Magnetoresistance and colossal magnetoresistance manganites and relevant sample equipments

The Magnetoresistance (MR) effects were as high as 60% at room temperature in a thin film of doped Magnanites with the perovskite structure. The complex perovskite manganite R1-x DxMno3 (R = La, Pr, Sm. etc and D = Ca, Sr, Ba, Pb) showing colossal magnetoresistance (CMR) effect is one of the strongly correlated systems with firm interactions among the charge, spin, orbital and lattice degrees of freedom, like double exchange interaction, superexchange interaction, John-Taller distortion, Hund’s coupling, leading to complex electronic, Magnetic and structural phase diagrams. The phase separation, charge ordering and half Metallicity cause it as one of the hottest topics in condensed matter physics and various sample equipment have been designed with the development of the preparation technology and scientific research. Here, after a concise introduction of magnetoresistance and colossal Magnetoresistance (CMR) Manganites, Our main efforts are devoted to the following aspects: CMR effects in single-phase Manganite related to the sensitive spin-charge interaction and phase separation; rectifying property and negative/positive Magnetoresistance effect in Maganite/Nb:STO p-n junctions related to the special interface electronic structure; Magnetoelectric coupling effect in Maganite/ferroelectric structure taking advantage of the strain, carrier density and magnetic field sensitive properties.