Organic spintronics focuses on utilizing the spin degree of freedom in organic materials because of the long spin relaxation time. The vertical organic spin valve (OSV) is a typical sample structure used to study the spin transport phenomena. However, the fabrication of high quality OSVs is difficult, which results in controversial experiment results and hence hinders the development of organic spintronics. In this work, we describe our recent study on the fabrication of typical vertical organic spin valves, La 0.67 Sr 0.33 MnO 3 (LSMO)/Alq 3 /Co. The LSMO bottom electrodes are annealed to obtain an atomically smooth surface and improved magnetic properties. The top Co electrodes are deposited by an indirect deposition method to reduce the interfusion between Co and Alq 3 . The controlled fabrication process provides much better performance and sample yield of OSVs.

The magnetic properties investigated by experiment on the Ni/NiO interface of Ni/NiO multi-thin layers and surface-NiO-coated Ni ultra fine particles are reported. At temperatures below 80 K, an abnormal enhanced magnetization under external magnetic field (H = 40kOe) was found. The enhanced magnetization decreases quickly with temperature increasing.The high field (5-65 kOe) magnetization (approching to saturation) of ultrafine particles and multi-thin layers were also measured. The fit results for experimental data indicate that the interface Ni/NiO in Ni/NiO UFP and Ni/NiO ML have inhomogenous spin structure.

The Faraday rotation caused by electronic transitions between the 4f and 5d states of Ce3+ ions in paramagnetic CeF3 crystals is calculated. The crystal field is an important perturbation on the energy levels. An external magnetic field, together with an additive magnetic field introduced phenomenologically in our paper, would spilt every 4f state into two sublevels. The dipole transitions between these sublevels, and 5d states induce the Faradap effect.The Verdet constant at 0.6328 μm in the temperature range of 60-300 K is obtained. It is shown that our calculation is in good agreement with experiment.