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首页> 外文期刊>Advanced Science >A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices
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A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

机译：柔性自旋电子器件中纳米级外延锂铁氧体中弯曲弯曲耦合微波磁场的调制策略

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With the development of flexible electronics, the mechanical flexibility of functional materials is becoming one of the most important factors that needs to be considered in materials selection. Recently, flexible epitaxial nanoscale magnetic materials have attracted increasing attention for flexible spintronics. However, the knowledge of the bending coupled dynamic magnetic properties is poor when integrating the materials in flexible devices, which calls for further quantitative analysis. Herein, a series of epitaxial LiFe 5 O 8 (LFO) nanostructures are produced as research models, whose dynamic magnetic properties are characterized by ferromagnetic resonance (FMR) measurements. LFO films with different crystalline orientations are discussed to determine the influence from magnetocrystalline anisotropy. Moreover, LFO nanopillar arrays are grown on flexible substrates to reveal the contribution from the nanoscale morphology. It reveals that the bending tunability of the FMR spectra highly depends on the demagnetization field energy of the sample, which is decided by the magnetism and the shape factor in the nanostructure. Following this result, LFO film with high bending tunability of microwave magnetic properties, and LFO nanopillar arrays with stable properties under bending are obtained. This work shows guiding significances for the design of future flexible tunable/stable microwave magnetic devices.
机译：随着柔性电子技术的发展，功能材料的机械柔性正成为材料选择中最重要的因素之一。近来，柔性外延纳米级磁性材料已经对柔性自旋电子学引起了越来越多的关注。但是，将材料集成到柔性设备中时，弯曲耦合动态磁性能的知识很差，这需要进一步的定量分析。在此，制备了一系列的外延LiFe 5 O 8（LFO）纳米结构作为研究模型，其动态磁性能通过铁磁共振（FMR）测量来表征。讨论了具有不同晶体取向的LFO膜，以确定磁晶各向异性的影响。此外，LFO纳米柱阵列在柔性基板上生长，以揭示纳米级形态的贡献。结果表明，FMR光谱的弯曲可调性很大程度上取决于样品的退磁场能，而退磁场能由纳米结构中的磁性和形状因子决定。根据该结果，获得了具有微波磁性的高弯曲可调性的LFO膜和在弯曲下具有稳定的性能的LFO纳米柱阵列。这项工作表明了对未来柔性可调谐/稳定微波磁器件设计的指导意义。

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