Size distribution effect on the magnetization and magneto-resistance in ferromagnetic nanostructured manganites

Abstract:

We present experimental data of magnetization and magneto-resistance of nanostructured La 2/3B 1/3MnO 3 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 pbkp_redicts 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. © 2005 Elsevier Ltd. All rights reserved.

Año de publicación:

2005

Keywords:

• A. Magnetic materials
• D. Magnetic properties
• D. Electrical properties
• B. Sol-gel growth

Fuente:

scopus