부산대학교 도서관

Different volume fractions of nanocrystals were induced in Metglas (FeSiB) of magnetoelectric (ME) antennas by isothermal heat treatment. When the volume fraction is 3.3%, the initial permeability and maximum piezomagnetic coefficient of the Metglas increase by 46% and 68%, respectively, compared with the pristine Metglas. The ME coupling coefficient ( $\alpha _{\text {ME}}$ ) of ME antenna at the resonance frequency and 1 kHz is 19890 and 1455 V/cm $\cdot $ Oe, respectively (216% and 197% higher than that of the pristine antenna). The ME antenna shows both enhanced reception and transmission performance. The direct detection limit is 0.3 pT [one order better than the pristine antenna (3.2 pT)]. The transmitting intensity at 30 cm in the long axis direction is enhanced by 148%. This result shows that the optimal volume fraction of nanocrystals in magnetic layers is essential for the performance of ME antennas and ME devices.