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Spin-wave resonance frequency in ferromagnetic thin film with the next nearest neighbor interaction
Physica B: Condensed Matter ( IF 2.8 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.physb.2021.412828
Ruijiao Ma , Shuhui Zhang , Jianhong Rong , Guohong Yun , Lingbo Bao , Yu Liang , Robert Bauer , Juyuan Zhen , Gap Soo Chang

Linear spin-wave approximation and Green's function were used to study the dependence of spin wave resonance (SWR) frequency in a ferromagnetic film considering the external magnetic field, surface anisotropy, number of atomic layers, nearest and next nearest neighbor interaction. A systematic study of the SWR frequency as a function of external magnetic field, surface anisotropy, and next nearest neighbor interaction was performed. It demonstrates that the next nearest neighbor interaction affects strongly on the SWR frequencies of energetically higher modes, as well as the gap of resonance frequency between the highest and lowest energy modes is broaden as the next nearest neighbor interaction increasing. Moreover, we show that SWR frequencies at two higher energy modes are coincided when the surface anisotropy increases. Finally, as the thickness of film decreases, SWR frequency of the lowest energy mode is shifted to higher value. Thus, considering these effects in an opportune way, we are able to control the SWR frequency of the system.



中文翻译:

具有次近邻相互作用的铁磁薄膜中的自旋波共振频率

考虑外部磁场,表面各向异性,原子层数,最近和下一个最近邻相互作用,使用线性自旋波近似和格林函数研究铁磁膜中自旋波共振(SWR)频率的依赖性。对SWR频率作为外部磁场,表面各向异性和下一个最近邻相互作用的函数进行了系统研究。它表明,下一个最邻近的相互作用对能量较高模式的SWR频率有强烈的影响,并且随着下一个最邻近的相互作用的增加,最高和最低能量模之间的共振频率的差距变大。此外,我们表明,当表面各向异性增加时,两个较高能量模式下的SWR频率一致。最后,随着膜厚度的减小,最低能量模式的SWR频率将移至更高的值。因此,以适当的方式考虑这些影响,我们能够控制系统的SWR频率。

更新日期:2021-01-13
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