论文标题
量化垂直磁化的铁磁纳米磁性中的热稳定性，并带有前向通量采样
Quantifying the thermal stability in perpendicularly magnetized ferromagnetic nanodisks with forward flux sampling
论文作者
论文摘要
对于信息存储中的应用，纳米结构磁系统中的热稳定性是一个重要问题。从理论和仿真的角度来看，热激活过渡的准确预测是一个具有挑战性的问题，因为所需的保留时间在10年的阶段，而进型磁化动力学的特征时间尺度是纳米秒的顺序。在这里，我们介绍了使用正向通量采样方法的垂直磁化铁磁磁盘的形式的磁元素的热稳定性的理论研究，这对于模拟罕见事件很有用。我们展示了两个均匀磁化的``向上''和````向上''和````up'''和````up''''和``down''状态的速率，该状态通过域壁成核和传播发生，随着界面dzyaloshinskii-moriya的相互作用而变化，这会影响分离这些状态的能量屏障。此外，我们发现，基于尝试频率通常假定的1 GHz值的估计值，平均寿命与估计值不同。
The thermal stability in nanostructured magnetic systems is an important issue for applications in information storage. From a theoretical and simulation perspective, an accurate prediction of thermally-activated transitions is a challenging problem because desired retention times are on the order of 10 years, while the characteristic time scale for precessional magnetization dynamics is of the order of nanoseconds. Here, we present a theoretical study of the thermal stability of magnetic elements in the form of perpendicularly-magnetized ferromagnetic disks using the forward flux sampling method, which is useful for simulating rare events. We demonstrate how rates of thermally-activated switching between the two uniformly-magnetized ``up'' and ``down'' states, which occurs through domain wall nucleation and propagation, vary with the interfacial Dzyaloshinskii-Moriya interaction, which affect the energy barrier separating these states. Moreover, we find that the average lifetimes differ by several orders of magnitude from estimates based on the commonly assumed value of 1 GHz for the attempt frequency.
