Magnetic Properties and Kinetics Parameters of Electroless Magnetic Loss CoFeB Films

摘要

Electroless CoFeB films with good soft magnetic properties were fabricated on polyester plastic substrate from sodium tartarate as a 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 -b_3 confidence interval,residual error r and confidence interval r_(int)were confirmed by a 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 mu',mu" of the electroless CoFeB films were 304 and 76.6,respectively,as the concentration of reducer is 1 g/L.Magnetic hysteresis loop of the deposited CoFeB films show a remanence close to the saturation magnetization and coercivity of about 55.7 - 127.4 A/m.The loops along the hard axis display low anisotropic field H_k of 2 388 - 3 582 A/m.