Visualization of spin dynamics in single nanosized magnetic elements
Visualization of spin dynamics in single nanosized magnetic elements
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DOI：
10.1088/0957-4484/22/29/295713
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发表时间：
2011-07-22
期刊：
影响因子：
3.5
通讯作者：
Lindner, J.
中科院分区：
文献类型：
--
作者：
Banholzer, A.;Narkowicz, R.;Lindner, J.
未来的自旋电子器件的设计需要一个定量的了解微观的线性和非线性自旋弛豫过程中的纳米尺度的铁磁系统的磁化反转。铁磁共振是在单一实验中定量分析弛豫率、磁各向异性和磁化率的首选方法。该方法提供了通过微波辐射进行纳米尺度结构的相干控制和操纵的可能性。在这里，我们分析了不同的激发模式在一个单一的纳米尺寸的铁磁条。使用微谐振器设置进行测量，该微谐振器设置提供定量分析具有体积（100 nm）的单个纳米磁体的动态和静态磁特性的灵敏度（3）。均匀以及非均匀的自旋波激发光谱的体积模式被确定，并发现是在良好的协议与微磁模拟的结果，使这些模式在纳米结构中的空间分布的可视化。
The design of future spintronic devices requires a quantitative understanding of the microscopic linear and nonlinear spin relaxation processes governing the magnetization reversal in nanometer-scale ferromagnetic systems. Ferromagnetic resonance is the method of choice for a quantitative analysis of relaxation rates, magnetic anisotropy and susceptibility in a single experiment. The approach offers the possibility of coherent control and manipulation of nanoscaled structures by microwave irradiation. Here, we analyze the different excitation modes in a single nanometer-sized ferromagnetic stripe. Measurements are performed using a microresonator set-up which offers a sensitivity to quantitatively analyze the dynamic and static magnetic properties of single nanomagnets with volumes of (100 nm)(3). Uniform as well as non-uniform volume modes of the spin wave excitation spectrum are identified and found to be in excellent agreement with the results of micromagnetic simulations which allow the visualization of the spatial distribution of these modes in the nanostructures.