Hybridized magnon modes in the quenched skyrmion crystal

Hybridized magnon modes in the quenched skyrmion crystal
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淬火斯格明子晶体中的杂化磁振子模式

DOI:
10.1103/physrevb.104.144410
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
S. Seki
S. Seki
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
R. Takagi;M. Garst;J. Sahliger;C. H. Back;Y. Tokura;S. Seki

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磁性斯格明子因其具有非平凡拓扑的粒子状旋转自旋纹理而引起了人们的关注,并且它们的自组装周期顺序,即斯格明子晶体(SkX)预计具有独特的磁波特性。在本文中,我们研究了淬灭SkX状态下的磁共振,这是通过快速冷却手性磁绝缘体中的高温平衡SkX相而获得的。在低温下,识别出斯格明子的六极和八极激发模式,它们通常对于GHz范围频率的振荡磁场不活跃,但通过与活跃的逆时针模式和呼吸模式的杂交可分别检测到。理论计算很好地再现了观察到的磁激发光谱,这表明在低温下增强的有效磁各向异性是观察到活性和非活性模式之间杂化的关键。
Magnetic skyrmions have attracted attention as particlelike swirling spin textures with nontrivial topology, and their self-assembled periodic order i.e., the skyrmion crystal (SkX) is anticipated to host unique magnonic properties. In this paper, we investigate magnetic resonance in the quenched SkX state, which is obtained by the rapid cooling of the high-temperature equilibrium SkX phase in the chiral magnetic insulator. At low temperatures, sextupole and octupole excitation modes of skyrmions are identified, which are usually inactive for oscillating magnetic fieldswith GHz-range frequencybut turn out to be detectable through the hybridization with the-active counterclockwise and breathing modes, respectively. The observed magnetic excitation spectra are well reproduced by theoretical calculations, which demonstrates that the effective magnetic anisotropy enhanced at low temperatures is the key for the observed hybridization between the-active and-inactive modes.
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