Morphological and magnetic characterization of manganite oxide based nanowires and nanotubes

J.CURIALE; ....; PABLO EDUARDO LEVY; ET AL.

PHYSICA B - CONDENSED MATTER

Elsevier B.V.

Año: 2004 vol. 354 p. 98 - 103

0921-4526

Morphological and magnetic characterization of manganite J. Curiale, R.D. Sancheza, H.E. Troiani, H. Pastoriza, P. Levy, A.G. Leyva A morphological and magnetic study of sub-micrometric nanostructures of a manganese oxide-based compound La0.325 Pr0.300 Ca0.375 Mn O3 is presented. Nanowires of 50 and 100 nm and tubes with external diameters of 200 and 800 nm were synthesized. Scanning electron microscopy with EDS microanalysis (SEM) and transmission electron microscopy (TEM) allowed to characterize the morphology and microstructure of these nanostructures. The walls of the nanotubes are composed of on average 40nm grain size particles, while in nanowires the grains are much smaller, in the range between 4 and 20 nm. In both situations, the small grains present a random crystalline orientation, as it is con.rmed by TEM diffraction experiments. Magnetization measurements and hysteresis loops are presented and discussed based on magnetic interaction between the grains, anisotropy considerations and reversal magnetization mechanisms. 2004 Elsevier B.V. All rights reserved.