| Conjugated polymer exhibited lots of advantaged properties compared with inorganic materials, which shows great prospect in application and theory research. With the in-depth study of polymer material, researcher discovered many new features of this material, such as room-temperature ferromagnetism. The research of organic ferromagnetic material made many important advances since the first time people discovered ferromagnetic polymer, but we still have many problems to totally understand the origin of magnetic in organic ferromagnetic material, and in order to meet the application requirement in the future, we also need to do more research about ferromagnetic polymer. The major work in this thesis is doing research about the magnetic property of ferromagnetic polymer material and take advantage of high magnetic field(HMF) to control the growth of ferromagnetic polymer film. In addition, conjugated polymer have weak spin-orbit interaction and weak hyperfine interaction, which makes conjugated polymer be potential candidates for the spin-polarized transport, and play an important role in organic spintronics research. So we also do some exploring about the spin property of conjugated polymer P(NDI2OD-T2). And we achieve some findings in the following aspects:1, We Manufactured a kind of ferromagnetic polymer material: poly-(3-hexylthiophene)(P3HT):fullerenes(C6o) blend film, we measured the magnetic properties of P3HT:C6o blend film and High-purity P3HT and C6o powder by superconducting quantum interface device(SQUID). The result shows that the saturation magnetization of P3HT:C6o blend film in room temperature is 0.5 emu/cm3, and there is no magnetic property in P3HT and C6o powder, so that we can conclude that the magnetic of P3HT:C6o blend film comes from the charge transfer from P3HT to C6o. The UV-visible spectroscopy and X-ray diffraction of P3HT:C6o blend film suggested that the crystallization of P3HT film is a crucial reason for the ferromagnetism of P3HT:C6o blend film.2, We take advantage of 8T high magnetic field to control the growth of P3HT:C6o blend film, in this work, the P3HT and C6o blend film were prepared by drop casting processing under high magnetic field, and the influence of HMF on magnetism of the resultant films was studied by the superconducting quantum interfere device measurement electronic spin resonance spectroscopy and Magnetic Force Microscope, the result shows that the room-temperature ferromagnetism of the P3HT:C60 blend film prepared under HMF enhanced very obviously, the room temperature saturation magnetization increased more than an order compared with the samples prepared without HMF, and Curie temperature of the sample is above 400 k. The microstructure of P3HT:C60 blend film prepared under high magnetic field was characterized by UV-visible spectroscopy and X-ray diffraction pattern, the film micro-structural characterizations revealed an enhancement of the order of inter-chain packing as well as the crystallization of the P3HT nano-domains within the P3HT:C60 blends by the HMF-induced growth, which will facilitate charge transfer at the interface of P3HT and C60 nano-domains, therefore could contribute significantly to the improvement of ferromagnetism of P3HT:C60 films.3, We observed inverse spin Hall effect(ISHE) in the experiment by using Ni8oFe2o/Pt metal film, and explored spin transport property of P(NDI2OD-T2) by take advantage of spin pumping and ISHE. The result of spin resonance spectroscopy measurement shows that ISHE also exist in P(NDI2OD-T2), and P(NDI2OD-T2) has the long spin relaxation length and it was a excellent spin-polarized transported material. |
