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Theory for a dissipative droplet soliton excited by a spin torque nanocontact

机译:自旋扭矩纳米接触激发耗散液滴孤子的理论

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A distinct type of solitary wave is predicted to form in spin torque oscillators when the free layer has a sufficiently large perpendicular anisotropy. In this structure, which is a dissipative version of the conservative droplet soliton originally studied in 1977 by Ivanov and Kosevich, spin torque counteracts the damping that would otherwise destroy the mode. Asymptotic methods are used to derive conditions on perpendicular anisotropy strength and applied current under which a dissipative droplet can be nucleated and sustained. Numerical methods are used to confirm the stability of the droplet against various perturbations that are likely in experiments, including tilting of the applied field, nonzero spin torque asymmetry, and nontrivial Oersted fields. Under certain conditions, the droplet experiences a drift instability in which it propagates away from the nanocontact and is then destroyed by damping.
机译:当自由层具有足够大的垂直各向异性时,预计会在自旋扭矩振荡器中形成独特类型的孤波。在这种结构中,它是最初由Ivanov和Kosevich于1977年研究的保守液滴孤子的耗散形式,自旋扭矩抵消了阻尼,否则该阻尼会破坏模式。渐近方法用于导出垂直各向异性强度和所施加电流的条件,在这些条件下可以使耗散液滴成核并得以维持。使用数值方法来确认液滴对实验中可能发生的各种扰动的稳定性,包括施加场的倾斜,非零自旋转矩不对称和非平凡的奥斯特场。在某些条件下,液滴会经历漂移不稳定性,在此过程中,液滴会从纳米触点传播开,然后被阻尼破坏。

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