EMR study of magnetic inhomogeneities in crystalline bulk and nanometer-sized La_0.7Ca_0.3MnO₃

详细信息	查看全文 | 推荐本文 |

• 作者：A.I. Shames ; E. Rozenberg ; Ya.M. Mukovskii ; E. Sominski ; A. Gedanken
• 关键词：Ferromagnetic and electron paramagnetic resonance ; Bulk- and nanometer-sized CMR-doped manganite
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2008
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：July 2008
• 卷：320
• 期：14
• 页码：e8-e11
• 文件大小：252 K

摘要

Electron magnetic resonance (EMR) was studied on crystalline bulk and nanometer-sized samples of the same La_0.7Ca_0.3MnO₃ manganite compound aiming to compare their magnetic homogeneities. The results obtained show that single-crystalline bulk sample is less homogeneous than the nanocrystalline one. Except for higher homogeneity, the nanometer-sized sample also demonstrates a weaker magnetic anisotropy. As a result, well-pronounced coexistence of different magnetic phases (coexistence of ferromagnetic and paramagnetic resonance signals) is observed in the bulk sample, while it is absent in the nanocrystalline one. It is suggested that such strong difference is directly connected to the difference in structural state of the samples.