纳米磁体非相干开关和亚稳态形成引起的应变感生磁化抑制的动态误差：尺寸依赖性研究
Dynamic Error in Strain Induced Magnetization Reversal of Nanomagnets due to Incoherent Switching and Formation of Metastable States: A Size-dependent Study
摘要：
用应变调制磁致伸缩纳米磁体的应力各向异性提供了一种极其节能的磁化反转方法。然而，反转过程通常是不相干的，因此在室温下存在热噪声时容易出错。在纳米磁体的潜在景观中不相干的亚稳态的出现可以进一步加剧误差。随机微磁模拟在室温下被用来理解和计算能量耗散和开关错误的概率，在这个重要的磁化开关方法。我们发现，这些数量有一个有趣的依赖纳米磁体的大小：小的纳米磁体表现更好，由于事实上，他们是更有弹性的形成亚稳态和磁化动力学在他们更连贯。然而，对于固定的应力各向异性能量密度，较小的纳米磁体也将具有较差的抵抗热不稳定性的弹性。因此，应变电子学的挑战是通过开发产生最大磁致伸缩的材料和工艺来最大化应力各向异性能量密度。
英文摘要：
Modulation of stress anisotropy of magnetostrictive nanomagnets with strain offers an extremely energy-efficient method of magnetization reversal. The reversal process, however, is often incoherent and hence error-prone in the presence of thermal noise at room temperature. Occurrence of incoherent metastable states in the potential landscape of the nanomagnet can further exacerbate the error. Stochastic micromagnetic simulations at room temperature are used to understand and calculate energy dissipations and switching error probabilities in this important magnetization switching methodology. We find that these quantities have an intriguing dependence on nanomagnet size: small nanomagnets perform better owing to the fact that they are more resilient to the formation of metastable states and magnetization dynamics in them is more coherent. However, for a fixed stress anisotropy energy density, smaller nanomagnets will also have poorer resilience against thermal instability. Thus, the challenge in straintronics is to maximize the stress anisotropy energy density by developing materials and processes that yield the largest magnetostriction.
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