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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Charge-transfer ferromagnetism in oxide nanoparticles
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Charge-transfer ferromagnetism in oxide nanoparticles

机译：氧化物纳米粒子中的电荷转移铁磁性

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A new model is proposed for ferromagnetism associated with defects in the bulk or at the surface of nanoparticles. The basic idea is that a narrow, structured local density of states N-s(E) is associated with the defects, but the Fermi level ( which may lie above or below a mobility edge) will not normally coincide with a peak in N-s( E). However, if there is a local charge reservoir, such as a dopant cation coexisting in two different charge states or a charge-transfer complex at the surface, then it may be possible for electron transfer to raise the Fermi level to a peak in the local density of states, leading to Stoner splitting of N-s( E). Spontaneous Stoner ferromagnetism can arise in percolating defect-rich regions, such as the nanoparticle surface. The charge-transfer ferromagnetism model may be applicable to a wide range of nanoparticles and thin films of dilute magnetic oxides have previously been regarded as dilute magnetic semiconductors.
机译：提出了一种新的铁磁性模型，该模型与纳米粒子整体或表面的缺陷有关。基本思想是，缺陷的状态与狭窄的，结构化的局部态密度Ns（E）相关，但是费米能级（可能位于迁移率边缘之上或之下）通常不会与Ns（E）中的峰值重合。但是，如果存在局部电荷库，例如以两种不同的电荷状态共存的掺杂剂阳离子或表面上的电荷转移复合物，则电子转移可能将费米能级提高到局部的峰值。状态密度，导致斯通纳分裂Ns（E）。自发的斯托纳铁磁性会出现在渗漏的缺陷丰富区域，例如纳米粒子表面。电荷转移铁磁性模型可能适用于广泛的纳米粒子，并且稀磁性氧化物的薄膜先前已被视为稀磁性半导体。

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