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arXiv 2103.05153cond-mat.str-el
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人工合成反铁磁体中的强磁振子-磁振子耦合

Strong Magnon-Magnon Coupling in Synthetic Antiferromagnets

Changting Dai, Fusheng Ma

摘要:

合成反铁磁材料由两个铁磁层和一个非磁性层组成,具有两种均匀的旋进共振模式:同相声学模式和异相光学模式。在这项工作中,我们从理论和数值上证明了声光磁振子模之间的强耦合。这种强耦合归因于系统的对称性破缺,这可以通过倾斜偏置场或构造非对称合成反铁磁体来实现。研究发现,通过调节偏置场的倾斜角、反铁磁层间交换耦合的大小以及铁磁层的厚度,可以很好地调节耦合强度。此外,声光磁振子模之间的耦合甚至可以达到超强耦合区。我们的研究结果显示出很高的承诺,研究量子现象与磁振子平台。

英文摘要:

Synthetic antiferromagnet, comprised of two ferromagnetic layers separated by a non-magnetic layer, possesses two uniform precession resonance modes: in-phase acoustic mode and out-of-phase optic mode. In this work, we theoretically and numerically demonstrated the strong coupling between acoustic and optic magnon modes. The strong coupling is attributed to the symmetry breaking of the system, which can be realized by tilting the bias field or constructing an asymmetrical synthetic antiferromagnet. It is found that the coupling strength can be highly adjusted by tuning the tilting angle of bias field, the magnitude of antiferromagnetic interlayer exchange coupling, and the thicknesses of ferromagnetic layers. Furthermore, the coupling between acoustic and optic magnon modes can even reach the ultrastrong coupling regime. Our findings show high promise for investigating quantum phenomenon with a magnonic platform.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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