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Artificial Double-Helix for Geometrical Control of Magnetic Chirality.
ACS Nano ( IF 15.8 ) Pub Date : 2020-07-07 , DOI: 10.1021/acsnano.0c00720
Dédalo Sanz-Hernández 1, 2 , Aurelio Hierro-Rodriguez 3, 4, 5 , Claire Donnelly 1 , Javier Pablo-Navarro 6 , Andrea Sorrentino 7 , Eva Pereiro 7 , César Magén 6, 8 , Stephen McVitie 3 , José María de Teresa 6, 8 , Salvador Ferrer 7 , Peter Fischer 9, 10 , Amalio Fernández-Pacheco 1, 3
Affiliation  

Chirality plays a major role in nature, from particle physics to DNA, and its control is much sought-after due to the scientific and technological opportunities it unlocks. For magnetic materials, chiral interactions between spins promote the formation of sophisticated swirling magnetic states such as skyrmions, with rich topological properties and great potential for future technologies. Currently, chiral magnetism requires either a restricted group of natural materials or synthetic thin-film systems that exploit interfacial effects. Here, using state-of-the-art nanofabrication and magnetic X-ray microscopy, we demonstrate the imprinting of complex chiral spin states via three-dimensional geometric effects at the nanoscale. By balancing dipolar and exchange interactions in an artificial ferromagnetic double-helix nanostructure, we create magnetic domains and domain walls with a well-defined spin chirality, determined solely by the chiral geometry. We further demonstrate the ability to create confined 3D spin textures and topological defects by locally interfacing geometries of opposite chirality. The ability to create chiral spin textures via 3D nanopatterning alone enables exquisite control over the properties and location of complex topological magnetic states, of great importance for the development of future metamaterials and devices in which chirality provides enhanced functionality.

中文翻译:


用于磁手性几何控制的人工双螺旋。



手性在自然界中发挥着重要作用,从粒子物理学到 DNA,其控制因其释放的科学和技术机会而备受追捧。对于磁性材料,自旋之间的手性相互作用促进了复杂的旋转磁态的形成,例如斯格明子,具有丰富的拓扑特性和未来技术的巨大潜力。目前,手性磁性需要一组有限的天然材料或利用界面效应的合成薄膜系统。在这里,我们利用最先进的纳米加工和磁性 X 射线显微镜,通过纳米尺度的三维几何效应展示了复杂的手性自旋态的印记。通过平衡人造铁磁双螺旋纳米结构中的偶极相互作用和交换相互作用,我们创建了具有明确的自旋手性的磁畴和畴壁,仅由手性几何形状决定。我们进一步证明了通过局部连接相反手性几何形状来创建受限 3D 自旋纹理和拓扑缺陷的能力。仅通过3D 纳米图案创建手性自旋纹理的能力就可以精确控制复杂拓扑磁态的属性和位置,这对于未来超材料和设备的开发非常重要,其中手性提供增强的功能。
更新日期:2020-07-28
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