Surface Spin Polarization of Fe Nanoclusters

Surface Spin Polarization of Fe Nanoclusters
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Fe 纳米团簇的表面自旋极化

DOI:
10.1109/tmag.2010.2045482
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发表时间:
2010
影响因子:
2.1
通讯作者:
Pratt A
Pratt A
中科院分区:
工程技术4区
文献类型:
--
作者:
Pratt A

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用自旋极化的亚稳氦束研究了Fe纳米团簇表面的自旋极化。在气体聚集源中产生的团簇呈现对数正态尺寸分布,峰中心位于~11 nm。在干净的Si(111)衬底上同时沉积了不同覆盖度的球形和长方体颗粒,并用极灵敏的亚稳去激发光谱(MDS)技术进行了研究。当标称的团簇覆盖率为8?时,当He自旋平行和反平行于团簇的磁化方向时,其出射电子产额的最大不对称性约为10%。与在不同衬底上外延Fe膜所得的值相比,测量的不对称性表明表面自旋极化得到了增强,正如理论所提出的那样。用透射电子显微镜和扫描电子显微镜研究了团簇的原子结构及其在Si(111)衬底上的形貌。
The spin polarization at the surface of Fe nanoclusters has been probed using a spin-polarized metastable helium beam. The clusters, produced in a gas aggregation source, display a lognormal size distribution with a peak centered at ~11 nm. Varying coverages of both spheroid- and cuboid-shaped particles were concomitantly deposited onto clean Si(111) substrates for investigation with the extremely surface sensitive technique of metastable de-excitation spectroscopy (MDS). A nominal cluster coverage of 8 ¿ yielded a maximum asymmetry of ~10% in the ejected electron yield for He spins aligned parallel and anti-parallel to the magnetization direction of the clusters. When compared to values obtained from epitaxial Fe films on various substrates, the measured asymmetry suggests an enhancement in the surface spin polarization, as theoretically proposed. The atomic structure of the clusters and their topography on the Si(111) substrates were studied with transmission and scanning electron microscopy.
纳米团簇和团簇组装薄膜中的磁性。
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