三维人工自旋冰中的无张力狄拉克弦和操纵磁荷
Tension-free Dirac strings and steered magnetic charges in 3D artificial spin ice
摘要：
3D纳米结构在现代凝聚态物理中呈现了新的范例，在光子学、生物医学和自旋电子学中具有众多应用。它们有望实现用于超快速和低能量数据存储的3D磁性纳米网络。这些系统中的挫折可能导致磁荷或磁单极子，它们可以作为移动的二进制信息载体。然而，二维人造自旋冰中的狄拉克弦束缚磁荷，而三维偶极对应物需要低温才能稳定。在这里，我们对室温下高度挫败的3D人造自旋冰进行了微磁研究，该冰包含具有未束缚磁荷的无张力狄拉克弦。我们使用微磁学模拟来证明磁荷的迁移率阈值是由$\SI{2}{eV}$低于其未结合能。通过施加全局磁场，我们将磁荷引导到给定的方向，而忽略了意外的切换。该系统为数据传输和存储的3D磁网络铺平了道路
英文摘要：
3D nano-architectures present a new paradigm in modern condensed matter physics with numerous applications in photonics, biomedicine, and spintronics. They are promising for the realisation of 3D magnetic nano-networks for ultra-fast and low-energy data storage. Frustration in these systems can lead to magnetic charges or magnetic monopoles, which can function as mobile, binary information carriers. However, Dirac strings in 2D artificial spin ices bind magnetic charges, while 3D dipolar counterparts require cryogenic temperatures for their stability. Here, we present a micromagnetic study of a highly-frustrated 3D artificial spin ice harboring tension-free Dirac strings with unbound magnetic charges at room temperature. We use micromagnetic simulations to demonstrate that the mobility threshold for magnetic charges is by $\SI{2}{eV}$ lower than their unbinding energy. By applying global magnetic fields, we steer magnetic charges in a given direction omitting unintended switchings. The introduced system paves a way towards 3D magnetic networks for data transport and storage
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