Photo-Magnonics: Materials and devices

我们在过去证明，通过使用飞秒激光实验，有可能有效地泵浦具有高进动幅度的自旋波。另一方面，在新的计算和信息设备中使用自旋波，称为磁振子，变得很有吸引力。我们将开辟一条新的路线：将“魔术”与光学接入相结合--“照片魔术”。中心方面是实现飞秒激光脉冲以激发和检测二维磁子晶体中的磁振子模式。类似于光子晶体，人们观察到巡回的自旋波布洛赫态。特别令人感兴趣的是偶极自旋波模式，其优点是通过改变磁化方向可以很容易地控制它们的折射率。我们将集中在某些方面来推进这一新兴领域，即对这些人工自旋波材料的性质的研究，特别是对周期反点晶格中自旋波态的受控局域和离域的理解。这将允许在项目期结束时利用新的自旋波泵浦源和飞秒激光脉冲探测，实现作为光磁波导和有源自旋波元件的第一批设备。

We demonstrated in the past that by using femtosecond laser experiments, it is possible to pump spin waves with high precession amplitudes efficiently. On the other hand to use spin waves in novel computation and information devices, named magnonics, became appealing. We will open up a new route: combining “magnonics” with optical access — “photo-magnonics”. The central aspect is the implementation of femtosecond laser pulses for excitation and detection of the magnon modes in two dimensional magnonic crystals. In analogy to photonic crystals one observes itinerant spin-wave Bloch states. Of special interest are dipolar spin-wave modes, whose advantage is that their index of refraction can be easily manipulated by changing the magnetization direction. We will focus on certain aspects to advance this emerging field, which is the investigation of the properties of these artificial spin-wave materials, especially an understanding of the controlled localization and delocalization of spin-wave states in periodic anti-dot lattices. This will allow the realization of first devices as photo-magnonic wave guides and active spin-wave elements using the novel source of spin-wave pumping and detection by femtosecond laser pulses at the end of the project period.