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采用直流磁控溅射的方法在氧化镁(100)单晶基板上生长了一系列c轴垂直取向的FePt薄膜,通过改变沉积时的基板温度,薄膜从Fe,Pt原子无序排列的面心立方结构逐渐变化到有序排列的L10相面心四方结构.在此基础上,系统研究了FePt薄膜的化学有序度对磁和磁光性能的影响.随着有序度的增加,FePt薄膜的磁晶各向异性能,以及沿垂直方向的矫顽力、剩磁比均增加,在基板温度高于530℃时制备的薄膜中的磁晶各向异性能超过1J/cm3.同时,还观察到有序FePt合金薄膜的磁光克尔光谱(克尔转角的大小和极值所对应的跃迁光子能量)随化学有序度的显著变化.
A series of c-axis perpendicularly-oriented FePt films were grown on MgO (100) single crystal substrate by direct current magnetron sputtering. By changing the substrate temperature during deposition, the surface of the film was randomly arranged from Fe and Pt atoms The cubic structure changes gradually to the ordered arrangement of the L10-facet-tetragonal structure.On this basis, the influence of the chemical ordering of the FePt thin films on the magneto-magneto-magneto-optical properties has been studied systematically.As the degree of ordering increases, the FePt thin films , And the coercive force in the vertical direction, the remanence ratio is increased, and the magnetocrystalline anisotropy in the thin film prepared when the substrate temperature is higher than 530 ° C. exceeds 1 J / cm 3 The magneto-optical Kerr spectra (the transition photon energies corresponding to the Kerr angles and extremums) of ordered FePt alloy films were observed to change significantly with the degree of chemical order.