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利用超高真空磁控溅射方法制备了一系列不同C层厚度的C/FePt/Fe纳米薄膜,然后进行原位高温退火。应用X射线衍射仪(XRD)分析了样品的晶体结构,利用扫描探针显微镜(SPM)观测了表面形貌和磁畴结构,通过振动样品磁强计(VSM)测量了磁性。结果表明,薄膜的微结构和磁特性随C覆盖层厚度的变化有着非常显著的变化。C的加入使样品表面更加光滑,使10 nm厚的C覆盖层样品获得了0.3 nm的粗糙度和3.8 nm的颗粒尺寸。C覆盖层减弱了磁性颗粒间的磁偶极作用,同时减弱了磁性颗粒间的交换耦合作用,提高了L10织构的有序化程度,进而增大了样品的矫顽力,矫顽力达到了987 kA/m。
A series of C / FePt / Fe nanocrystalline films with different C-layer thicknesses were fabricated by ultra-high vacuum magnetron sputtering and then annealed in-situ at high temperature. The crystal structure of the sample was analyzed by X-ray diffraction (XRD). The surface morphology and magnetic domain structure were observed by scanning probe microscopy (SPM). The magnetic properties were measured by vibrating sample magnetometer (VSM). The results show that the microstructure and magnetic properties of the films vary greatly with the thickness of the C cap layer. The addition of C smoothes the surface of the sample, resulting in a 0.3 nm roughness and a 3.8 nm particle size for a 10 nm thick C cladding sample. C overlay weakens the magnetic dipole interaction between the magnetic particles and weakens the exchange coupling between the magnetic particles and improves the ordering of the L10 texture and further increases the coercivity of the sample and the coercivity reaches 987 kA / m.