TY - JOUR
T1 - Size distribution effect on the magnetization and magneto-resistance in ferromagnetic nanostructured manganites
AU - García, D.
AU - Alascio, B.
AU - Lamas, D. G.
AU - Niebieskikwiat, D.
AU - Caneiro, A.
AU - Sánchez, R. D.
AU - Cabanillas, E. D.
N1 - Funding Information:
This work was partially supported by ANPCyT (Argentina) through the PICT 03-05266, CONICET (Argentina) and Fundación Antorchas (Argentina).
PY - 2005/10
Y1 - 2005/10
N2 - 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 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.
AB - 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 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.
KW - A. Magnetic materials
KW - B. Sol-gel growth
KW - D. Electrical properties
KW - D. Magnetic properties
UR - http://www.scopus.com/inward/record.url?scp=28944451688&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2005.07.004
DO - 10.1016/j.jpcs.2005.07.004
M3 - Artículo
AN - SCOPUS:28944451688
SN - 0022-3697
VL - 66
SP - 1687
EP - 1694
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 10
ER -