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首页> 外文期刊>Physical review >Building Blocks Of An Artificial Kagome Spin Ice: Photoemission Electron Microscopyrnof Arrays Of Ferromagnetic Islands
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Building Blocks Of An Artificial Kagome Spin Ice: Photoemission Electron Microscopyrnof Arrays Of Ferromagnetic Islands

机译：人工Kagome自旋冰的构建基块：铁磁岛的光发射电子显微镜阵列

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摘要

Arrays of dipolar coupled ferromagnetic islands arranged in specific geometries provide ideal systems to directly study frustration. We have examined with photoemission electron microscopy the magnetic configurations in three basic building blocks of an artificial kagome spin ice consisting of one, two, and three rings. The kagome spin ice arrangement is particularly interesting because it is highly frustrated and the three interactions at a vertex are equivalent. Employing dipolar energy calculations, we are able to make a full characterization of the magnetic states and therefore identify the lowest energy states. Experimentally we find that the ice rule is always obeyed even at low dipolar coupling strengths. However, as the number of rings increases there is a drastic decrease in the ability to achieve the low-energy states via demagnetization, a behavior also identified in the magnetization reversal. This carries the implication that the ground state will never be achieved in the infinite system. Finally, we show that at low coupling, the applied field direction governs the resulting states. This work opens the door to a novel class of systems for future spintronic applications.
机译：以特定几何形状排列的偶极耦合铁磁岛阵列提供了直接研究挫败感的理想系统。我们用光发射电子显微镜检查了由一个，两个和三个环组成的人造kagome自旋冰的三个基本构造块中的磁性构型。 kagome自旋冰的布置特别有趣，因为它极度受挫，并且顶点处的三个相互作用是等效的。利用偶极能量计算，我们可以对磁态进行全面表征，从而确定最低的能量态。从实验上我们发现，即使在低偶极耦合强度下也始终遵守冰规则。但是，随着环数的增加，通过退磁获得低能态的能力将急剧下降，这种现象在磁化反转中也得到了证实。这暗示着在无限系统中将永远无法获得基态。最后，我们表明，在低耦合下，所施加的场方向决定了结果状态。这项工作为将来的自旋电子学应用打开了一类新颖的系统之门。

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