Correlation between anisotropy direction and pulse shape for metal evaporated tape

Abstract

Measured replay pulses, recorded on Metal Evaporated tape, show a strong asymmetry and dependence on the direction of tape movement. It is found that pulse height and pulse width are unequal for both directions of tape movement. This attributed to the non longitudinal easy-axis direction which causes differences in headtape geometry for both directions resulting in a different transition width. A simulation model is proposed. The difference in pulse asymmetry and pulse width between both directions of tape movement are very well reproduced by this model. From X-ray diffraction measurements and the results of simulations it is concluded that not the columns but the crystallites act as magnetic entities for this kind of tape