Vortex-rectification effects in films with periodic asymmetric pinning.
Vortex-rectification effects in films with periodic asymmetric pinning.
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DOI：
10.1103/physrevlett.94.057003
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发表时间：
2005-01
影响因子：
8.6
通讯作者：
J. Vondel;C. D. S. Silva;B. Zhu;M. Morelle;V. Moshchalkov
中科院分区：
文献类型：
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作者：
J. Vondel;C. D. S. Silva;B. Zhu;M. Morelle;V. Moshchalkov
我们研究了由交流电流激发的涡旋在具有纳米工程非对称反点阵列的Al膜中的输运。涡流对交流电流的响应进行了研究，作为交流电流幅值，磁场和温度的函数的电压输出的详细测量。测量结果表明，显着的电压整流效应，其主要特点是由两个关键的不对称电位脱钉力。净直流电压的形状作为激励幅度的函数，表明我们的涡棘轮行为的方式非常不同于标准的过阻尼模型。相反，阻止涡旋运动所需的再钉扎力远小于去钉扎力，类似于所谓的惯性棘轮的行为。基于欠阻尼棘轮模型的计算提供了一个非常好的适合的实验数据。
We study the transport of vortices excited by an ac current in an Al film with an array of nanoengineered asymmetric antidots. The vortex response to the ac current is investigated by detailed measurements of the voltage output as a function of ac current amplitude, magnetic field, and temperature. The measurements revealed pronounced voltage rectification effects which are mainly characterized by the two critical depinning forces of the asymmetric potential. The shape of the net dc voltage as a function of the excitation amplitude indicates that our vortex ratchet behaves in a way very different from standard overdamped models. Rather, the repinning force, necessary to stop vortex motion, is considerably smaller than the depinning force, resembling the behavior of the so-called inertia ratchets. Calculations based on an underdamped ratchet model provide a very good fit to the experimental data.