Tunable magnetization dynamics in artificial spin ice via shape anisotropy modification
Tunable magnetization dynamics in artificial spin ice via shape anisotropy modification
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DOI：
10.1103/physrevb.100.054433
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发表时间：
2019-08-23
影响因子：
3.7
通讯作者：
Branford, W. R.
中科院分区：
文献类型：
--
作者：
Dion, T.;Arroo, D. M.;Branford, W. R.
对断开连接的Ni80Fe20纳米线形成的Kagome人工自旋冰进行了铁磁共振(FMR)。在这里，我们通过形状各向异性改变每个子晶格的矫顽场，打破了Kagome晶格的三重角对称性。这使得当磁场沿每个亚晶格排列时，可以产生不同的高频响应，并且还能够在所有纳米线亚晶格中同时激发自旋波共振，这在传统的Kagome ASI中是无法实现的。每个亚晶格不同的矫顽场允许通过全局场进行选择性的磁开关，解锁了在均匀纳米线ASI中无法获得的新的微态。这些态的不同自旋波谱是通过铁磁共振实验探测到的，并通过微磁模拟将其与下面的微态联系起来。
Ferromagnetic resonance (FMR) is performed on kagome artificial spin ice (ASI) formed of disconnected Ni80Fe20 nanowires. Here we break the threefold angular symmetry of the kagome lattice by altering the coercive field of each sublattice via shape anisotropy modification. This allows for distinct high-frequency responses when a magnetic field is aligned along each sublattice and additionally enables simultaneous spin-wave resonances to be excited in all nanowire sublattices, unachievable in conventional kagome ASI. The different coercive field of each sublattice allows selective magnetic switching via global field, unlocking novel microstates inaccessible in homogeneous-nanowire ASI. The distinct spin-wave spectra of these states are detected experimentally via FMR and linked to underlying microstates using micromagnetic simulation.