Emergent Dynamics of Artificial Spin-Ice Lattice Based on an Ultrathin Ferromagnet
Emergent Dynamics of Artificial Spin-Ice Lattice Based on an Ultrathin Ferromagnet
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基于超薄铁磁体的人工自旋冰晶格的涌现动力学
DOI：
10.1021/acs.nanolett.9b03352
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发表时间：
2020-01-01
期刊：
影响因子：
10.8
通讯作者：
Ter Lim, Sze
中科院分区：
文献类型：
--
作者：
Ghosh, Abhijit;Ma, Fusheng;Ter Lim, Sze
我们展示了磁性纳米结构晶格的高频动力学，该晶格以“人造自旋冰”的形式制造，具有磁挫态。这种结构的动力学特征是多重共振激发，揭示了丰富而有趣的微波特性，这些特性高度依赖于场循环历史。人们发现，控制不同退磁因素相互作用的尺寸和铁磁层厚度等几何参数在控制动力学方面发挥着关键作用。我们的研究结果强调了与磁挫败相关的独特激励的演变，这得到了静态磁力测量研究和微磁模拟的充分支持。
We present high-frequency dynamics of magnetic nanostructure lattices, fabricated in the form of "artificial spin-ice", that possess magnetically frustrated states. Dynamics of such structures feature multiple resonance excitation that reveals rich and intriguing microwave characteristics, which are highly dependent on field-cycle history. Geometrical parameters such as dimensions and ferromagnetic layer thickness, which control the interplay of different demagnetizing factors, are found to play a pivotal role in governing the dynamics. Our findings are highlighted by the evolution of unique excitations pertaining to magnetic frustration, which are well supported by static magnetometry studies and micromagnetic simulations.