湿化学法合成高矫顽力FeCo纳米线及其磁性能

Synthesis of FeCo nanowires with high coercivity by a wet chemical method and their magnetic properties

FeCo纳米材料具有高的饱和磁化强度和较大的磁导率,具有广阔的应用前景。但如何制备出高磁晶各向异性能的FeCo纳米材料,一直是该领域的难点。研究表明,各向异性的一维纳米线可以提高材料的磁性能。因此提出一种简便的湿化学法,通过溶剂十六胺以及表面活性剂油胺和油酸的配合、诱导,直接合成一维的FeCo纳米线。借助形状各向异性增强了FeCo相的磁晶各向异性,成功制备出具有较高矫顽力的FeCo纳米线。调节反应温度可对FeCo纳米材料的形貌和磁性能进行调控,在反应温度为280℃时,获得了分散均匀的一维FeCo纳米线。该纳米线的矫顽力Hc高达1 092 Oe,饱和磁化强度Ms为113 emu/g。为可控制备具有高矫顽力的一维FeCo纳米材料提供了新的路线和实验依据。

FeCo nanomaterials have broad application prospects because of their high saturation magnetization and large magnetic permeability. However, how to synthesize FeCo nanomaterials with high magnetocrystalline anisotropy energy is still keeping a challenge. Theoretical calculation showed that anisotropic one-dimensional nanowires can improve the magnetic properties of materials. Therefore, a novel wet chemical method is proposed to directly synthesize one-dimensional FeCo nanowires. This method employed amino group, such as solvent hexanamine and surfactant oleamine, to induce anisotropy growth of FeCo nanowires. The magnetocrystalline anisotropy of the FeCo phase was enhanced by shape anisotropy, and FeCo nanowires with high coercivity were successfully synthesized. The morphology and magnetic properties of FeCo nanomaterials can be regulated by adjusting the reaction temperature. The one-dimensional FeCo nanowires with uniform dispersion were obtained at the reaction temperature of 280 ℃. The coercivity Hcof the nanowires is as high as 1 092 Oe, and the saturation magnetization Msis 113 emu/g. A new route and experimental basis is provided for the controllable preparation of one-dimensional FeCo nanomaterials with high coercivity.