Room temperature reversible tuning of magnetism of electrolyte-gated La0.75Sr0.25MnO3 nanoparticles

Reversible control of magnetization and Curie temperature (TC) by electrostatic modulation of the surface charge carrier density is presented for the strongly correlated La0.75Sr0.25MnO3 (LSMO) system. The nanoparticulate LSMO was synthesized by spray pyrolysis. A controlled post annealing was carried out to obtain a sharp magnetic transition slightly above room temperature along with favorable surface-to-volume ratios. Resulting nanoporous LSMO was electrostatically charged using a non-aqueous electrolyte with applied voltage limited within the purely capacitive window. The electrostatic charging effect on magnetization was investigated around TC for varying temperatures and applied magnetic fields. The resultant magnetization modulation upon charging is discussed in terms of the reversible electrostatic hole doping.