Distribution profile of magnetization in ME tape

Using partial erasure measurements, the depth up to which the head field is able to switch the magnetization in conventional particulate tapes can be determined. For metal evaporated tape, this experiment shows that the magnetization is not uniform throughout the magnetic layer. For a single layered metal evaporated tape with a total thickness of 200 nm, a layer with a thickness of about 55 nm near the top surface is estimated to have a magnetization 50% higher than the mean value