arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.04512cond-mat.mtrl-sci
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人工合成反铁磁体中的各向异性磁振子-磁振子耦合

Anisotropic magnon-magnon coupling in synthetic antiferromagnets

Wei He, Z. K. Xie, Rui Sun, Meng Yang, Yang Li, Xiao-Tian Zhao, Wei Liu, Z. D. Zhang, Jian-Wang Cai, Zhao-Hua Cheng, Jie Lu

摘要:

人工合成反铁磁体中的磁振子-磁振子耦合使得它可以作为混合磁振子系统来探索量子信息技术。为了诱导磁振子-磁振子耦合,需要打破两个磁化之间的宇称对称性。在这里,我们实验证明了一种方便的方法,打破宇称对称性的两个磁性层的不对称厚度,从而引入一个磁振子-磁振子耦合的Ir基合成反铁磁体CoFeB(10 nm)/Ir(tIr=0.6 nm,1.2 nm)/CoFeB(13 nm)。值得注意的是,我们发现弱单轴各向异性场(~ 20 Oe)使磁振子-磁振子耦合各向异性。由特征反交叉间隙呈现的耦合强度分别在0.54 GHz和0.90 GHz之间的tIr =0.6 nm的范围内变化,和在接近零到1.4 GHz之间的tIr = 1.2 nm的范围内变化。我们的研究结果表明,通过非对称结构诱导磁振子-磁振子耦合,并通过改变面内磁场的方向来调节耦合强度是可行的。在这种高度可调谐的材料系统中的磁振子-磁振子耦合可以为探索量子力学耦合现象打开令人兴奋的前景。

英文摘要:

The magnon-magnon coupling in synthetic antiferromagnets advances it as hybrid magnonic systems to explore the quantum information technologies. To induce the magnon-magnon coupling, the parity symmetry between two magnetization needs to be broken. Here we experimentally demonstrate a convenient method to break the parity symmetry by the asymmetric thickness of two magnetic layers and thus introduce a magnon-magnon coupling in Ir-based synthetic antiferromagnets CoFeB(10 nm)/Ir(tIr=0.6 nm, 1.2 nm)/CoFeB(13 nm). Remarkably, we find that the weakly uniaxial anisotropy field (~ 20 Oe) makes the magnon-magnon coupling anisotropic. The coupling strength presented by a characteristic anticrossing gap varies in the range between 0.54 GHz and 0.90 GHz for tIr =0.6 nm, and between nearly zero to 1.4 GHz for tIr = 1.2 nm, respectively. Our results demonstrate a feasible way to induce the magnon-magnon coupling by an asymmetric structure and tune the coupling strength by varying the direction of in-plane magnetic field. The magnon-magnon coupling in this highly tunable material system could open exciting perspectives for exploring quantum-mechanical coupling phenomena.

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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