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In this work, we establish a magnetoelectric antenna system. The receiver is an in-plane series sensor composed of Mn-PMNT crystal fibers and Metglas. It has excellent magnetic field detection ability, reaching 3.1 pT/Hz1/2 under 1 Hz. We fabricated an asymmetric ME antenna based on PZT-5 H and Metglas at the transmitting end. The transmitter has two resonance peaks at a very low frequency (VLF), and its radiation ability can reach 73 nT at 14 kHz and 6.3 nT at 5.63 kHz. Furthermore, a nonlinear magnetostrictive model is constructed, and the ME effects are discussed through finite element mode. This model indicates that the near-field radiation capability of the device is strongly influenced by the frequency and magnetic bias, with the maximum performance achieved when the ME composite operates at the resonant frequency and the optimal piezomagnetic coefficient. [Display omitted] • The nonlinear near-field acoustic excitation antenna model can predict the resonant frequency of ME composites. • The PZT/Metglas magnetoelectric antenna fabricated in this work has two resonant frequencies in the very low-frequency band. The transmission capacity reaches 73 nT at 14 kHz and 6.3 nT at 5.63 kHz. Under limited external environmental interference, the signal can be recognized at 12.4 m and 5.2 m, respectively. • The receiver is made of Mn-PMNT fiber single crystals and Metglas and has an equivalent noise magnetic field of 3.1 pT/Hz1/2 whose detection sensitivity is better than multi-push-pull (MPP) magnetoelectric sensor (5.3 pT/Hz1/2). [ABSTRACT FROM AUTHOR]

Magnetoelectric (ME) sensors have been proven to have great performance on weak magnetic field detection with high sensitivity, low noise, broad bandwidth and low power consumption. In this work, a self-designed ME detection system consisting of a high-performance triaxial ME sensor was used for magnetic anomaly detection (MAD). As the core sensing element of the ME sensor, the laminated ME composites were made of Metglas laminates and Mn-doped PMN-PT single crystal fibers with in-plane series connection. The noise equivalent magnetic induction (NEB) of the ME sensors were below 6.28pT/Hz1/2 @ 1 Hz, and the limit detection of magnetic field is about 5 × 10−10 T, representing great performance to detect weak magnetic field. An experiment of detecting a real ship was conducted to test the performance of the triaxial ME detection system. To analyze the magnetic anomaly signal induced by the ship, a 3D finite element model (FEM) about the magnetic field distribution of the moving ship is developed. The estimated signals of the scalar total magnetic field and the motion parameters of the ship simulated by the proposed FEM match well with the experimental data, which proves the reliability of the model. The error analysis of the simulation was also discussed in detail. The experimental investigation reveals a promising application of ME sensor in MAD, while the proposed finite element model can be further modified to meet the analysis requirements on the detection of the magnetic anomaly induced by ferromagnetic targets with large dimension. • The noise equivalent magnetic induction of ME sensors are below 6.28pT/Hz1/2 @ 1 Hz. • Outdoor MAD experiment of a ship was conducted by a triaxial ME detection system. • FEM of magnetic anomaly for large dimension ferromagnetic targets was developed. • Motion parameters of the ship can be estimated by the propose FEM [ABSTRACT FROM AUTHOR]