Observation of a high negative spin polarization at the Fe/MgO(100) surface oxidized at room temperature
Observation of a high negative spin polarization at the Fe/MgO(100) surface oxidized at room temperature
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室温氧化的 Fe/MgO(100) 表面观察到高负自旋极化
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Y. Yamauchi
中科院分区：
文献类型：
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作者：
M. Kurahashi;X. Sun;S. Entani;Y. Yamauchi
用自旋极化亚稳氦束（一种对表面极其敏感的自旋探针）在强磁场（0-50 kOe）下研究了室温氧化Fe/MgO（100）表面的自旋极化。铁表面的自旋极化，虽然它最初随着氧气暴露而衰减，但在>20 L（1 L=10−6 Torr sec）时增加，并且变得与>100 L时对干净铁表面观察到的结果相当。 极化是负的，在费米能级附近特别高。如果我们假设Fe 3 O 4的形成，这就可以理解。
Spin polarization of an Fe/MgO(100) surface oxidized at room temperature has been analyzed with a spin-polarized metastable helium beam, which is an extremely surface sensitive spin probe, under high magnetic fields (0–50 kOe). The spin polarization of the Fe surface, although it initially decays with oxygen exposure, increases at >20 L (1 L=10−6 Torr sec) and becomes comparable to that observed for a clean Fe surface at >100 L. The polarization is negative and especially high at around the Fermi level. This may be understood if we assume the formation of Fe3O4.