The application of sputtered thin film in advanced recording tape media

Recording characteristics of CoCrPt-sputtered tape media with a thickness of 25 nm were investigated using an anisotropic magnetoresistive head. The sputtered tape media showed a high output, and a flat frequency response with a D₅₀ value of 5500 fcmm (140 kfci) and a corresponding signal-to-noise ratio of 22 dB. Such sputtered tape media produced a sharp and symmetrical isolated pulse waveform with a PW₅₀ of 0.31 μm and showed good overwrite characteristics for digital recording. The overwrite performance of the sputtered tape media was better than 30 dB for an overwriting frequency of 12 MHz or 3500 fcmm (90 kfci) and overwritten frequency ranging from 2-9 MHz or 600-2650 fcmm (15-67 kfci). In addition, the stability of the sputtered tape media was characterized exposed to an atmosphere of 65°C and 90% RH for several weeks and showed to be highly corrosion resistive with less than 5% of their magnetization loss after 30 days of exposure.