In this study, a dual-mode Metglas/Pb(Zr,Ti)O₃ magnetoelectric (ME) sensor was prepared for measuring weak magnetic fields. It is interesting to note that this ME sensor can work at alternating current (AC) and direct current (DC) dual-modes with high field resolution. In AC mode, a very accurate AC magnetic field resolution of 0.8 nT was achieved at a mechanical resonance frequency of 72.2 kHz; moreover, the operating frequency band for resolution better than 1 nT is as wide as 3.4 kHz. We proposed a DC bias field perturbation (DBFP) method to detect the DC magnetic field using lock-in amplifier technology. As a result, an ultra-accurate DC field resolution of 0.9 nT with noise power spectral density as low as 100 $\mathrm{p}\mathrm{T}/\sqrt{\mathrm{H}\mathrm{z}}$ was obtained in the studied ME sensor via the DBFP method. The dual-mode ME sensor enables simultaneous measurement for DC and AC magnetic fields with wideband and accurate field resolution, which greatly enhances the measurement flexibility and application scope.

中文翻译：

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具有高磁场分辨率和宽工作带宽的AC / DC双模磁电传感器

在这项研究中，双模Metglas / Pb（Zr，Ti）O ₃磁电（ME）传感器准备用于测量弱磁场。有趣的是，该ME传感器可以在具有高场分辨率的交流（AC）和直流（DC）双模下工作。在交流模式下，在72.2 kHz的机械共振频率下，交流磁场分辨率非常精确，为0.8 nT。此外，分辨率优于1 nT的工作频带高达3.4 kHz。我们提出了使用锁相放大器技术检测直流磁场的直流偏置磁场扰动（DBFP）方法。结果是0.9 nT的超高精度DC场分辨率和低至100的噪声功率谱密度$\mathrm{p}\mathrm{Ť}/\sqrt{\mathrm{H}\mathrm{ž}}$通过DBFP方法在所研究的ME传感器中获得了γ。双模ME传感器可实现宽带和精确的场分辨率同时测量DC和AC磁场，从而大大提高了测量的灵活性和应用范围。