Spin polarization vectors of field emitted electrons from Fe/W tips
Spin polarization vectors of field emitted electrons from Fe/W tips
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Fe/W 尖端场发射电子的自旋极化矢量
DOI：
10.1088/1367-2630/11/11/113031
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发表时间：
2009
影响因子：
3.3
通讯作者：
T. Mizoguchi
中科院分区：
文献类型：
--
作者：
T. Irisawa;T. Yamada;T. Mizoguchi
通过场离子显微镜和场发射显微镜研究了 5 nm Fe 薄膜热沉积前后 W 尖端顶部的原子和电子结构。准备了两种几何形状的 W 尖端：传统的半球形和凿子（扁针）型。半球形和凿子 W 尖端的 ⟨110⟩ 方向分别平行于和垂直于尖端轴线。发现涂覆的铁膜最有可能处于非晶相，并且具有较低的功函数，导致顶点电子发射的急剧变化。使用具有可旋转尖端机构的莫特探测器研究了这些 Fe/W 尖端场发射电子的自旋极化矢量。对于每个 Fe/W 都获得了类似的自旋极化矢量绝对值，而自旋极化矢量的方向取决于顶点的形状。对于半球形顶点，与尖端轴线的角度为 θ=45°，对于凿子顶点，与尖端轴线的角度为 θ=66°。具有这种 Fe/W 尖端旋转机构的自旋偏振扫描隧道显微镜装置使得检测样品磁化的面内和面外自旋分量成为可能。
The atomic and electronic structures at the apex of W tips were studied by means of field ion microscopy and field emission microscopy, before and after the thermal deposition of a 5 nm Fe film. Two geometries of W tip, a conventional hemi-spherical type and a chisel (flat needle) type, were prepared. The hemispherical and the chisel W tips had a ⟨110⟩ direction parallel and perpendicular to the tip axis, respectively. The coated Fe films were found to be most likely in a non-crystalline phase, and to have a lower work function leading to a drastic change in electron emission from the apexes. The spin-polarization vectors of field-emitted electrons from these Fe/W tips were investigated with a Mott detector with a rotatable mechanism of tips. A similar absolute value of the spin-polarization vector was obtained for each Fe/W, while the direction of the spin-polarization vector was dependent on the shape of the apex. The angle from the tip axis was θ=45° for the hemispherical apex and θ=66° for the chisel apex. A spin-polarized scanning tunneling microscopy setup with a rotation mechanism of such Fe/W tips made it possible to detect both the in-plane and the out-of-plane spin component of a sample magnetization.
影响因子：
64.8
作者：
Bode, M.;Heide, M.;Wiesendanger, R.
通讯作者：
Wiesendanger, R.
影响因子：
56.9
作者：
Meier, Focko;Zhou, Lihui;Wiesendanger, Roland
通讯作者：
Wiesendanger, Roland
影响因子：
56.9
作者：
Krause, S.;Berbil-Bautista, L.;Wiesendanger, R.
通讯作者：
Wiesendanger, R.