In this paper, [(La0.9Sr0.1MnO3)n/(Pa0.9Ca0.1MnO3)n/(La0.9Sb0.1MnO3)n]m superlattices films have been.deposited on (001) Nb:SrTiO3 substrates by a laser molecular-beam epitaxy technology. Expected.ferroelectricity arise at well-defined tricolor super