EXPERIMENTAL-ANALYSIS OF THE EFFECTS OF TAPE THICKNESS ON MAGNETIC RECORDING

Advances in magnetic tape recording have produced media with magnetic layers as thin as 0.1 mu m. In this article, a metal particulate tape with a magnetic layer thickness of similar to 0.37 mu m is compared to a standard thick media tape with a magnetic layer thickness of simila r to 4 mu m. Measurements of the isolated pulse are made and shown to compare well with micromagnetic simulations. The replay voltage versus current is measured with a 4 mu m track width, shielded magnetoresist ive head at various densities. The thin tape shows better high density response at high currents than the thick tape. Thee simulations show that the transitions are sharper on the thin tape due to both the redu ction in thickness, and an improvement in the particle orientation. Th e better oriented particles yield narrower pulses, thereby improving t he high frequency response of the tape. Frequency response measurement s are also taken with the magnetoresistive head, which yield a signal to noise ratio of >20 dB at 200 kfci. Last, overwrite performance vers us current is compared for the two tapes plus a metal-evaporated (ME) tape with a 0.2 mu m thick layer. A significant improvement in overwri te is seen on the ME tape. (C) 1996 American Institute of Physics.