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

Abstract

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.

Authors:
; ;  [1]
  1. Department of Studies and Research in Physics, Kuvempu University, Shankarghatta Shimoga-577451 (India)
Publication Date:
OSTI Identifier:
22004082
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1447; Journal 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); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Lamani, Ashok. R., Jayanna, H. S., and Prasanna, G. D. Line profile analysis and low temperature AC susceptibility of Cu-Zn ferrites. United States: N. p., 2012. Web. doi:10.1063/1.4710477.
Lamani, Ashok. R., Jayanna, H. S., & Prasanna, G. D. Line profile analysis and low temperature AC susceptibility of Cu-Zn ferrites. United States. doi:10.1063/1.4710477.
Lamani, Ashok. R., Jayanna, H. S., and Prasanna, G. D. Tue . "Line profile analysis and low temperature AC susceptibility of Cu-Zn ferrites". United States. doi:10.1063/1.4710477.
@article{osti_22004082,
title = {Line profile analysis and low temperature AC susceptibility of Cu-Zn ferrites},
author = {Lamani, Ashok. R. and Jayanna, H. S. and Prasanna, G. D.},
abstractNote = {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.},
doi = {10.1063/1.4710477},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1447,
place = {United States},
year = {2012},
month = {6}
}