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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]