Colossal magnetorsistance at room temperature in La_(0.8)Ba_(0.2)MnO_3 thin films

摘要

Recently, Mn perovskite oxides (La_(1-x)M_x)MnO_3 with M chemical bounds Ba, Ca, Sr etc...) are attracting attention due to their Colossal Magnetoresistance (CMR) phenomenon. In this study, we have noted the large magnetoresistance of (La, Ba)MnO_3 at near room temperature and have fabricated their thin films by pulsed laser deposition technique. Figure 1 shows temperature dependence of the MR effect under a magnetic field of 0.8 T in the La_(0.8)Ba_(0.2)MnO_3 bulk and films (thckness:400A, 650A, 1000A, 1300A and 3900A ) on SrTiO_3 (001) substrate. It is found that the MR effect of films is higher than that of the bulk (21