Microwave absorption in the frustrated ferrimagnet Cu2OSeO3
Microwave absorption in the frustrated ferrimagnet Cu2OSeO3
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受抑亚铁磁体 Cu2OSeO3 中的微波吸收
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
H. Berger
中科院分区：
文献类型：
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作者：
M. Kobets;K. Dergachev;E. Khatsko;A. Rykova;P. Lemmens;D. Wulferding;H. Berger
在液氦温度下，研究了一种新的Cu_2OSeO_3铁磁体在宽频率范围（17-142 GHz）内的共振特性。共振数据被用来绘制频率场曲线的铁磁谱中描述的各向异性的两个子晶格亚铁磁体的模型。估计了自旋波谱中对应于差距的有效磁各向异性（3 GHz）。结果表明，由于磁化旋进类型的多样性，该谱具有多分量结构。随着高频磁场的振幅增加，在主共振场以下的外部磁场中观察到额外的吸收。检测到的附加吸收对应于由于亚铁磁晶体Cu 2 OSeO 3中的磁结构的不均匀性而引起的不均匀非线性参数共振。
The resonance properties of a new Cu2OSeO3 ferrimagnet have been investigated in a wide range of frequencies (17-142 GHz) at liquid helium temperature. The resonance data were used to plot the frequency-field curve of the ferromagnetic spectrum described in the model of an anisotropic two-sublattice ferrimagnet. The effective magnetic anisotropy corresponding to the gap in the spin wave spectrum was estimated (3 GHz). It was found that the spectrum has a multicomponent structure due to the diversity of the types of magnetization precession. As the amplitude of the high-frequency magnetic field increased, additional absorption was observed in an external magnetic field below the main resonance field. The addition absorption detected corresponds to a nonuniform nonlinear parametric resonance due to the nonuniformity of the magnetic structure in the ferrimagnetic crystal Cu2OSeO3.