Photo-Magnonics: Materials and devices

我们在过去的实验中证明，利用飞秒激光实验，可以有效地泵浦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，被称为磁振学，变得很有吸引力。我们将开辟一条“磁振学”与光接入相结合的新路线——“光磁振学”。中心方面是实现飞秒激光脉冲激发和探测二维磁振子晶体中的磁振子模式。与光子晶体类似，人们观察到流动的自旋波布洛赫态。特别令人感兴趣的是偶极自旋波模式，其优点是它们的折射率可以很容易地通过改变磁化方向来控制。我们将重点关注这一新兴领域的某些方面，即对这些人工自旋波材料的性质的研究，特别是对周期性反点阵中自旋波状态的可控局域化和非局域化的理解。这将允许实现第一个器件作为光磁波导和主动自旋波元件使用自旋波泵浦和探测飞秒激光脉冲在项目末期的新来源。

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.