Zeitaufgelöste Mikroskopie von Spinwellenanregungen

在这个提议中，我们希望将我们在成像磁化动力学方面的专业知识与我们在制造和表征适合由于自旋转移效应产生大振幅自旋波的点接触方面所取得的进展结合起来。我们将研究由点接触产生的自旋转移诱导自旋波的发射特性。此外，我们将研究自旋波开关等简单测试设备中的自旋波干扰。自旋波在铁磁薄膜中的传播不仅从基本观点来看是有趣的，而且在应用上也可能变得重要。一个例子是自旋波逻辑。在这里，可以利用薄膜中自旋波的特殊色散关系。构造具有正色散或负色散区域的磁性微结构是可能的。这些元素的组合导致了有趣的现象（自旋波开关，移相器等）。第二个例子是自旋转移扭矩振荡器相控阵的构建。发展由自旋波传播介导的锁相需要考虑自旋波的色散关系。

Within this proposal we would like to combine our expertise in imaging magnetization dynamics with the progress we have made in fabricating and characterizing point contacts suitable for the generation of large amplitude spin waves due to spin transfer effects. We will study the emission characteristics of spin transfer induced spin waves emanating from point contacts. Furthermore, we will study spin wave interference in simple test devices such as spin wave switches. Spin wave propagation in thin ferromagnetic films is not only interesting from a fundamental point of view, but might also become of importance for applications. One example is spin wave logic. Here, the special dispersion relations of spin waves in thin film can be exploited. It is possible to construct magnetic microstructures with areas showing positive dispersion or negative dispersion. The combination of such elements leads to interesting phenomena (spin wave switches, phase shifters etc.) A second example is the construction of phased arrays of spin transfer torque oscillators. The dispersion relations of spin waves need to be taken into account for the development of phase locking mediated by propagating spin waves.