论文标题
来自铁磁表面的自旋依赖性亚稳态（$ 2^3s $）散射：潜在的偏光生产应用
Spin-dependent metastable He ($2^3S$) atom scattering from ferromagnetic surfaces: Potential application to polarized-gas production
论文作者
论文摘要
自旋偏振三重亚稳态氦（He*）束已被用作表面磁性的探针，但是从表面散射过程中旋转状态的变化仍然不清楚。在本研究中，我们通过构建一种使我们能够将自旋偏振的束引导到表面并测量从表面散射的He*的自旋极化的设备来探讨了这一问题。磁性己酮均用于光束极化和自旋分析。与自旋相关的他*散射实验的结果在干净的fe $ _3 $ o $ _4 $（100），h端的fe $ _3 $ _3 $ _4 $ _4 $（100），苯 - 备用的fe $ _3 $ _3 $ o $ $ $ _4 $ _4 $（100），100）和非磁性cu（100）表面散布，在这些方向上，在这些方向上，在这些方向上，在这些方向上*生存的旋转触发散射发生在最高约0.1的概率上。我们的结果表明，当He*的旋转和Fe $ _3 $ o $ _4 $（100）胶片平行时，生存率较高，可以根据这种旋转方向的较低的He*共振电离速率来理解。根据我们的发现，我们估计一种非偏振的He*气体在与干净的Fe $ _3 $ o $ _4 $（100）表面发生碰撞后变为10％自旋偏振。
A spin-polarized triplet metastable helium (He*) beam has been used as a probe for surface magnetism, but changes in the spin state during scattering from a surface remain unclear. In the present study, we explored this issue by constructing an apparatus that allows us to direct a spin-polarized He* beam to a surface and measure the spin polarization of He* scattered from the surface. Magnetic hexapoles were used for both the beam polarization and the spin analysis. The results of the spin-dependent He* scattering experiments on clean Fe$_3$O$_4$(100), H-terminated Fe$_3$O$_4$(100), benzene-adsorbed Fe$_3$O$_4$(100), and non-magnetic Cu(100) surfaces indicated that although the spin direction of He* was mostly preserved during scattering from these surfaces, spin-flop scattering of surviving He* occurred with a probability up to approximately 0.1. Our results showed that the survival probability was higher when the spins of He* and the Fe$_3$O$_4$(100) film were parallel, which can be understood based on the lower He* resonance ionization rate for this spin orientation. Based on our findings, we estimate that a non-polarized He* gas becomes 10% spin-polarized after a single collision with a clean Fe$_3$O$_4$(100) surface.
