Isolating the dynamic dipolar interaction between a pair of nanoscale ferromagnetic disks.
Isolating the dynamic dipolar interaction between a pair of nanoscale ferromagnetic disks.
复制标题
隔离一对纳米级铁磁盘之间的动态偶极相互作用。
DOI：
10.1103/physrevlett.110.187202
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发表时间：
2013
影响因子：
8.6
通讯作者：
C. Ulysse
中科院分区：
文献类型：
--
作者：
P. Keatley;P. Gangmei;M. Dvornik;R. Hicken;J. Grollier;C. Ulysse
密距纳米磁体自旋波本征模之间的动态偶极相互作用决定了磁子和自旋电子超材料和器件的集体行为。然而，动态偶极相互作用很难量化，因为它们的影响必须从静态偶极相互作用和纳米磁体的形状、大小和磁性质的变化中分离出来。结果表明，当两个模态相似但不相同的不完美纳米磁盘靠近时，可以通过考虑两个磁盘内进动相位的差异来检测动态偶极相互作用的影响。测量结果表明，这种相互作用比微磁模拟中预期的要强，这突出了在深层纳米尺度上表征和控制磁性质的必要性，以及改进对集体磁性现象的控制的潜力。我们的方法同样适用于其他物理系统，其中动态相互作用被非均匀扩展和静态相互作用所掩盖。
Dynamic dipolar interactions between spin wave eigenmodes of closely spaced nanomagnets determine the collective behavior of magnonic and spintronic metamaterials and devices. However, dynamic dipolar interactions are difficult to quantify since their effects must be disentangled from those of static dipolar interactions and variations in the shape, size, and magnetic properties of the nanomagnets. It is shown that when two imperfect nanoscale magnetic disks with similar but nonidentical modes are brought into close proximity, the effect of the dynamic dipolar interaction can be detected by considering the difference of the phase of precession within the two disks. Measurements show that the interaction is stronger than expected from micromagnetic simulations, highlighting both the need for characterization and control of magnetic properties at the deep nanoscale, and also the potential for improved control of collective magnetic phenomena. Our approach is equally applicable to other physical systems in which dynamic interactions are obscured by inhomogeneous broadening and static interactions.