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arXiv 2009.00593cond-mat.stat-mech
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一种不需事先假设区域斑图的含时Ginzburg-Landau动力学伊辛模型中斑图形成的相位预测方法

A Phase Prediction Method for Pattern Formation in Time-Dependent Ginzburg-Landau Dynamics for Kinetic Ising Model without a priori Assumptions on Domain Patterns

Ryoji Anzaki, Shin-ichi Ito, Hiromichi Nagao, Masaichiro Mizumaki, Masato Okada, Ichiro Akai

摘要:

提出了一种在含时Ginzburg-Landau动力学模型下,考虑偶极-偶极相互作用的单轴二维动力学伊辛模型中斑图形成的相位预测方法.考虑到材料厚度的影响,通过假设沿磁化轴的均匀性,该模型对应于薄的磁性材料与长程排斥相互作用。我们提出了一个新的理论基础来理解的影响的材料参数的磁畴图案的形成的平衡方程的线性和非线性力之间的平衡在平衡态。在此理论基础上,我们提出了一种新的方法来预测在给定参数的动力学条件下,经过时间演化后所达到的平衡态中的相位。安扎基湾福岛,Y。Hidaka和T. Oka,Ann. Phys. 353,107(2015)],适用于$ϕ^4$模型。虽然该方法与实际数值结果并不完全一致,但它没有任意的参数和函数来调整预测。换句话说,它是一种对域模式没有先验假设的方法。

英文摘要:

We propose a phase prediction method for the pattern formation in the uniaxial two-dimensional kinetic Ising model with the dipole-dipole interactions under the time-dependent Ginzburg-Landau dynamics. Taking the effects of the material thickness into account by assuming the uniformness along the magnetization axis, the model corresponds to thin magnetic materials with long-range repulsive interactions. We propose a new theoretical basis to understand the effects of the material parameters on the formation of the magnetic domain patterns in terms of the equation of balance governing the balance between the linear- and nonlinear forces in the equilibrium state. Based on this theoretical basis, we propose a new method to predict the phase in the equilibrium state reached after the time-evolution under the dynamics with a given set of parameters, by approximating the third-order term using the restricted phase-space approximation [R. Anzaki, K. Fukushima, Y. Hidaka, and T. Oka, Ann. Phys. 353, 107 (2015)] for the $ϕ^4$-models. Although the proposed method does not have the perfect concordance with the actual numerical results, it has no arbitrary parameters and functions to tune the prediction. In other words, it is a method with no a priori assumptions on domain patterns.

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