Self-Hybridization and Tunable Magnon-Magnon Coupling in van der Waals Synthetic Magnets
Self-Hybridization and Tunable Magnon-Magnon Coupling in van der Waals Synthetic Magnets
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DOI：
10.1103/physrevapplied.15.044008
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发表时间：
2020-08
期刊：
影响因子：
--
通讯作者：
J. Sklenar;Wei Zhang
中科院分区：
文献类型：
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作者：
J. Sklenar;Wei Zhang
范德华磁体处于二维材料、反铁磁自旋电子学和磁振子学之间的交叉点，具有独特的地位。这些材料中的层间交换相互作用使得能够在 GHz 频率下获得反铁磁共振。因此，这些层状反铁磁体是一种有趣的材料，可以用它们来制作量子混合磁子器件。在这里，我们使用改进的宏观自旋模型和微磁模拟来演示范德华磁体在超薄（单层）极限附近的全面反铁磁共振谱。人们发现光学和声学磁振子模式的数量以及模式频率对层数非常敏感。我们发现了一种自杂交效应，其中成对的光学或声学磁振子通过动态交换相互作用相互作用和自杂交。这导致能谱中特征性的避免能级交叉。通过模拟，我们表明，通过电控制异质结构内表面层的阻尼，可以控制磁振子谱中避免的能级交叉的强度和数量。
Van der Waals magnets are uniquely positioned at the intersection between two-dimensional materials, antiferromagnetic spintronics, and magnonics. The interlayer exchange interaction in these materials enables antiferromagnetic resonances to be accessed at GHz frequencies. Consequently, these layered antiferromagnets are intriguing materials out of which quantum hybrid magnonic devices can be fashioned. Here, we use both a modified macrospin model and micromagnetic simulations to demonstrate a comprehensive antiferromagnetic resonance spectra in van der Waals magnets near the ultrathin (monolayer) limit. The number of optical and acoustic magnon modes, as well as the mode frequencies, are found to be exquisitely sensitive to the number of layers. We discover a self-hybridization effect where pairs of either optical or acoustic magnons are found to interact and self-hybridize through the dynamic exchange interaction. This leads to characteristic avoided energy level crossings in the energy spectra. Through simulations, we show that by electrically controlling the damping of surface layers within heterostructures both the strength and number of avoided energy level crossings in the magnon spectra can be controlled.