Abstract
We propose a spin diode based on an organic magnetic co-oligomer or a magnetic/nonmagnetic heterojunction structure. The current and its spin polarization in the device are calculated with the spin-dependent Landauer-Büttiker formula. It is found that, by reversing the applied bias, the charge current and the spin current (SC) may be rectified at the same time or separately. A normal charge-current rectification usually takes place if the spatial electric structure is asymmetric. While a spin-current rectification may appear in two forms or their combination: one is that the spin-polarized orientation keeps unchanged but the magnitude of the SC is asymmetric with the bias; another is that only the spin orientation of the SC flips when the bias is reversed. By designing a suitable organic spin device, either of the two kinds of spin-current rectifications is obtained in our calculations. Finally, the effects of the properties of the organic interlayer and the structural asymmetry on the rectification are discussed.
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