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arXiv 1709.08009cond-mat.mes-hall
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铁磁薄膜中畴壁的钉扎

Pinning of Domain Walls in thin Ferromagnetic Films

Vincent Jeudy, Rebeca Diaz Pardo, Williams Savero Torres, Sebastian Bustingorry, Alejandro Kolton

摘要:

本文对垂直各向异性薄磁体中的磁畴壁钉扎进行了定量研究。一个自洽的描述,利用普遍的功能的退钉扎和热激活的亚阈值蠕变制度中观察到的领域驱动的畴壁速度,是用来确定有效的钉扎参数控制的畴壁动力学:钉扎势垒的有效高度,退钉扎阈值,和速度在退钉扎。在此框架内,发表在文献中的结果的分析允许在很宽的温度范围内的一组磁性材料的钉扎性能的定量比较。在标度参数的基础上,从有效钉扎和微磁参数估计了控制钉扎的微观参数:钉扎相关长度、集体钉扎畴壁长度(Larkin长度)和钉扎无序强度。热效应的分析揭示了不同的钉扎长度尺度和强度之间的交叉在较低的约化温度。

英文摘要:

We present a quantitative investigation of magnetic domain wall pinning in thin magnets with perpendicular anisotropy. A self-consistent description exploiting the universal features of the depinning and thermally activated sub-threshold creep regimes observed in the field driven domain wall velocity, is used to determine the effective pinning parameters controlling the domain wall dynamics: the effective height of pinning barriers, the depinning threshold, and the velocity at depinning. Within this framework, the analysis of results published in the literature allows for a quantitative comparison of pinning properties for a set of magnetic materials in a wide temperature range. On the basis of scaling arguments, the microscopic parameters controlling the pinning: the correlation length of pinning, the collectively pinned domain wall length (Larkin length) and the strength of pinning disorder, are estimated from the effective pinning and the micromagnetic parameters. The analysis of thermal effects reveals a crossover between different pinning length scales and strengths at low reduced temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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