Voltage controlled nonlinear spin filter based on paramagnetic ion doped nanocrystal

摘要

This invention pertains to a device and a method for injecting spin polarized monochromatic electrons with a particular magnetic moment at room temperature and in absence of an external magnetic field into a nonmagnetic electrode. The device comprises a ferromagnetic electrode, a nonmagnetic electrode spaced from the ferromagnetic electrode, a nanocrystal doped with a single active paramagnetic ion disposed in the space between the electrodes, and an electrical connection between the electrodes for applying voltage to move the electrons from the ferromagnetic electrode, through the doped nanocrstal and into the nonmagnetic electrode. The method comprising the step of applying voltage between spaced ferromagnetic and nonmagnetic electrodes whereby spin polarized electrons are passed from the ferromagnetic electrode through a doped nanocrystal that is spaced from the ferromagnetic electrode and is in contact with the nonmagnetic electrode, and into the nonmagnetic electrode, the nanocrystal being doped with a single paramagnetic ion.