Creation and measurement of long-lived magnetic monopole currents in spin ice
Creation and measurement of long-lived magnetic monopole currents in spin ice
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DOI：
10.1038/nphys1896
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发表时间：
2011-03-01
期刊：
影响因子：
19.6
通讯作者：
Terry, I.
中科院分区：
文献类型：
--
作者：
Giblin, S. R.;Bramwell, S. T.;Terry, I.
最近在自旋冰中发现的“磁性”提出了一个问题，即是否可以通过施加磁场来创建和操纵磁“单极子”的长寿命电流。在这里，我们证明他们可以。通过在0.36 K下对Dy 2 Ti 2 O 7自旋冰晶施加磁场脉冲，我们产生了持续几分钟的弛豫磁电流。我们测量电流的电动势，它在耦合到一个敏感的放大器的螺线管感应的装置，并定量描述它使用的化学动力学模型的点状电荷服从Onsager-Wien机制的载流子解离和重组。因此，我们推导出自旋冰中的自旋运动的微观参数，并确定了自由磁荷和束缚磁荷的不同作用。我们的结果说明了一个基本的电容效应的磁荷，并应铺平道路的设计和实现的“磁电子”电路。
The recent discovery of 'magnetricity' in spin ice raises the question of whether long-lived currents of magnetic 'monopoles' can be created and manipulated by applying magnetic fields. Here we show that they can. By applying a magnetic-field pulse to a Dy2Ti2O7 spin-ice crystal at 0.36 K, we create a relaxing magnetic current that lasts for several minutes. We measure the current by means of the electromotive force it induces in a solenoid coupled to a sensitive amplifier, and quantitatively describe it using a chemical kinetic model of point-like charges obeying the Onsager-Wien mechanism of carrier dissociation and recombination. We thus derive the microscopic parameters of monopole motion in spin ice and identify the distinct roles of free and bound magnetic charges. Our results illustrate a basic capacitor effect for magnetic charge and should pave the way for the design and realization of 'magnetronic' circuitry.