Suppression of Dynamically Induced Stochastic Magnetic Behavior Through Materials Engineering
Suppression of Dynamically Induced Stochastic Magnetic Behavior Through Materials Engineering
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DOI：
10.1103/physrevapplied.13.024039
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发表时间：
2020-02
影响因子：
4.6
通讯作者：
T. J. Broomhall;A. Rushforth;M. Rosamond;E. Linfield;T. Hayward
中科院分区：
文献类型：
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作者：
T. J. Broomhall;A. Rushforth;M. Rosamond;E. Linfield;T. Hayward
随机行为从根本上限制了纳米磁性器件的性能和可靠性。通常，随机行为被假设为简单热激活的结果，但它也可以是“动态诱导的”，即，磁化动力学的空间和时间复杂性的直接结果。在这里，我们展示了如何材料工程可以用来全面抑制动态引起的随机性。作为一个案例研究，我们使用的动力学的磁畴壁Ni80 Fe20纳米线，显示如何操纵的吉尔伯特阻尼常数通过掺杂稀土元素铽显着简化畴壁动力学。这使我们能够从名义上表现出非常高水平的随机性的系统中获得准确定性行为。
Stochastic behavior fundamentally limits the performance and reliability of nanomagnetic devices. Typically, stochastic behavior 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 magnetization dynamics. Here, 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 behaviors from systems that nominally exhibit exceptionally high levels of stochasticity.