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arXiv 2103.14524cond-mat.mes-hallcond-mat.mtrl-scicond-mat.other
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薄膜多层膜中磁性skyrmions的微波共振

Microwave resonances of magnetic skyrmions in thin film multilayers

Bhartendu Satywali, Volodymyr P. Kravchuk, Liqing Pan, M. Raju, Shikun He, Fusheng Ma, A. P. Petrović, Markus Garst, Christos Panagopoulos

摘要:

非共线磁体在微波频率下表现出丰富的动态特性。它们可以拥有被称为skyrmions的纳米级拓扑结构,其自旋共振预计对其局部磁环境高度敏感。在这里,我们报告的[Ir/Fe/Co/Pt]多层托管Néel skyrmions在室温下的磁共振研究。实验揭示了两个不同的共振skyrmion相位在面内交流激励,频率在6-12 GHz之间。互补微磁学模拟表明,净磁偶极矩逆时针(CCW)旋转在两个共振。低频共振的磁振子概率分布局限于孤立的skyrmions内,不像高频模式主要起源于skyrmions之间的区域。然而,这两种模式的属性敏感地依赖于面外偶极耦合,这是通过在我们的异质结构的铁磁层间距控制。在这个室温研究中报道的稳定孤立skyrmion的回旋鼓励新的材料平台和应用的基础上skyrmion共振的发展。此外,我们的材料结构能够调谐谐振光谱,从而在宽带频率范围内扩展此类应用的功能。

英文摘要:

Non-collinear magnets exhibit a rich array of dynamic properties at microwave frequencies. They can host nanometre-scale topological textures known as skyrmions, whose spin resonances are expected to be highly sensitive to their local magnetic environment. Here, we report a magnetic resonance study of an [Ir/Fe/Co/Pt] multilayer hosting Néel skyrmions at room temperature. Experiments reveal two distinct resonances of the skyrmion phase during in-plane ac excitation, with frequencies between 6-12 GHz. Complementary micromagnetic simulations indicate that the net magnetic dipole moment rotates counterclockwise (CCW) during both resonances. The magnon probability distribution for the lower-frequency resonance is localised within isolated skyrmions, unlike the higher-frequency mode which principally originates from areas between skyrmions. However, the properties of both modes depend sensitively on the out-of-plane dipolar coupling, which is controlled via the ferromagnetic layer spacing in our heterostructures. The gyrations of stable isolated skyrmions reported in this room temperature study encourage the development of new material platforms and applications based on skyrmion resonances. Moreover, our material architecture enables the resonance spectra to be tuned, thus extending the functionality of such applications over a broadband frequency range.

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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