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arXiv 2109.14451cond-mat.stat-mechcond-mat.dis-nn
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薄膜畴壁的脱钉指数依赖于无序强度

Depinning exponents of thin film domain walls depend on disorder strength

Audun Skaugen, Lasse Laurson

摘要:

铁磁体中的畴壁动力学由于畴壁的内部自由度而变得复杂。我们发展了一个具有垂直磁各向异性的无序薄膜中畴壁的模型,并利用它来研究脱钉转变。对于弱无序,内部磁化的激发是罕见的,并且脱钉转变呈现淬灭的Edwards-Wilkinson方程的指数值。更强的无序导致无序相关的指数,同时与畴壁内的布洛赫线的密度增加的成核。

英文摘要:

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.

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