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題名: | 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. |
貢獻者: | 物理學系 |
關鍵詞: | Composite;Saturation magnetization;Ferromagnetic hysteresis |
日期: | 2010
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上傳時間: | 2013-02-05T02:20:39Z
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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 |
顯示於類別: | [物理學系] 期刊論文
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