arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.08808cond-mat.mes-hall
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磁液滴孤子

Magnetic Droplet Solitons

Ferran Macià, Andrew D. Kent

摘要:

磁液滴孤子是在具有垂直磁各向异性的薄膜中自旋波相互吸引作用而形成的动态磁织构。自旋电流和与这些电流相关联的自旋力矩使得它们能够形成,因为它们提供了激发非平衡自旋波布居并补偿其衰减的手段。近年来,实现和研究磁性液滴的实验取得了迅速进展。重要的进展包括液滴的第一个直接x射线图像,确定其阈值和维持电流,测量其产生和湮灭时间以及漂移不稳定性的证据,这可能限制它们在自旋转移纳米接触中的寿命。本文回顾了这些研究,并将这些孤子与其他类型的自旋电流激发(如自旋波子弹)和静态磁纹理(包括磁涡旋和skyrmions)进行了对比。磁液滴孤子也可以作为电流控制的微波频率振荡器,在神经形态芯片中作为具有记忆功能的非线性振荡器具有潜在的应用前景。

英文摘要:

Magnetic droplet solitons are dynamical magnetic textures that form due to an attractive interaction between spin waves in thin films with perpendicular magnetic anisotropy. Spin currents and the spin torques associated with these currents enable their formation as they provide a means to excite non-equilibrium spin wave populations and compensate their decay. Recent years have seen rapid advances in experiments that realize and study magnetic droplets. Important advances include the first direct x-ray images of droplets, determination of their threshold and sustaining currents, measurement of their generation and annihilation time and evidence for drift instabilities, which can limit their lifetime in spin-transfer nanocontacts. This article reviews these studies and contrasts these solitons to other types of spin-current excitations such as spin-wave bullets, and static magnetic textures, including magnetic vortices and skyrmions. Magnetic droplet solitons can also serve as current controlled microwave frequency oscillators with potential applications in neuromorphic chips as nonlinear oscillators with memory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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