Anisotropic magnetoresistance studies of polycrystalline La0.67Ca0.33MnO3

We have synthesized polycrystalline La0.67Ca0.33MnO3 by solid state reaction method and studied the structural, morphological, resistivity, magnetoresistance and anisotropic magnetoresistance properties of it with detailed analysis of anisotropic magnetoresistance. The X-ray diffraction study of our sample confirms the single phase nature of the prepared material. The temperature dependence of the DC electrical resistivity shows a peak, corresponding to metal-insulating transition, at T-MI similar to 264 K. Under an applied low magnetic field, the resistivity decreases from zero field resistivity and we have calculated the magnetoresistance and anisotropic magnetoresistance of our polycrystalline La0.67Ca0.33MnO3 with respect to temperature. We found high values of magnetoresistance and anisotropic magnetoresistance at low temperatures. We have also measured the angular dependence of resistivity at different temperatures for two different currents. We have found the effect of current on the anisotropic magnetoresistance which is essential in utilizing the polycrystalline La0.67Ca0.33MnO3 in device applications. (c) 2012 Elsevier B.V. All rights reserved.