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arXiv 1902.09186cond-mat.mes-hall
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按需磁振子晶体中磁弹相互作用的驱动磁化动力学

Driving magnetization dynamics in an on-demand magnonic crystal by magneto-elastic interaction

C. L. Chang, S. Mieszczak, M. Zelent, V. Besse, U. Martens, R. R. Tamming, J. Janusonis, P. Graczyk, M. Münzenberg, J. W. Kłos, R. I. Tobey

摘要:

利用超快激光脉冲的空间光干涉,我们在均匀磁化的薄膜的磁化分布中产生横向调制,其磁激发光谱通过与弹性波的相干和共振相互作用来监测。我们发现一个不寻常的依赖性的磁弹性耦合作为外部施加的磁场是角度和磁场调谐相对于磁化调制的波矢量,这可以解释的空间不均匀的自旋波模式的出现。在这方面,空间光干涉方法可以被看作是用户可配置的、时间窗口化的、按需的磁振子晶体,可能具有任意二维形状,其允许控制和选择性地控制自旋波的空间分布。使用各种方法计算自旋波,这里使用平面波方法和微磁模拟,可以确定每个激发的空间分布和相关的能量尺度,这为我们选择的弹性波激发之外的许多激发方法打开了大门。

英文摘要:

Using spatial light interference of ultrafast laser pulses, we generate a lateral modulation in the magnetization profile of an otherwise uniformly magnetized film, whose magnetic excitation spectrum is monitored via the coherent and resonant interaction with elastic waves. We find an unusual dependence of the magnetoelastic coupling as the externally applied magnetic field is angle- and field-tuned relative to the wave vector of the magnetization modulation, which can be explained by the emergence of spatially inhomogeneous spin-wave modes. In this regard, the spatial light interference methodology can be seen as a user-configurable, temporally windowed, on-demand magnonic crystal, potentially of arbitrary two-dimensional shape, which allows control and selectivity of the spatial distribution of spin waves. Calculations of spin waves using a variety of methods, demonstrated here using the plane-wave method and micromagnetic simulation, can identify the spatial distribution and associated energy scales of each excitation, which opens the door to a number of excitation methodologies beyond our chosen elastic wave excitation.

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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