Enhanced non-bias-field magnetoelectric response with high detectivity in a sensing system based on electret film and magnetostrictive material

An electret film and a magnetostrictive rod were used to combine a magnetoelectric sensing system. The dynamic magnetoelectric measurement was used to investigate the voltage output of the combined system. A significant non-bias-field magnetoelectric response was observed. The capacitance and magnetoelectric voltage coefficient were significantly affected by the AC and DC magnetic field. The ME voltage coefficient exhibited a step decrease with an increase in the DC field. The maximum tunability of the magnetoelectric voltage coefficient was 99.8%. The limit of detection of the AC magnetic field decreased rapidly with a very high value at lower frequencies and decreased slowly with a very low value at higher frequencies. The minimum value of the limit of detection was approximately 0.016 Oe. These findings indicated the combination for potential applications in magnetic de-tectors, magnetoelectric sensors, switches, and energy converters.

Automated summary

An electret film and a magnetostrictive rod were combined to create a magnetoelectric sensing system. Dynamic magnetoelectric measurement was used to study the voltage output of the system, showing a significant non-bias-field magnetoelectric response. Both the capacitance and magnetoelectric voltage coefficient were affected by the AC and DC magnetic field. The ME voltage coefficient exhibited a step decrease with an increase in the DC field, with a maximum tunability of 99.8%.