Experiments on the writing process in magnetic recording

To provide an understanding of the relative recording performance of different tapes the paper determines what takes place when the magnetic field from a writing head acts on the particles in the tape. Methods of measuring the following are described: (1) the shape, size, and position of the recorded transition between two oppositely-magnetized regions as a function of writing current; (2) the depth of recording; and (3) recording demagnetization as a function of density.