1.3?PSDMD,long/PSDTD,long?2.3, in which PSDMD,short is an average value of PSD values in a range from 0.15 ?m to 0.4 ?m in the longitudinal direction of the surface, PSDTD,short is an average value of PSD values in a range from 0.15 ?m to 0.4 ?m in the lateral direction of the surface, PSDMD,long is an average value of PSD values in a range from 0.4 ?m to 5.0 ?m in the longitudinal direction of the surface, and PSDTD,long is an average value of PSD values in a range from 0.4 ?m to 5.0 ?m in the lateral direction of the surface.

Abstract: A magnetic recording medium includes a base material which has flexibility, a lower coating layer, and a recording layer, in which, in X-ray diffraction peaks, a value of ??50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured by a locking curve method is 5° or more to less than 10°.

Abstract: A magnetic recording medium includes a base material which has flexibility, a lower coating layer, and a recording layer, in which, in X-ray diffraction peaks, a value of ??50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured by a locking curve method is 5° or more to less than 10°.

Abstract: There is provided a magnetic recording medium including a surface having a longitudinal direction and a lateral direction. An arithmetic average roughness Ra, a ratio PSDMD,short/PSDTD,short, and a ratio PSDMD,long/PSDTD,long on the surface satisfy Ra?3.0 nm, PSDMD,short/PSDTD,short?0.65, and 1.3?PSDMD,long/PSDTD,long?2.3, in which PSDMD,short is an average value of PSD values in a range from 0.15 ?m to 0.4 ?m in the longitudinal direction of the surface, PSDTD,short is an average value of PSD values in a range from 0.15 ?m to 0.4 ?m in the lateral direction of the surface, PSDMD,long is an average value of PSD values in a range from 0.4 ?m to 5.0 ?m in the longitudinal direction of the surface, and PSDTD,long is an average value of PSD values in a range from 0.4 ?m to 5.0 ?m in the lateral direction of the surface.