纳米接触液滴孤子通过漂移不稳定性的随机喷射
Stochastic ejection of nanocontact droplet solitons via drift instability
摘要：
磁液滴孤子是存在于具有垂直磁各向异性的铁磁薄膜中的一种大振幅相干旋进波态。为了有效地维持液滴，可以在纳米接触区域中局部补偿磁阻尼，从而赋予自旋转移扭矩;这已经在实验中成功地部署，以直接对液滴成像并以电方式探测其动态。然而，理论预测和实验表明漂移不稳定性的存在，由此液滴从自旋转移扭矩活性区域喷射并随后衰减，这种效应可能会增强或可能由热波动引起。利用孤子微扰理论和大偏差理论，确定了热场作用下孤子的射出速率和射出孤子的最可能轨迹。这些结果导致一个有效的下限的自旋转移扭矩纳米接触器件在有限的温度下工作的磁液滴孤子的稳定性和点的方式，可以使液滴更强大。
英文摘要：
The magnetic droplet soliton is a large amplitude, coherently precessing wave state that exists in ferromagnetic thin films with perpendicular magnetic anisotropy. To effectively sustain a droplet, magnetic damping can be locally compensated in a nanocontact region that imparts spin-transfer torque; this has been successfully deployed in experiment to directly image the droplet and probe its dynamics electrically. However, theory predicts and experiments indicate the existence of a drift instability whereby the droplet is ejected from the spin-transfer-torque-active region and subsequently decays, an effect that may be enhanced or possibly induced by thermal fluctuations. Using soliton perturbation theory and large deviation theory, this work determines the soliton ejection rate and the most likely path an ejected soliton tracks in the presence of thermal fields. These results lead to an effective lower bound on the stability of magnetic droplet solitons in spin-transfer torque nanocontact devices operating at finite temperature and point to ways in which droplets can be made more robust.
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