We fabricated the Fe₃O₄/alkyl-sulfonic acid molecules hybrid nanoparticles by self-assembly monolayers (SAMs) in air and nitrogen ambience to investigate the impact of the oxidation on the spin transport. X-ray photoelectron spectra (XPS) and Fourier transform infrared (FTIR) spectroscopy measurements infer that the chemical bonding between Fe₃O₄ and alkyl-sulfonic acid remains unchanged as interfacial oxygen content reduced. The resistivity of nitrogen ambience synthesized sample is 1/3 of that in air indicates more tunneling channels are active in less oxygen content samples. The stable and robust room temperature tunnel magnetoresistances up to ∼10% is observed for both ambience fabrication samples, demonstrating that the magnetoresistance in Fe₃O₄/sulfonic acid nanoparticles is not sensitive to the oxygen. These provide Fe₃O₄/molecule interface as a promising candidate for spintronic applications.

我们通过自组装单分子膜（SAMs）在空气和氮气环境中制备了Fe ₃ O ₄ /烷基磺酸分子杂化纳米颗粒，以研究氧化对自旋运输的影响。X射线光电子能谱（XPS）和傅立叶变换红外（FTIR）光谱测量可推断Fe ₃ O ₄之间的化学键随着界面含氧量的减少，烷基磺酸保持不变。氮环境合成样品的电阻率为空气中电阻率的1/3，这表明在较少氧气含量的样品中有更多的隧穿通道处于活动状态。在两个环境制备样品中均观察到高达约10％的稳定而稳定的室温隧道磁阻，这表明Fe ₃ O ₄ /磺酸纳米粒子中的磁阻对氧不敏感。这些提供Fe ₃ O ₄ /分子界面作为自旋电子学应用的有前途的候选者。