POLARIZED NEUTRON REFLECTOMETRY ON METAL EVAPORATED VIDEOTAPES

An 11 mm wide recorder head was used to simulate the writing process o n one- and two-layer Hi8 metal evaporated videotapes. Polarized neutro n reflectometry was used to study the in-plane magnetization as a func tion of depth after the writing process. Data for different magnetic s tates were fitted simultaneously, with the same nuclear structure. Tot al in-plane magnetization from the fits agrees with VSM-results. The f itted models show that the recorder head writes throughout the whole d epth in both tapes. The in-plane magnetization in the two-layer tape e xhibits two maxima; it is oppositely directed in the two layers in rem anence after perpendicular magnetization. These results show that pola rized neutron reflectometry is a suitable technique to study the writi ng-mechanism on metal evaporated videotapes.