Line profile analysis and low temperature AC susceptibility of Cu-Zn ferrites

Journal Article · Tue Jun 05 00:00:00 EDT 2012 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4710477· OSTI ID:22004082

Lamani, Ashok R; Jayanna, H S; Prasanna, G D ^[1]

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1. Department of Studies and Research in Physics, Kuvempu University, Shankarghatta Shimoga-577451 (India)

The Cu{sub 1-x}Zn{sub x}Fe{sub 2}O{sub 4} (x = 0, 0{center_dot}2, 0{center_dot}4, 0{center_dot}6, 0{center_dot}8, 1.0) samples were prepared using double sintering ceramic method by adding Zn{sup 2+} at different concentration. The X-ray line profile analysis were carried out to confirm the spinel phase formation as well as to know the (%) strain in the crystal. The real and imaginary part of a.c. susceptibility measured from 77K to room temperature. The high temperature peak corresponds to magnetic blocking of individual particles, while the low temperature peak is attributed to surface spin-glass freezing. To prove the dynamics of the spin (dis)order in both regimes of freezing and blocking, the frequency dependent ac susceptibility is investigated under a biasing dc field. The frequency shift in the ''frozen'' low-temperature ac susceptibility peak is fitted to a dynamic scaling law which indicates a spin-glass phase. Exchange bias is turned on at low temperature which signifies the existence of a strong core-shell interaction.

• OSTI ID: 22004082
• Journal Information: AIP Conference Proceedings, Vol. 1447, Issue 1; Conference: 56. DAE solid state physics symposium 2011, Kattankulathur, Tamilnadu (India), 19-23 Dec 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
CERAMICS
CHANNELING
CONCENTRATION RATIO
COPPER COMPOUNDS
CRYSTALS
FERRITES
FREEZING
FREQUENCY DEPENDENCE
MAGNETIC SUSCEPTIBILITY
SINTERING
SPIN
SPIN GLASS STATE
STRAINS
SURFACES
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
ZINC COMPOUNDS
ZINC IONS