MAGNETIC TAPE AND MAGNETIC TAPE CARTIDGE

摘要

A magnetic tape having an undercoat layer and a magnetic layer on one face of a nonmagnetic support and a backcoat layer on the other face comprises an acicular iron-based magnetic powder as a magnetic powder to be added to the magnetic layer. The thickness of the magnetic layer is 0.09mum or less. As the nonmagnetic powder to be added to the undercoat layer, platelike nonmagnetic oxide particles with a mean grain size of 10-100nm are used. The temperature expansion coefficient of the magnetic layer in the tape width direction is (0-8)x10<-6>/°C, and the humidity expansion coefficient is (0-10)x10<-6>/%RH. The edge weave present along one tape edge serving as the transport reference side during tape transport or along the opposite tape edge is 0.8mum or less. This magnetic tape is excellent in recording reproducing characteristics of short wavelength and hardly decreases in reproduction output becouse of offtrack.