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题名: Magnetization Processes of (La0.7Pb0.3MnO3)1−x(SiO2)x Composites
作者: Young, S. L.;Wu, T. C.;Horng, Lance;Lin, C. H.;Chen, H. Z.;Kao, M. C.;Ou, C. R.;Shih, N. F.;Shi, J. B.
贡献者: 物理學系
关键词: Composite;Saturation magnetization;Ferromagnetic hysteresis
日期: 2010
上传时间: 2013-02-05T02:20:39Z
出版者: Springer Science+Business Media
摘要: The ceramic composites, (La0.7Pb0.3MnO3)1−x
(SiO2)x , with diluted magnetic properties are prepared using
solid-sate sintering route. Magnetization processes of
(La0.7Pb0.3MnO3)1−x (SiO2)x composites are explored in
this study. Ferromagnetism is gradually attenuated due to
the magnetic dilution induced by the increase of SiO2 content.
Clearly, irreversible behavior is observed in the zerofield
cooling and the field cooling (ZFC–FC) curves at a low
field of 100 Oe. Saturation magnetization decreases as x increases
while ferromagnetic transition temperature remains
around 346 K for all composites. All the composites exhibit
ferromagnetic hysteresis behavior which can be modeled
by the law of the approach to saturation in the form
M = MS(1 − a/H). The term a/H expresses the deviation
of magnetization from saturation. The smaller factor a
for La0.7Pb0.3MnO3-rich samples results in sharper square
curve which should be associated with the long-range spin
order of ferromagnetic coupling.
關聯: Journal of Superconductivity and Novel Magnetism, 23(6): 953-956
显示于类别:[物理學系] 期刊論文

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