Controlling collective rotational patterns of magnetic rotors.,Nature Communications

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Controlling collective rotational patterns of magnetic rotors.
Nature Communications ( IF 14.7 ) Pub Date : 2019-10-16 , DOI: 10.1038/s41467-019-12665-w
Daiki Matsunaga _{1,

2} , Joshua K Hamilton _{3,

4} , Fanlong Meng _{1,

5} , Nick Bukin ₃ , Elizabeth L Martin ₃ , Feodor Y Ogrin ₃ , Julia M Yeomans ₁ , Ramin Golestanian _{1,

5}

Affiliation

Magnetic actuation is widely used in engineering specific forms of controlled motion in microfluidic applications. A challenge, however, is how to extract different desired responses from different components in the system using the same external magnetic drive. Using experiments, simulations, and theoretical arguments, we present emergent rotational patterns in an array of identical magnetic rotors under an uniform, oscillating magnetic field. By changing the relative strength of the external field strength versus the dipolar interactions between the rotors, different collective modes are selected by the rotors. When the dipole interaction is dominant the rotors swing upwards or downwards in alternating stripes, reflecting the spin-ice symmetry of the static configuration. For larger spacings, when the external field dominates over the dipolar interactions, the rotors undergo full rotations, with different quarters of the array turning in different directions. Our work sheds light on how collective behaviour can be engineered in magnetic systems.

中文翻译：

控制磁转子的集体旋转模式。

在微流体应用中，电磁致动被广泛用于工程形式的受控运动。然而，一个挑战是如何使用相同的外部磁驱动器从系统中的不同组件中提取不同的期望响应。使用实验，模拟和理论论证，我们在均匀，振荡的磁场下，以相同的磁转子阵列形式呈现了新兴的旋转模式。通过改变外场强度的相对强度与转子之间的偶极相互作用，转子可以选择不同的集体模式。当偶极子相互作用起主导作用时，转子以交替的条纹向上或向下摆动，反映出静态结构的自旋冰对称性。对于较大的间距，当外部磁场在偶极相互作用中占主导地位时，转子将经历完整的旋转，阵列的四分之三将以不同的方向旋转。我们的工作揭示了如何在磁性系统中设计集体行为。

更新日期：2019-10-17

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