Size-dependent magnetic moments in ultrafine diamagnetic systems
Size-dependent magnetic moments in ultrafine diamagnetic systems
复制标题
超细抗磁系统中与尺寸相关的磁矩
DOI:
10.1063/1.3596818
复制
发表时间:
2011-06
影响因子:
3.2
通讯作者:
J. C. Nie
中科院分区:
文献类型:
--
作者:
J. Y. Yang;Y. Sun;L. He;C. M. Xiong;R. F. Dou;J. C. Nie
Recently, unusual magnetic properties were found experimentally in otherwise diamagnetic nanoparticles. Our experiments and analysis revealed that a universal expression can describe the size-dependent magnetic moments in ultrafine diamagnetic systems, including Au, Pd, and HfO2 nanoparticles. A model was presented to explain the observed phenomenon. It suggested that the up and down spins in ultrafine diamagnetic systems are spatially separated and form asymmetric spin-singlet pairs. The correlation lengths of the spin-singlet pairs in Au, Pd, and HfO2 nanoparticles were estimated to be about 1.65, 13, and 4.4 nm, respectively. On the basis of this model, we explain (a) the origin and the size dependence of magnetic moments in diamagnetic nanoparticles, and (b) the origin of the extremely large anisotropy in diamagnetic nanoparticles.
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