Electric-Field Control of Magnon Gaps in a Ferromagnet using a Spatially-Periodic Electric Field
Electric-Field Control of Magnon Gaps in a Ferromagnet using a Spatially-Periodic Electric Field
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DOI：
10.1142/s2010324717400124
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
Glade Sietsema;Tian-shi Liu;M. Flatté
中科院分区：
文献类型：
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作者：
Glade Sietsema;Tian-shi Liu;M. Flatté
利用Landau-Lifshitz-Gilbert方程，计算了磁性材料一维（1D）和二维（2D）周期超晶格中自旋波的频率和线宽。推导了磁性材料之间无表面力矩边界的交换场形式，并确定了在整个超晶格布里渊区产生磁谱间隙的磁性材料组合。研究了均匀磁性材料在周期性电场作用下的磁振子间隙和自旋波色散特性。这些结果表明磁绝缘体在自旋波传播特性的电场控制中的应用。
The frequencies and linewidths of spin waves in one-dimensional (1D) and two-dimensional (2D) periodic superlattices of magnetic materials are found, using the Landau–Lifshitz–Gilbert equations. The form of the exchange field from a surface-torque-free boundary between magnetic materials is derived, and magnetic-material combinations are identified which produce gaps in the magnonic spectrum across the entire superlattice Brillouin zone for hexagonal and square-symmetry superlattices. The magnon gaps and spin-wave dispersion properties of a uniform magnetic material under the influence of a periodic electric field are presented. Such results suggest the utility of magnetic insulators for electric-field control of spin-wave propagation properties.