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首页> 外文期刊>Physical review >Pinning, ordering, and dynamics of vortices in conformal crystal and gradient pinning arrays
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Pinning, ordering, and dynamics of vortices in conformal crystal and gradient pinning arrays

机译：保形晶体和梯度固定阵列中涡旋的固定，排序和动力学

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摘要

We numerically investigate magnetization, pinning, ordering, and dynamics of vortices interacting with pinning arrangements which have a density gradient. We focus on conformal crystal structures obtained by conformally transforming a spatially uniform periodic array, as well as nonconformal gradient structures and structures with quasiperiodic order. The conformal structures feature a density gradient and local ordering. Using magnetization simulations we find that conformal pinning arrays exhibit enhanced pinning compared to nonconformal gradient arrays as well as compared to random, periodic, and quasiperiodic arrays, for a broad range of fields. The effectiveness of conformal arrays arises from the continuum of length scales introduced into the arrays by the conformal transformation, allowing for a broad range of local commensuration effects. At higher vortex fillings above the range of conformal effectiveness, we show that a nonconformal rectangular gradient array exhibits strong pinning due to a novel commensuration effect and vortex ordering. Using transport simulations where vortices are driven along the gradient and at an angle to the gradient, we confirm the effectiveness of conformal pinning at increasing the critical current. For a rotated drive, the gradient arrays produce a strong vortex guidance effect in the direction perpendicular to the gradient.
机译：我们在数值上研究了与具有密度梯度的钉扎结构相互作用的涡旋的磁化，钉扎，有序和动力学。我们专注于通过对空间上均匀的周期阵列进行保形变换而获得的保形晶体结构，以及非保形梯度结构和准周期结构。保形结构具有密度梯度和局部有序性。使用磁化模拟，我们发现，在广泛的领域中，与非保形梯度阵列以及随机，周期性和准周期阵列相比，保形固定阵列显示出增强的固定。共形阵列的有效性来自于通过共形变换引入阵列中的长度尺度的连续性，从而允许广泛的局部相称效应。在高于共形有效范围的较高涡旋填充下，我们显示出由于新的相称效应和涡旋排序，非共形矩形梯度阵列显示出强大的固定作用。使用沿梯度并与梯度成一定角度驱动涡流的传输模拟，我们确认了保形销钉在增加临界电流方面的有效性。对于旋转驱动器，梯度阵列会在垂直于梯度的方向上产生强大的涡流引导效果。

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  • 来源
    《Physical review》 |2014年第9期|094502.1-094502.16|共16页
  • 作者

    D. Ray; C. Reichhardt; C. J. Olson Reichhardt;

  • 作者单位

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

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