Spin wave resonance frequency in bilayer ferromagnetic films with the biquadratic exchange interaction
作者机构：Inner Mongolia Univ Inner Mongolia Key Lab Nanosci & Nanotechnol Hohhot 010021 Peoples R China Inner Mongolia Univ Sch Phys Sci & Technol Hohhot 010021 Peoples R China Inner Mongolia Normal Univ Coll Phys & Elect Informat Hohhot 010022 Peoples R China Inner Mongolia Agr Univ Coll Sci Hohhot 010018 Peoples R China
出 版 物：《CHINESE PHYSICS B》 (中国物理B（英文版）)
年 卷 期：2024年第33卷第9期
页 面：607-613页
核心收录：
基 金：Natural Science Foundation of Inner Mongolia of China [2019MS01021] Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region, China [NJZY21454] Theoretical Physics Discipline Development and Communication Platform of Inner Mongolia University
主 题：spin wave resonance frequency biquadratic exchange interaction interface exchange coupling surface anisotropy 76.50.+g 75.70.-i *** THIN-FILM MAGNETIZATION FIELD MODEL
摘 要：The dependences of spin wave resonance (SWR) frequency on the surface anisotropy field, interface exchange coupling, symmetry, biquadratic exchange (BQE) interaction, film thickness, and the external magnetic field in bilayer ferromagnetic films are theoretically analyzed by employing the linear spin wave approximation and Green s function method. A remarkable increase of SWR frequency, except for energetically lower two modes, can be obtained in our model that takes the BQE interaction into account. Again, the effect of the external magnetic field on SWR frequency can be increased by increasing the biquadratic to interlayer exchange ratio. It has been identified that the BQE interaction is of utmost importance in improving the SWR frequency of the bilayer ferromagnetic films. In addition, for bilayer ferromagnetic films, the frequency gap between the energetically highest mode and lowest mode is found to increase by increasing the biquadratic to interlayer exchange ratio and film thickness and destroying the symmetry of the system. These results can be used to improve the understanding of magnetic properties in bilayer ferromagnetic films and thus may have prominent implications for future magnetic devices.
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