title: Spin-current rectification in an organic magnetic/nonmagnetic device.
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.
authors.affiliation: School of Physics, Shandong University, Jinan 250100, China.
authors.forename: Guichao
authors.initials: G
authors.lastname: Hu
authors.forename: Keliang
authors.initials: K
authors.lastname: He
authors.forename: Shijie
authors.initials: S
authors.lastname: Xie
authors.forename: Avadh
authors.initials: A
authors.lastname: Saxena