TY - JOUR
T1 - Investigating negative magnetization and blocking temperature in aggregates of ferrite nanoparticles
AU - Obaidat, I. M.
AU - Issa, B.
AU - Albiss, B. A.
AU - Haik, Y.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2015/10/12
Y1 - 2015/10/12
N2 - Blocking temperatures of aggregates of Mn0.5Zn0.5GdxFe(2-x)O4 ferrite nanoparticles, with x = 0.02, 0.05, 0.11, 0.15, and 0.2, were obtained from the zero-field-cooled (ZFC) magnetization measurements. We found a nonmontonic behavior of the blocking temperature with increasing size of the particles. The effective magnetic anisotropy was calculated and found to have two distinct rates of increase with decreasing the size of the particles. These results were attributed to the strong inter-particle interactions in the aggregated nanoparticles and to the enhanced role of surface anisotropy with the decrease of the size of the particles. In three samples, the ZFC magnetization was found to exhibit a significant negative magnetization in a considerable part of the low temperature region. To our knowledge, this is the first time that negative magnetization is reported in such nanoparticles. These peculiar results are discussed and are currently under investigation.
AB - Blocking temperatures of aggregates of Mn0.5Zn0.5GdxFe(2-x)O4 ferrite nanoparticles, with x = 0.02, 0.05, 0.11, 0.15, and 0.2, were obtained from the zero-field-cooled (ZFC) magnetization measurements. We found a nonmontonic behavior of the blocking temperature with increasing size of the particles. The effective magnetic anisotropy was calculated and found to have two distinct rates of increase with decreasing the size of the particles. These results were attributed to the strong inter-particle interactions in the aggregated nanoparticles and to the enhanced role of surface anisotropy with the decrease of the size of the particles. In three samples, the ZFC magnetization was found to exhibit a significant negative magnetization in a considerable part of the low temperature region. To our knowledge, this is the first time that negative magnetization is reported in such nanoparticles. These peculiar results are discussed and are currently under investigation.
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U2 - 10.1088/1757-899X/92/1/012011
DO - 10.1088/1757-899X/92/1/012011
M3 - Conference article
AN - SCOPUS:84947072333
SN - 1757-8981
VL - 92
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012011
T2 - International Conference on Advanced Materials, ICAM 2015
Y2 - 27 April 2015 through 29 April 2015
ER -