Size distribution effect on the magnetization and magneto-resistance in ferromagnetic nanostructured manganites |
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Authors: | D García DG Lamas D Niebieskikwiat RD Sánchez ED Cabanillas |
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Institution: | a Comisión Nacional de Energía Atómica-Centro Atómico Bariloche and Instituto Balseiro, (R8402AGP) S.C. de Bariloche, Pcia de Río Negro, Argentina b CINSO (Centro de Investigaciones en Sólidos), CITEFA-CONICET, J.B. de La Salle 4397, (1603) Villa Martelli, Pcia de Buenos Aires, Argentina c Comisión Nacional de Energía Atómica-Centro Atómico Constituyentes, Gral. Paz 1499, (1650) San Martín, Pcia de Buenos Aires, Argentina |
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Abstract: | We present experimental data of magnetization and magneto-resistance of nanostructured La2/3B1/3MnO3 with B=Ca, Sr, which present difference between the coercive field in the magnetization loop with their corresponding maximum value in the magneto-resistance. This difference is described by a model that include, size distribution of magnetic particles, randomly oriented anisotropy axis and electronic transfer between the particles, which is mediated by spin-polarized tunneling process. Also, the model predicts that the maximum magneto-resistance can be, in the magnetic disorder state, two times larger than the experimental value. The model results can be used to estimate the size dispersion of nanoparticles in similar systems. |
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Keywords: | 73 63Bd 75 47Lx 75 50 Tt |
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