Micromagnetic frequency-domain simulation methods for magnonic systems
Micromagnetic frequency-domain simulation methods for magnonic systems
复制标题
磁波系统的微磁频域仿真方法
DOI：
10.1063/5.0131922
复制
发表时间：
2022
影响因子：
3.2
通讯作者：
R. Hertel
中科院分区：
文献类型：
--
作者：
M. d’Aquino;R. Hertel
我们提出了有效的数值方法，用于模拟三维微磁系统中的小磁化振荡。磁化动力学由Landau-Lifshitz-吉尔伯特方程描述，在频域中围绕通用平衡配置线性化，并以特殊算子形式制定，该算子形式允许利用通常用于评估时域微磁模拟中的有效场的大规模技术。通过使用这个公式，我们推导出计算自由磁化振荡的数值算法（即，自旋波本征模）以及由任意形状的纳米磁体的AC射频场驱动的磁化振荡。此外，半解析微扰技术的基础上的本征模的一组减少的计算提供了快速评估的磁化频率响应和吸收谱作为阻尼和交流场的函数。我们提出了有限差分和有限元实现，并证明其有效性的测试用例。这些技术打开了在合理的短时间内研究用几十万（甚至几百万）计算单元离散化的通用磁振子系统的可能性。
We present efficient numerical methods for the simulation of small magnetization oscillations in three-dimensional micromagnetic systems. Magnetization dynamics is described by the Landau–Lifshitz–Gilbert equation, linearized in the frequency domain around a generic equilibrium configuration, and formulated in a special operator form that allows leveraging large-scale techniques commonly used to evaluate the effective field in time-domain micromagnetic simulations. By using this formulation, we derive numerical algorithms to compute the free magnetization oscillations (i.e., spin wave eigenmodes) as well as magnetization oscillations driven by ac radio-frequency fields for arbitrarily shaped nanomagnets. Moreover, semi-analytical perturbation techniques based on the computation of a reduced set of eigenmodes are provided for fast evaluation of magnetization frequency response and absorption spectra as a function of damping and ac field. We present both finite-difference and finite-element implementations and demonstrate their effectiveness on a test case. These techniques open the possibility to study generic magnonic systems discretized with several hundred thousands (or even millions) of computational cells in a reasonably short time.
影响因子：
3.7
作者：
Dmytriiev, O.;Dvornik, M.;Kruglyak, V. V.
通讯作者：
Kruglyak, V. V.
影响因子：
2.7
作者：
Baker, Alexander;Beg, Marijan;Fangohr, Hans
通讯作者：
Fangohr, Hans