Demagnetizing factors in patterned CoNiFe films with rectangular elements

CoNiFe patterned films with rectangular elements, all 600-nm wide but of different lengths, were fabricated and investigated by ferromagnetic resonance experiment and micromagnetic simulation. An in-plane magnetic uniaxial anisotropy was exhibited, and its value increases with the increase of the aspect ratio of the elements, which was fitted by the model, including a quasi-ellipsoid demagnetizing field and a non-uniform demagnetizing field. The relative importance of the nonuniform demagnetizing field decreased from 0.26 to 0.16 with the increase of the length-width aspect ratio of the patterned element from 1.5 to 10. The demagnetizing factors in the three principal axes were determined from the experimental data of ferromagnetic resonance, which agreed reasonably well with the values calculated by micromagnetic simulation. The calculation also indicated that the interaction between elements could be neglected when the edge-to-edge spacing between neighboring elements was larger than 3 μm in our patterned films.     

受迫振动实验数据处理方案的探讨

本文修改了现行教学用网络数据处理系统中的幅频特性描述和求解阻尼系数的方法,采用非线性拟合,不仅能直观描述蜗卷弹簧性能的差异,同时可以从拟合曲线中方便地求解实验的阻尼系数.这是一种实时的数据处理方式,研究结果可成为仪器生产单位数据处理软件的开发方案,为实验室教师机上显示各组仪器的特性曲线和求解阻尼系数提供了一种更直接的方式.     

受迫振动实验数据处理方案的探讨

修改了现行教学用网络数据处理系统中的幅频特性描述和求解阻尼系数的方法,采用非线性拟合,不仅能直观描述蜗卷弹簧性能的差异,同时可以从拟合曲线中方便地求解实验的阻尼系数。这是一种实时的数据处理方式,研究结果可成为仪器生产单位数据处理软件的开发方案,为实验室教师机上显示各组仪器的特性曲线和求解阻尼系数提供了一种更直接的方式。