An ultra-sensitive magnetic field detector is demonstrated in a bilayer magnetoelectric (ME) composite structure employing a flash photon annealing (FPA) treated amorphous Metglas (FeBSi) alloy and piezoelectric single crystal macro fiber composites (SFC). A millisecond FPA annealing approach altered the magnetostrictive and mechanical properties of Metglas by annealing at a high temperature without inducing severe embrittlement. The ME composite (MEC) fabricated with FPA-treated Metglas (FPA-MEC) exhibited an enhanced ME coupling coefficient (at a resonance condition ~47% and at an off-resonance condition ~52%) relative to that of untreated Metglas based ME composite (pristine MEC), owing to the improved magnetic flux concentration/piezo-magnetic coefficient and reduced resonance loss in Metglas. This led to the realization of an ultra-sensitive magnetic field sensor with a direct detection limit of 0.5 pT [1 order improved performance compared to the pristine MEC (sensing limit of 5 pT)] at an extremely low resonance frequency condition (< 100 Hz). The obtained results demonstrate a feasible way to design magnetic sensors for detecting bio-magnetic and extremely low-frequency (ELF) magnetic fields under ambient conditions.

在采用闪光光子退火 (FPA) 处理的非晶 Metglas (FeBSi) 合金和压电单晶宏纤维复合材料 (SFC) 的双层磁电 (ME) 复合结构中展示了超灵敏磁场探测器。毫秒 FPA 退火方法通过在高温下退火而不引起严重脆化改变了 Metglas 的磁致伸缩和机械性能。与未处理的基于 Metglas 的 ME 相比，用 FPA 处理的 Metglas (FPA-MEC) 制造的 ME 复合材料 (MEC) 表现出增强的 ME 耦合系数（在共振条件下~47% 和在非共振条件下~52%）复合材料（原始 MEC），由于改进的磁通量集中/压电系数和降低的 Metglas 共振损耗。 100 赫兹）。获得的结果证明了一种设计磁传感器的可行方法，用于在环境条件下检测生物磁和极低频 (ELF) 磁场。