College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China.
College of Physics, Jilin Normal University, Siping 136000, People's Republic of China.
J Phys Condens Matter. 2023 Jul 6;35(40). doi: 10.1088/1361-648X/ace1be.
In layered antiferromagnetic material CrCl, due to the antiferromagnetic coupling between two magnetic sublattices, there are two antiferromagnetic resonance modes, called acoustic mode with in-phase precession and optical mode with out-of-phase precession. By using Landau-Lifshitz-Gilbert equation, we study the magnetization dynamics of the two sublattices in CrCl. A coupling resonance mode appears at the coupling point when the acoustic and optical magnon modes are tuned by an applied magnetic field, which is called 'coupling mode'. In this paper, we present an explanation for the coupling of the acoustic and the optical mode. Our calculation shows that the coupling of the acoustic and optical mode is accomplished by change of the precession phase-difference between two magnetic sublattices.
在层状反铁磁材料 CrCl 中，由于两个磁子晶格之间的反铁磁耦合，存在两种反铁磁共振模式，分别称为同相进动的声学模式和异相进动的光学模式。通过使用朗道-利夫希茨-吉尔伯特方程，我们研究了 CrCl 中两个子晶格的磁化动力学。当通过外加磁场调谐声学和光学磁子模式时，在耦合点出现一个耦合共振模式，称为“耦合模式”。本文给出了对声学和光学模式耦合的解释。我们的计算表明，通过改变两个磁子晶格之间的进动相位差来实现声学和光学模式的耦合。
