101. Anomalous magnetic behavior of La0.6Sr0.4MnO3 nano-tubes constituted with 3–12 nm particles
- Author
-
S. B. Krupanidhi and Nirupam Banerjee
- Subjects
Nanotube ,Materials science ,Nanoparticle ,Nanotechnology ,General Chemistry ,Condensed Matter::Materials Science ,Magnetization ,Chemical engineering ,Nano ,General Materials Science ,Crystallite ,Selected area diffraction ,High-resolution transmission electron microscopy ,Nanoscopic scale - Abstract
Uniform La0.6Sr0.4MnO3 (LSMO) nanotubes of an average diameter 180 nm were synthesized by a modified sol–gel method employing nanochannel porous anodic alumina templates. The nanotubes were characterized chemically and structurally by XRD, SEM, EDX, and TEM. Postannealed (700 °C for 1 h hour) nanotubes were found to be polycrystalline from XRD and SAED studies. To get further insight into the nanotube structure, HRTEM studies were done, which revealed that obtained LSMO nanotubes were structurally constituted with nanoparticles of 3–12 nm size. These constituent nanoparticles were randomly aligned and self-knitted to build the nanotube wall. Investigation of magnetic properties at this structured nanoscale revealed remarkable irreversibility between the zero field cooling (ZFC) and field cooling (FC) magnetization curves accompanied with a peak in the ZFC curve indicating spin-glass-like behavior. Structural defects and compositional variations at surfaces and grain-boundaries of constituent nanoparticles might be responsible for this anomalous magnetic behavior.
- Published
- 2012