Electrochemical Deposition Of Fe-b Magnetostrictive Material

Based on the application of acoustic wave sensor, Fe-B magnetostrictive thin films withthe molar ratio close to80/20were fabricated by electrochemical deposition. By studying theeffects of current density, deposition temperature and solution contents on the structure,morphology, magnetostrictive effect and magnetic property of the thin films, it was concludedthat the parameters to get close to amorphous, soft magnetic and magnetostrictive Fe-B thinfilm were: fabricating Fe-B thin films at the current density of4mA/cm²with90g/LKNaC4H₄O₆·4H₂O,20g/L FeSO4·7H₂O,10.0g/L NaOH and16.0g/L KBH4at roomtemperature. The main results were listed as follows:1. The Fe-B thin films fabricated under the current density of3mA/cm²,4mA/cm²and5mA/cm²had amorphous structure containing nano crystals. The resonance frequency of thethin films decreased with increasing length of the samples. Under the same current density.The samples fabricated with4mA/cm²exhibited the highest Q value. The samples preparedunder3mA/cm²had the lowest coercive force.2. Among the temperatures of11℃,24℃and40℃, Fe-B thin films fabricated under4mA/cm²for7hr tended to form crystalline structure with increasing the depositiontemperature. The saturated magnetization of Fe-B thin films decreased firstly and thenincreased with increasing the deposition temperature. The remanent magnetization,squareness and coercive force all increased with increasing the deposition temperature.3. Among the concentration16.0g/L,12.8g/L and10.0g/L of NaOH without changingother components, the deposition rate of Fe-B thin films increased with increasing theconcentration of NaOH. The amorphous formability decreased with increasing theconcentration of NaOH. The saturated magnetization of Fe-B thin films decreased firstly andthen increased with increasing the concentration of NaOH, while the squareness and coerciveforce both increased with increasing the concentration of NaOH. Without changing othercontents, the amorphous formability of Fe-B thin films increased with increasing theconcentration of KNaC4H₄O₆4H₂O. The saturated magnetization, remanent magnetizationand coercive force all decreased with increasing the concentration of KNaC4H₄O₆4H₂O, while the squareness increased with increasing the concentration of KNaC4H₄O₆4H₂O.Without changing other components, the amorphous formability of Fe-B thin films increasedwith increasing the concentration of KBH4.4. The length of Fe-B nanobars fabricated under5mA/cm²increased with increasing thedeposition time. The average wall thickness and average length of the Fe-B nanotubesfabricated under5mA/cm²increased with increasing deposition time.