Unexpected Magnetic Moments in Ultrafine Diamagnetic Systems
Unexpected Magnetic Moments in Ultrafine Diamagnetic Systems
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DOI：
10.1021/jp104031y
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发表时间：
2010-07
影响因子：
3.7
通讯作者：
Lin He
中科院分区：
文献类型：
--
作者：
Lin He
在最近文献(Science 2010,327,843.)中报道的实验结果的基础上，我们引入了一个超细反磁系统中上下自旋在空间上分离的模型。这些系统中的净磁矩是由空间自旋密度分布的不平衡引起的。这一机制不同于两种著名的磁学范式，即定域铁磁和巡游铁磁。该模型还定量地考虑了直径和保护剂对体系磁矩的影响。我们的发现开辟了一条不掺杂磁性离子的室温铁磁半导体的新途径。
On the basis of recent experimental results reported in the literature (Science 2010, 327, 843.), we introduce a model in which the up and down spins within ultrafine diamagnetic system are spatially separated. The net magnetic moments within these systems arise from the imbalance between the spatial spin density distributions. This mechanism is distinct from that of the two well-known paradigms for magnetism, i.e., the localized ferromagnetism and the itinerant ferromagnetism. The influences of diameter and protective agents on the magnetic moments of these systems are also quantitatively taken into account in the proposed model. Our finding opens a new route toward room temperature ferromagnetic semiconductors without doping magnetic ions.