We show that hybrid MnO_x/C₆₀ heterojunctions can be used to design a storage device for spin-polarized charge: a spin capacitor. Hybridization at the carbon-metal oxide interface leads to spin-polarized charge trapping after an applied voltage or photocurrent. Strong electronic structure changes, including a 1-eV energy shift and spin polarization in the C₆₀ lowest unoccupied molecular orbital, are then revealed by x-ray absorption spectroscopy, in agreement with density functional theory simulations. Muon spin spectroscopy measurements give further independent evidence of local spin ordering and magnetic moments optically/electronically stored at the heterojunctions. These spin-polarized states dissipate when shorting the electrodes. The spin storage decay time is controlled by magnetic ordering at the interface, leading to coherence times of seconds to hours even at room temperature.

我们表明，混合MnO _x / C ₆₀异质结可用于设计自旋极化电荷的存储设备：自旋电容器。在施加电压或光电流之后，碳-金属氧化物界面处的杂化导致自旋极化的电荷捕获。强大的电子结构变化，包括C _60中的1-eV能量漂移和自旋极化然后与密度泛函理论模拟相一致，通过X射线吸收光谱法揭示了最低的未占据分子轨道。Muon自旋光谱学测量进一步提供了独立的证据，证明了在异质结处光学/电子存储的局部自旋排序和磁矩。当电极短路时，这些自旋极化状态会消散。自旋存储的衰减时间通过界面处的磁性排序来控制，即使在室温下，其相干时间也可达到数秒至数小时。