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向列相液晶中铁电纳米粒子悬浮液的指向性和偏振涨落Director and polarization fluctuations in suspensions of ferroelectric nanoparticles in nematic liquid crystals |
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| 课程网址: | http://videolectures.net/slonano07_mertelj_dpf/ |
| 主讲教师: | Alenka Mertelj |
| 开课单位: | 约瑟夫·斯特凡学院 |
| 开课时间: | 2008-02-12 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | Phase separated state of thin films of (Pr0.6Ca0.4)MnO3 on LaAlO3 and SrTiO3 substrates was investigated by means of the ultrafast time-resolved magnetooptics in the magnetic field up to 1.1 T. The photoinduced Kerr rotation and ellipticity show remarkably different magnetic-field dependence. From comparison with the static Kerr rotation and ellipticity we conclude that two different magnetic phases are present in the samples at low temperatures. According to small angle neutron scattering results one of the phases originates from nanoscopic ferromagnetic metallic clusters. Temporal dependence of the photoinduced Kerr signals indicates that upon photoexcitation changes of the volume fraction of these phases take place on a timescale of a few tens of picoseconds. |
| 关 键 词: | 相分离状态; 磁场依赖; 磁相 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-07-28：yumf |
| 阅读次数: | 52 |