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An optimal annealing condition (360 °C, 10 min) was found for the FeBSiC Metglas, at which the Metglas transformed into a mix phase structure between amorphous and crystalline. It gives a deformation of single-layer FeBSiC Metglas ribbon increases from 26.9 ppm of the unannealed sample to 34.6 ppm, piezomagnetic coefficient d33,m from 1.9 to 2.6 ppm/Oe, and the loss decreases from 0.18 to 0.07%. After the mix phase Metglas and Mn-doped 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (Mn-doped PMN-PT) single crystal were fabricated into a magnetoelectric (ME) laminate composite, it is found that αQ at quasi-static and resonance frequency rises from 2183 to 2640 pC/Oe, and from 120,000 to 165,000 pC/Oe, with the increase amplitude of 21% and 37.5%, respectively. From test of realistic noise, the equivalent noise magnetic field (EMN) @1 Hz of the ME sensor made by mix phase Metglas declines from 20.2 to 15.4 pT/Hz1/2, and EMN@30 Hz from 1.46 to 1.23 pT/Hz1/2. The reinforcement of the piezomagnetic performance is attributed to the generation of mix phase structure. It can enhance ME coupling performance at quasi-static and resonance state, reduce loss, and boost the sensitivity of the ME sensor. [ABSTRACT FROM AUTHOR]

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]