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首页> 外文期刊>Physica, C. Superconductivity and its applications >Tunable ratchet effects for vortices pinned by periodic magnetic dipole arrays
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Tunable ratchet effects for vortices pinned by periodic magnetic dipole arrays

机译：周期性磁偶极子阵列固定的涡流的棘轮效应可调

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摘要

The ratchet effect is demonstrated theoretically for the simple model of a vortex in a thin superconducting film interacting with a periodic array of magnetic dipoles placed in the vicinity of the film. The pinning potential for the vortex is calculated in the London limit and found to break spatial inversion symmetry and to depend oil the orientation of the magnetic dipole moments. The motion of the vortex at zero temperature driven by a force oscillating periodically in time is investigated numerically. Drift vortex motion consisting of displacements by a translation vector of the dipole array during each period of oscillation is obtained kind studied in detail. The direction of drift differs in general from that of the driving force, except if the driving force oscillates in a direction of high symmetry of the dipole array. The vortex drift velocity depends oil the orientation of the magnetic moments, and call be tuned by rotating the dipoles. It is pointed out that if the magnetic moments are free to rotate, the ratchet effect can be produced and tuned by a magnetic field applied parallel to the film surfaces. (c) 2005 Elsevier B.V. All rights reserved.
机译：从理论上证明了棘齿效应，它是一种超薄薄膜中的涡旋的简单模型，该薄膜与放置在薄膜附近的周期性磁偶极子相互作用而相互作用。在伦敦极限中计算出旋涡的钉扎电势，发现它会破坏空间反演的对称性，并取决于油的磁偶极矩的方向。数值研究了在零温度下涡流的运动，该运动是由时间周期性振荡的力驱动的。详细研究了一种在每个振荡周期内由偶极子阵列的平移矢量位移引起的漂移涡运动。漂移的方向通常与驱动力的方向不同，除了驱动力沿偶极子阵列的高度对称的方向振动之外。涡流漂移速度取决于油的磁矩的方向，并通过旋转偶极子来调谐。要指出的是，如果磁矩自由旋转，则可以通过平行于薄膜表面施加的磁场来产生并调节棘轮效应。 （c）2005 Elsevier B.V.保留所有权利。

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