It is studies the oscillatory exchange coupling and its dependence on magnetic-layer thickness from quantum electronics theory and first principles for (100) and (110) oriented Co/Cu/Co sandwiches. The results of the calculations show that the change of the magnetic layer thickness can lead to a strong redistribution of weight between the different characteristic oscillations in the coupling energy, while the corresponding periods are unchanged. The electron structure will changing while thickness of the magnetic layer change. For thicker layers we find exchange coupling only small oscillations around an asymptotic value. The calculated exchange coupling energies is not only the periods but also the amplitudes and the phases of the oscillations are correctly accordance with existing experiment also the theories of Barnas and Bruno.%应用量子干涉理论和第一性原理研究了Co/Cu/Co夹层结构在[100]和[110]取向上振荡交换耦合及对磁层厚度的依赖,对夹层交换耦合振荡的计算结果表明:当相应的周期不变时,磁性层(Co)厚度的变化将导致在不同的RKKY振荡特征中势的再分配,磁层厚度发生变化时,磁性层上电子结构也发生变化,当磁性层较厚时,交换耦合仅在某一渐近值附近有一小的振荡.耦合振荡的周期、振幅和相位的测量与实验相一致,也与Barnas和Bruno理论吻合.
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