Stochastic behaviour fundamentally limits the performance and reliability of nanomagnetic devices. Typically, stochastic behaviour is assumed to be the result of simple thermal activation, but it may also be “dynamically-induced” i.e. a direct result of the spatial and temporal complexity of magnetisation dynamics. In this paper, we show how materials engineering can be used to comprehensively suppress dynamically induced stochasticity. Using the dynamics of magnetic domain walls in Ni80Fe20 nanowires as a case study we show how manipulation of the Gilbert damping constant via doping with the rare earth element Terbium dramatically simplifies domain wall dynamics. This allows us to obtain quasi-deterministic behaviours from systems that nominally exhibit exceptionally high levels of stochasticity.

中文翻译：

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通过材料工程抑制动态感应的随机磁行为

随机行为从根本上限制了纳米磁性设备的性能和可靠性。通常，随机行为被假定为简单的热激活的结果，但也可能是“动态诱发的”，即磁化动力学的时空复杂性的直接结果。在本文中，我们展示了如何使用材料工程来全面抑制动态引起的随机性。以Ni80Fe20纳米线中磁畴壁的动力学为例，我们展示了通过掺入稀土元素Ter对吉尔伯特阻尼常数的操纵如何显着简化了畴壁动力学。这使我们能够从名义上表现出极高的随机性的系统中获得准确定性行为。