Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.54: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Magnetic interactions and anisotropies present in ferromagnetic nanotubes of manganites — •Rodolfo D. Sanchez1,2, Javier Curiale1, Horacio Troiani1, Alejandro Butera1, Ana G. Leyva3, and Pablo Levy3 — 1Centro Atómico Bariloche (CNEA), Av. Bustillo 9500 Bariloche (RN-8400), Argentina — 2I Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany — 3Centro Atómico Constituyentes (CNEA), Av. Gral Paz 1499 (B1650KNA), Buenos Aires, Argentina
We present a work about FM manganites with tubular morphology at the nanoscale. Although their FM transition temperatures (Tc) are close to the bulk, the rest of their magnetic properties are notably affected. These tubes have an external diameter of 800nm and their walls are constituted by an assembly of nanoparticles with size of 25nm. The wall thicknesses are 45 nm for LSMO and 60 nm for LCMO. Our previous study[1] shows that each grain is a single magnetic domain, with a thick dead layer on the surface and dipolar magnetic interactions between them. In order to characterize completely the interactions between the magnetic nanograins, we show First-Order Reversal Curves (FORC) diagrams. We also discuss the role of the interaction in the configuration of the magnetic moments. FM resonance results on aligned LSMO nanotubes complete this study, with information about the magnetic anisotropies present in the system.
[1] J. Curiale,et al. Phys. Rev. B 75, 224410 (2007) RDS acknowledges financial support of DFG (via its Leibniz-Program) during his stay in Göttingen.