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首页> 外文期刊>Physical review >Three-dimensional Micromagnetic Simulations Of Multidomain Bubble-state Excitation Spectrumin Ferromagnetic Cylindrical Nanodots
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Three-dimensional Micromagnetic Simulations Of Multidomain Bubble-state Excitation Spectrumin Ferromagnetic Cylindrical Nanodots

机译：铁磁圆柱纳米点多域气泡态激发谱的三维微磁模拟

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摘要

The excitation spectrum of multidomain bubble states in cylindrical nanodots with a large perpendicular anisotropy has been investigated by means of three-dimensional micromagnetic simulations for various dot diameters. In a first step, the evolution of the zero-field susceptibility spectra as a function of the dot diameter is studied for bidomain bubble states. Increasing dot diameter leads to shifts of the resonance frequencies toward the low frequencies for the fundamental domain wall and domain modes, whereas the spectral positions of surface domain wall and domain modes are weakly affected. Second, the high-frequency response of a tridomain bubble state stabilized in larger dot diameters is analyzed. Dynamic interaction effects are revealed mainly through the identification of coupled domain-wall modes, the resonance frequencies of which depend on the relative domain-wall chiralities. Lastly, the magnetization dynamics of a metastable bidomain bubble state with a pair of vertical Bloch lines, each of them possessing a Bloch point, is addressed. In such a case, the presence of magnetic singularities leads to a splitting of the fundamental domain-wall mode into two resonance lines assigned to oscillations of domain-wall parts with different phase relations.
机译：通过三维微磁模拟，对不同直径的点，研究了具有较大垂直各向异性的圆柱形纳米点中多畴气泡态的激发光谱。第一步，研究了双畴气泡状态下零场磁化率谱随点直径的变化。对于基本畴壁和畴模式，增加的点直径导致谐振频率向低频偏移，而对表面畴壁和畴模式的频谱位置的影响很小。其次，分析了在较大点直径下稳定的三畴气泡状态的高频响应。动态相互作用的影响主要是通过识别耦合的畴壁模式来揭示的，其共振频率取决于相对的畴壁手性。最后，讨论了具有一对垂直布洛赫线的亚稳态双畴气泡状态的磁化动力学，每条布洛赫线都具有布洛赫点。在这种情况下，磁性奇异点的存在导致基本的畴壁模式分裂为两条谐振线，分配给具有不同相位关系的畴壁部分的振荡。

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