论文标题
方格人造自旋冰中的磁振荡模式
Magnetic oscillation modes in square lattice artificial spin ice
论文作者
论文摘要
在平方晶格上的人造自旋冰中考虑了小振幅偶极振荡。假定自旋冰中每个细长磁岛的净磁矩具有类似海森堡的动力学。假定每个岛的磁矩受到形状各向异性的影响以及与其最近的邻居的偶极相互作用。将磁化动力学在基态之一周围线性化，导致$ 8 \ times 8 $矩阵对磁性自旋波模式进行对角线化。就其平面动力学波动而言，发现并归类为抗对称和对称性的分析溶液。尽管仅包括领先的偶极相互作用，但与这些模式相似，可以在实验上观察到。
Small amplitude dipolar oscillations are considered in artificial spin ice on a square lattice in two dimensions. The net magnetic moment of each elongated magnetic island in the spin ice is assumed to have Heisenberg-like dynamics. Each island's magnetic moment is assumed to be influenced by shape anisotropies and by the dipolar interactions with its nearest neighbors. The magnetic dynamics is linearized around one of the ground states, leading to an $8\times 8$ matrix to be diagonalized for the magnetic spin wave modes. Analytic solutions are found and classified as antisymmetric and symmetric with regard to their in-plane dynamic fluctuations. Although only the leading dipolar interactions are included, modes similar to these may be observable experimentally.
