Skaugen Audun, Laurson Lasse
Computational Physics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere, Finland.
Phys Rev Lett. 2022 Mar 4;128(9):097202. doi: 10.1103/PhysRevLett.128.097202.
Domain wall dynamics in ferromagnets is complicated by internal degrees of freedom of the domain walls. We develop a model of domain walls in disordered thin films with perpendicular magnetic anisotropy capturing such features, and use it to study the depinning transition. For weak disorder, excitations of the internal magnetization are rare, and the depinning transition takes on exponent values of the quenched Edwards-Wilkinson equation. Stronger disorder results in disorder-dependent exponents concurrently with nucleation of an increasing density of Bloch lines within the domain wall.
铁磁体中的畴壁动力学因畴壁的内部自由度而变得复杂。我们开发了一个具有垂直磁各向异性的无序薄膜中畴壁的模型来捕捉此类特征，并使用该模型研究脱钉转变。对于弱无序，内部磁化的激发很少见，脱钉转变呈现出淬火爱德华兹 - 威尔金森方程的指数值。更强的无序会导致与畴壁内布洛赫线密度增加的成核同时出现依赖于无序的指数。
