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基于自由电子模型,考虑到不同膜厚和不同磁化排列的费密能的不同,自洽地给出费密能。利用这种方法,计算了材料铁磁层和非磁层电子密度对层间耦合振荡周期的影响,并比较了我们所得结果与他人按巨势法得到的结果的异同,发现振荡周期随着电子密度的变化而改变,并且当铁磁层和非磁层的电子密度不同时,将出现不等周期的振荡。这一新的理论结果与最近的实验相符。此外,还计算了极化强度和由于能带不匹配造成的接触势对耦合强度及振荡相位的影响:前者是决定耦合强度的主要因素,后者则会影响振荡相位,甚至周期。
Based on the free electron model, Fermi energy is given in a consistent manner considering the difference in Fermi density with different film thicknesses and different magnetization arrangements. Using this method, the influence of the electron density of the ferromagnetic layer and the non-magnetic layer on the period of the coupled-coupled oscillation is calculated and the similarities and differences between our results and those obtained by others are compared. It is found that the oscillation period varies with the electron Density changes, and when the ferromagnetic layer and the non-magnetic layer electron density is different, there will be unequal-period oscillation. This new theoretical result is in line with recent experiments. In addition, the influence of the polarization intensity and the contact potential due to the band mismatch on the coupling strength and the oscillation phase are also calculated. The former is the main factor that determines the coupling strength, and the latter affects the oscillation phase and even the period.