TRANSVERSE SUSCEPTIBILITY AND FERROMAGNETIC-RESONANCE OF HI-8 METAL-EVAPORATED TAPE

Transverse susceptibility (TS) and ferromagnetic resonance absorption (FMR) are measured on commercially available metal-evaporated video ta pe manufactured by the continuous varying incidence method, so that th e columns are inclined at an angle upsilon(int) with respect to the re cording direction. Due to the demagnetization of the tape the magnetiz ation vector is at an extrinsic inclination angle upsilon(ext) < upsil on(int) with respect to the recording direction, which is determined t o be 24-degrees by analyzing angular remanence curves. The results of TS and FMR measurements on the dependence of the angle upsilon(N) betw een applied field and tape normal are symmetrical to upsilon(N) = upsi lon(ext). In-plane TS measurements parallel and perpendicular to the r ecording direction lead to H(A) = 440 kA/m and an intrinsic inclinatio n angle upsilon(int) = 44-degrees. Using these values, measured and ca lculated resonance field values H(res) are in good agreement except fo r 0-degrees < upsilon(N) < 50-degrees. The analysis of H(res) in the v icinity of upsilon(N) = 24-degrees leads to H(A) = 640 kA/m and upsilo n(int) = 37-degrees. Thus, Stoner-Wohlfarth behavior with lower anisot ropy field strength as determined perpendicular to the preferential ax is of magnetization is suggested. In contrast to TS measurements, no r esults can be found that fit the resonance field value both parallel a nd perpendicular to the film normal.