Abstract
Electroless CoFeB films with good soft magnetic properties were fabricated on poly-ester plastic substrate from sodium tartarate as complexing agent. The plating rate of electroless CoFeB films is a function of concentration of sodium tetrahydroborate, pH of the plating bath, plating temperature and the metallic ratio. The estimated regression coefficient b 0–3, confidence interval, residual error r and confidence interval r int were confirmed by computer program. The optimal composition of the plating bath was obtained and the dynamic electromagnetic parameters of films were measured in the 2–10 GHz range. At 2 GHz, the μ′, μ″ of the electroless CoFeB films are 304 and 76.6, respectively, as the concentration of reducer is 1 g L −1. Magnetic hysteresis loop of deposited CoFeB films shows a remanence close to the saturation magnetization and coercivity of about 0.7–1.6 Oe. The loops along the hard axis display low anisotropic field H k of 30–45 Oe.
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