Magnetoelectric measurements on Bi5FeTi3O15 and Bi6Fe2Ti3O18

Bi5FeTi3O15 and Bi6Fe2Ti3O18 are members of the Aurivillius family of compo unds having simultaneous electrical and magnetic ordering. Magnetoelectric measurements carried out in a linear time-varying magnetic field with an al ternating-current field superimposed yielded a non-linear signal. The shift from linearity, which is not usually observed for antiferromagnetic materi als, may be due the tilt in the octahedra. The variation of the magnetoelec tric output with temperature for Bi5FeTi3O15 and Bi6Fe2Ti3O18 indicated mag netic anomalies with enhanced sensitivity, corresponding to those in magnet ization data.