We report on magnetisation and magneto-capacitance measurements in the Bi1-xLaxFeO3 series for 0 < x < 0.15. We confirm that doping with La reduces the threshold magnetic field Hc for cancelling the magnetic spiral phase, and we show that Hc decreases as the La content increases up to x=0.15, which is the highest concentration for maintaining the non-centrosymmetric rhombohedral structure of BiFeO3. Measurements of the dielectric constant as a function of magnetic field in the series also show a maximum magneto-capacitance for x=0.15.
@article{arxiv.0904.1707,
title = {Magnetization and magneto-electric effect in La-doped BiFeO3},
author = {G. Le Bras-Jasmin and D. Colson and A. Forget and N. Genand-Riondet and R. Tourbot and P. Bonville},
journal= {arXiv preprint arXiv:0904.1707},
year = {2009}
}