Investigations of magnetic and dielectric properties of cupric oxide nanoparticles

Cupric oxide nanoparticles of ∼8–10 nm width and 40–45 nm length self assembled as large particles ∼1–1.5 μm have been investigated, in the 10–325 K temperature range, using magnetic and dielectric measurements. In magnetic measurements a single broad peak at ∼230 K in a zero field cooled sample has...

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Bibliographic Details
Published in:Solid state communications 2011, Vol.151 (1), p.55-60
Main Authors: Bhalerao-Panajkar, Rohini S., Shirolkar, Mandar M., Das, Raja, Maity, Tuhin, Poddar, Pankaj, Kulkarni, S.K.
Format: Article
Language:English
Subjects:
A. CuO nanoparticles
A. Dielectric
A. Ferromagnetic
Antiferromagnetism
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
CUPRIC OXIDE
D. Ferroelectric transition
Dielectric properties of solids and liquids
DIELECTRIC STRENGTH
Dielectrics
Dielectrics, piezoelectrics, and ferroelectrics and their properties
ELECTRICAL PROPERTIES
Exact sciences and technology
Ferromagnetism
INSULATION (ELECTRICAL)
MAGNETIC PROPERTIES
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetization
Materials science
Nanocrystalline materials
Nanoparticles
Nanoscale materials and structures: fabrication and characterization
OXIDES
PARTICLES
Permittivity (dielectric function)
Physics
Shells
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Summary:Cupric oxide nanoparticles of ∼8–10 nm width and 40–45 nm length self assembled as large particles ∼1–1.5 μm have been investigated, in the 10–325 K temperature range, using magnetic and dielectric measurements. In magnetic measurements a single broad peak at ∼230 K in a zero field cooled sample has been observed. Coercivity, in magnetization measurements at 10 K, suggests that the nanoparticles are core-shell type particles with an antiferromagnetic core and a ferromagnetic shell. Dielectric measurements, at various frequencies from 3.7 Hz to 949 kHz, exhibit a sharp peak at 284 K followed by weak anomalies around 213 and 230 K. ► 8 nm width oriented nanoparticles self assembled as large particles ∼1 μm. ► Enhanced coercivity with exchange bias in 10 K magnetic measurements. ► Sharp peak in dielectric measurements at 284 K. ► Are core-shell type with an antiferromagnetic core and a ferromagnetic shell.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2010.10.024