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Surface spin glass behavior in sol-gel derived La0.7Ca0.3MnO3 nanotubes
Satyendra Singh1, S B Krupanidhi
1Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India.
We fabricated lanthanum calcium manganite nanotubes (LCMONTs) using a modified sol-gel method. These nanotubes exhibit surface spin glass behavior, indicated by magnetic irreversibility and a peak in magnetization curves.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Lanthanum calcium manganite (La(0.7)Ca(0.3)MnO(3)) exhibits interesting magnetic properties.
- Nanostructured materials can display unique physical characteristics compared to their bulk counterparts.
Purpose of the Study:
- To fabricate La(0.7)Ca(0.3)MnO(3) nanotubes (LCMONTs).
- To investigate the magnetic properties and potential surface spin glass behavior of LCMONTs.
Main Methods:
- Modified sol-gel method utilizing nanochannel alumina templates for nanotube synthesis.
- High-resolution transmission electron microscopy (HRTEM) for structural characterization.
- Magnetization measurements (zero field cooling and field cooling) to probe magnetic behavior.
Main Results:
- Successfully fabricated LCMONTs with a diameter of approximately 200 nm.
- HRTEM confirmed LCMONTs are composed of randomly aligned nanoparticles (8-12 nm).
- Observed strong irreversibility between ZFC and FC magnetization curves, with a ZFC peak, suggesting surface spin glass behavior.
Conclusions:
- The fabrication method is effective for producing LCMONTs.
- The magnetic properties indicate the presence of surface spin glass behavior in these La(0.7)Ca(0.3)MnO(3) nanotubes.
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