Muscas Giuseppe, Jönsson Petra E, Serrano I G, Vallin Örjan, Kamalakar M Venkata
Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden.
Nanoscale. 2021 Mar 28;13(12):6043-6052. doi: 10.1039/d0nr08355k. Epub 2021 Mar 19.
The integration of magneto-electric and spintronic sensors to flexible electronics presents a huge potential for advancing flexible and wearable technologies. Magnetic nanowires are core components for building such devices. Therefore, realizing flexible magnetic nanowires with engineered magneto-elastic properties is key to flexible spintronic circuits, as well as creating unique pathways to explore complex flexible spintronic, magnonic, and magneto-plasmonic devices. Here, we demonstrate highly resilient flexible ferromagnetic nanowires on transparent flexible substrates for the first time. Through extensive magneto-optical Kerr experiments, exploring the Villari effect, we reveal an ultralow magnetostrictive constant in nanowires, a two-order reduced value compared to bulk values. In addition, the flexible magnetic nanowires exhibit remarkable resilience sustaining bending radii ∼5 mm, high endurance, and enhanced elastic limit compared to thin films of similar thickness and composition. The observed performance is corroborated by our micro-magnetic simulations and can be attributed to the reduced size and strong nanostructure-interfacial effects. Such stable magnetic nanowires with ultralow magnetostriction open up new opportunities for stable surface mountable and wearable spintronic sensors, advanced nanospintronic circuits, and for exploring novel strain-induced quantum effects in hybrid devices.
将磁电和自旋电子传感器集成到柔性电子器件中，为推动柔性和可穿戴技术发展带来了巨大潜力。磁性纳米线是构建此类器件的核心组件。因此，实现具有工程化磁弹性特性的柔性磁性纳米线是柔性自旋电子电路的关键，同时也为探索复杂的柔性自旋电子、磁子和磁等离子体器件开辟了独特途径。在此，我们首次展示了在透明柔性基板上具有高弹性的柔性铁磁纳米线。通过广泛的磁光克尔实验，探索维拉里效应，我们揭示了纳米线中极低的磁致伸缩常数，与块状材料的值相比降低了两个数量级。此外，与具有相似厚度和成分的薄膜相比，柔性磁性纳米线表现出显著的弹性，能够承受约5毫米的弯曲半径，具有高耐久性和增强的弹性极限。我们的微磁模拟证实了观察到的性能，这可归因于尺寸减小和强烈的纳米结构界面效应。这种具有超低磁致伸缩的稳定磁性纳米线为稳定的表面可安装和可穿戴自旋电子传感器、先进的纳米自旋电子电路以及探索混合器件中新型应变诱导量子效应开辟了新机遇。
