Large Magnetoresistance through a Single Molecule due to a Spin-Split Hybridized Orbital
Large Magnetoresistance through a Single Molecule due to a Spin-Split Hybridized Orbital
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DOI：
10.1021/nl301802e
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发表时间：
2012-09-01
期刊：
影响因子：
10.8
通讯作者：
Barreteau, C.
中科院分区：
文献类型：
--
作者：
Kawahara, S. L.;Lagoute, J.;Barreteau, C.
在自旋电子器件中使用有机材料，由于其灵活性、低成本、长自旋寿命和易于功能化，对未来的应用提出了很多期望。然而，有机层和铁磁电极之间的界面杂化和自旋极化仍然需要在分子尺度上理解。结合最先进的自旋极化扫描隧道光谱和自旋分辨从头算，我们首次给出了在与磁性材料(即Cr（001）表面接触的单个非磁性C-60分子上分子轨道自旋分裂的实验证据。这种杂化的分子状态导致了隧穿磁电阻随能量的符号反转。这一结果为通过分子轨道进行自旋过滤开辟了道路。
Using organic materials in spintronic devices raises a lot of expectation for future applications due to their flexibility, low cost, long spin lifetime, and easy functionalization. However, the interfacial hybridization and spin polarization between the organic layer and the ferromagnetic electrodes still has to be understood at the molecular scale. Coupling state-of-the-art spin-polarized scanning tunneling spectroscopy and spin-resolved ab initio calculations, we give the first experimental evidence of the spin splitting of a molecular orbital on a single non magnetic C-60 molecule in contact with a magnetic material, namely, the Cr(001) surface. This hybridized molecular state is responsible for an inversion of sign of the tunneling magnetoresistance depending on energy. This result opens the way to spin filtering through molecular orbitals.