Sendust material can now be produced in ribbon form which possesses all of the properties necessary for ideal tape heads for recording and playback: 1) High malleability, permitting easy machining, 2) High initial permability-over 32,000-permitting high sensitivity for playback heads, 3) Low coercivity-less than 1.6 A/m-permitting heads with low modulation noise, 4) High saturation flux density-over 900 mT-permitting easy recording on high-coercivity metal tapes, 5) Thickness as small as 20 µm, permitting high-frequency performance to over 20 kHz, comparable to the best ferrites, 6) High wear-resistance, less than 2 µm per 1000 h: Some details of the manufacturing process are discussed along with the measured head performance data.
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