Abstract
To obtain amorphous FeB-plated films with soft magnetization, the effect of a combined complex agent of potassium sodium tartrate (KNaC4H4O6 · 4H2O) and ammonium sulfate ( (NH4)2SO4) on the film properties was investigated. Soft magnetic films with coercivities of less than 4 Oe were obtained by using a bath composition of KNaC4H4O6 · 4H2O = 600mmol/L and (NH4)2SO4 = 80mmol/L. These soft films also exhibited large magnetostriction of 26 × 10-6, suggesting that the use of the combined complex agent is very effective for obtaining FeB amorphous films that have soft magnetic properties and large magnetostriction simultaneously. Change in composition of films along their thicknesses is considered to be responsible for the magnetic softening of FeB-plated films.
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