Magnetic recording medium

摘要

A magnetic recording medium includes a flexible substrate (10), a coating layer (20) formed on the flexible substrate (10), and a magnetic layer(30) formed on the coating layer(20). The coating layer(20) contains a binder and nonmagnetic particles and has a thickness in the range of 0.05 to 0.7 mu m as a result of a stretching treatment performed at least once after application of the coating layer on the flexible substrate. The magnetic layer(30) contains magnetic powder, a binder and an abrasive and has a thickness in the range of 0.05 to 1.0 mu m. The nonmagnetic particles contained in the coating layer has an average particle size in the range of 0.01 to 0.08 mu m. The abrasive contained in the magnetic layer has an average particle size in the range of 0.05 to 0.8 mu m and satisfies conditions defined by the following equations (1) and (2): $$ $ wherein\; dmx\; represents\; a\; maximum\; particle\; size\; of\; the\; abrasive,\; dav\; represents\; an\; average\; particle\; size\; of\; the\; abrasive,\; tc\; represents\; a\; thickness\; of\; the\; coating\; layer,\; and\; tm\; represents\; a\; thickness\; of\; the\; magnetic\; layer.\; With\; this\; arrangement,\; the\; magnetic\; recording\; medium\; is\; excellent\; in\; productivity\; and\; further\; improves\; a\; surface\; property\; of\; the\; thin\; magnetic\; layer.\; This\; achieves\; high\; outputs\; at\; a\; region\; of\; shorter\; wavelength\; and\; further\; achieves\; excellent\; running\; durability.$$$