Giant Converse Magnetoelectric Effect in PZT/FeCuNbSiB/FeGa/FeCuNbSiB/PZT Laminates Without Magnetic Bias Field

We reported a giant self-biased converse magnetoelectric (CME) effect in laminated composites consisting of gradedmagnetostrictive FeCuNbSiB/FeGa/FeCuNbSiB layers sandwiched between two electro-parallel-connected PZT piezoelectric plates. The great different magnetic characteristics (such as magnetic permeability and coercivity) in FeGa and nanocrystalline foil FeCuNbSiB result in a large internal magnetic field and remanent piezomagnetic coefficient in FeCuNbSiB/FeGa/FeCuNbSiB, which account for the giant self-biased CME effect. The experimental results show that: 1) a large remanent CME coefficient of 2.228 × 10^-3 mGs · cm/V is achieved, which can be used for realizing miniature electrically controlled magnetic flux devices; 2) the dynamic switching of magnetic flux between bistable states in PZT/FeCuNbSiB/FeGa/FeCuNbSiB/PZT through a smaller ac voltage (1 Vrms) controlling is realized; and 3) the induced magnetic induction B has an excellent linear relationship with applied ac voltage V_in.