Electric-field-induced dielectric response and magnetization in nano-microscale lead-free multiferroic composite

摘要

A new kind of nano/microscale lead-free multiferroic composite with a formal of 0.4CoFe_2O_4-0.6[0.948(K_(0.5)Na _(0.5))NbO_3-0.052LiSbO_3] was prepared. The electric-field-induced dielectric (EID) and magnetization (EIM) behaviors were systemically investigated for this 0-3-type structured multiferroic ME composite. Significant electric-field-induced effects were obtained with a high tunability and a large EIM coefficient, which the former has a value of K = 3.35% under the low dc electric-field of 2 kV/cm and the later is in excess of 2.15 × 10~(-10) s/m at a low frequency of 1.0 kHz with a low magnetic bias field of 2000 Oe for this composite. It is also proved that its EIM behavior is strongly dependent on the bias magnetic field H Bias and the frequency of driving electric-field. The measured EIM has an excellent linear relationship with the applied ac electric-field with amplitude varying from 7.1 to 73.6 V/cm. The electric-field-induced effects indicate that the 0-3-type particulate ME composites not only have physical interest but also have potential practical use.