Evidence for quantization of mechanical rotation of magnetic nanoparticles.
Evidence for quantization of mechanical rotation of magnetic nanoparticles.
复制标题
磁性纳米粒子机械旋转量子化的证据。
DOI：
10.1103/physrevlett.104.027202
复制
发表时间：
2010
影响因子：
8.6
通讯作者：
E. Chudnovsky
中科院分区：
文献类型：
--
作者：
J. Tejada;R. Zysler;E. Molins;E. Chudnovsky
我们报告了包含数千个原子的固体粒子旋转运动的量子化证据。研究了一种局限于聚合物腔内的CoFe2O4纳米粒子体系。通过x射线衍射、透射电子显微镜、等离子体质谱、铁磁共振（FMR）和磁化测量对颗粒进行了表征。磁和FMR数据证实了粒子的存在，这些粒子可以在空腔内自由旋转。在微波吸收对磁场的依赖中，发现了等距离的、与温度无关的跳跃。这一观测结果与轨道运动将低场吸收线分裂成多条线的预期一致。
We report evidence of the quantization of the rotational motion of solid particles containing thousands of atoms. A system of CoFe2O4 nanoparticles confined inside polymeric cavities has been studied. The particles have been characterized by the x-ray diffraction, transmission electron microscopy, plasma mass spectroscopy, ferromagnetic resonance (FMR), and magnetization measurements. Magnetic and FMR data confirm the presence of particles that are free to rotate inside the cavities. Equidistant, temperature-independent jumps in the dependence of the microwave absorption on the magnetic field have been detected. This observation is in accordance with the expectation that orbital motion splits the low-field absorption line into multiple lines.