论文标题
范德华合成磁铁中的自杂交和可调节磁岩耦合
Self-hybridization and tunable magnon-magnon coupling in van der Waals synthetic magnets
论文作者
论文摘要
范德华磁铁位于二维材料，抗磁性旋转型和镁之间的交集。这些材料中的层间交换相互作用可在GHz频率下访问抗铁磁共振。因此，这些分层的抗铁磁铁是有趣的材料，可以制作量子混合型镁质设备。在这里，我们同时使用改良的Macrospin模型和微磁模拟来证明在Ultrathin（单层）极限附近的Van der waals磁铁中的全面抗铁磁共振光谱。发现光学和声学镁模式以及模式频率的数量对层的数量非常敏感。我们发现了一种自杂交效应，其中发现了通过动态交换相互作用对成对的光学或声学镁对进行相互作用和自杂交。这导致了能量光谱中特征性避免的能级交叉。通过模拟，我们表明，通过电气控制异质结构中的表面层阻尼，可以控制磁化光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.
