Articles you may be interested inThe manipulation of magnetic properties by resistive switching effect in CeO2/La0.7(Sr0.1Ca0.9)0.3MnO3 system J. Appl. Phys. 113, 17C708 (2013); 10.1063/1.4795214Effect of (Bi, La)(Fe, Zn)O3 thickness on the microstructure and multiferroic properties of BiFeO3 thin films Measurements of the magnetization, specific heat, and 57 Fe Mössbauer spectrum are presented for Sr 2 LaFe 3 O 9 . The temperature dependence of the specific heat and magnetization indicates that Sr 2 LaFe 3 O 9 undergoes an antiferromagnetic transition at T N ϭ203 K. The small entropy removal ⌬S and small effective paramagnetic moment eff suggest an itinerant character for the Fe moment in this compound. In low applied fields, the zero field cooled ͑ZFC͒ and field cooled ͑FC͒ magnetization below T N exhibit a hysteretic behavior indicating the existence of some ferromagnetic correlation. This behavior is suppressed by high applied fields. The 57 Fe Mössbauer spectrum measured at 4.2 K for Sr 2 LaFe 3 O 9 indicates two superimposed hyperfine fields of 260 and 450 kOe with area ratios of 1/3 and 2/3, respectively, consistent with previous measurements.

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We present a theoretical model for calculating the spin-dependent cross section of the scattering of electrons by a magnetic layer system. Our model demonstrates that the cross sections of the scattering are different for spin up and spin down electrons. The model assumes that the electrical resistivity in a conductor is proportional to the scattering cross section of the electron in it. It is believed to support the two channel mechanism in interpreting magneto-resistance (MR). Based on the model without considering the scattering due to the interfacial roughness and the spin flipping scattering, we have established a relationship between MR and the square of the magnetic moment in the bulk sample without considering the scattering due to the interfacial roughness and the spin flipping scattering. It can also qualitatively explain the MR difference between the current in plane (CIP) and current perpendicular to the plane (CPP) configurations. The predictions by the model agree well with the experimental findings.

Recently the remarkable discovery of field-induced phase transition from antiferroelectric (AFE) to Ferroelectric (FE) in ferroelectrics excited the scientific community in this field. This finding has both scientific and technological implications to us. In this paper, we studied the changes of the crystal structure when an electrical field is applied to it. The X-ray diffraction pattern reflecting these changes was discussed by theoretical calculation.