Magnetic recording medium including magnetic layer having magnetic powder, magnetic recording/reproducing device, and magnetic recording medium cartridge

A magnetic recording/reproducing device comprising:

• a magnetic recording medium;
• a feeding unit that can sequentially feed out the magnetic recording medium;
• a winding unit that can wind up the magnetic recording medium fed out from the feeding unit;
• and
• a magnetic head that can write information on the magnetic recording medium and can read out information from the magnetic recording medium while being in contact with the magnetic recording medium traveling from the feeding unit toward the winding unit, wherein
• the magnetic recording medium includes:
• a substrate containing a polyester as a main component;
• and
• a magnetic layer disposed on the substrate, including a plurality of types of magnetic powder, and capable of recording a data signal in which a half-value width of an isolated waveform in a reproduced waveform of the data signal is 200 nm or less,
• a surface of the magnetic layer has an arithmetic average roughness Ra of 2.5 nm or less,
• a power spectrum density (PSD) up to a spatial wavelength of 5 μm is 2.5 μm or less,
• the magnetic layer has an average thickness of 90 nm or less,
• the plurality of types of magnetic powder have an average aspect ratio of 1.0 or more and 3.0 or less,
• a coercive force in a perpendicular direction is 3000 oersted or less, and
• a ratio of a coercive force in a longitudinal direction to the coercive force in the perpendicular direction is 0.8 or less,
• wherein the magnetic recording medium is tape-shaped.

A magnetic recording medium cartridge comprising:

• a magnetic recording medium;
• and
• a casing that houses the magnetic recording medium, wherein
• the magnetic recording medium includes:
• a substrate containing a polyester as a main component;
• and
• a magnetic layer disposed on the substrate, including a plurality of types of magnetic powder, and capable of recording a data signal in which a half-value width of an isolated waveform in a reproduced waveform of the data signal is 200 nm or less,
• a surface of the magnetic layer has an arithmetic average roughness Ra of 2.5 nm or less,
• a power spectrum density (PSD) up to a spatial wavelength of 5 μm is 2.5 μm or less,
• the magnetic layer has an average thickness of 90 nm or less,
• the plurality of types of magnetic powder have an average aspect ratio of 1.0 or more and 3.0 or less,
• a coercive force in a perpendicular direction is 3000 oersted or less, and
• a ratio of a coercive force in a longitudinal direction to the coercive force in the perpendicular direction is 0.8 or less,
• wherein the magnetic recording medium is tape-shaped.