Giant microwave tunability in FeGaB/lead magnesium niobate-lead titanate multiferroic composites

Giant magnetoelectric coupling at both microwave frequencies and dc was observed in an FeGaB/lead magnesium niobate-lead titanate microwave multiferroic composite. A record high microwave frequency tunability of Delta f=900 MHz or Delta f/f=58% was demonstrated with the change of an external electric field from -6 to +2 kV/cm. A strong electric field dependence of magnetic hysteresis loops was also observed. Such multiferroic composite provides great opportunities for electrostatically tunable microwave devices. (C) 2008 American Institute of Physics.