Two-photon lithography for 3D magnetic nanostructure fabrication  

作　　者：Gwilym Williams  Matthew Hunt  Benedikt Boehm  Andrew May  Michael Taverne  Daniel Ho  Sean Giblin  Dan Read  John Rarity  Rolf Allenspach  Sam Ladak 

机构地区：[1]School of Physics and Astronomy Cardiff University Cardiff UK [2]IBM Research - Zurich Rüschlikon Switzerland [3]Department of Electrical and Electronic Engineering University of Bristol Bristol UK

出　　处：《Nano Research》2018年第2期845-854,共10页纳米研究（英文版）

摘　　要：Ferromagnetic materials have been utilized as recording media in data storage devices for many decades. The confinement of a material to a two-dimensional plane is a significant bottleneck in achieving ultra-high recording densities, and this has led to the proposition of three-dimensional （3D） racetrack memories that utilize domain wall propagation along the nanowires. However, the fabrication of 3D magnetic nanostructures of complex geometries is highly challenging and is not easily achieved with standard lithography techniques. Here, we demonstrate a new approach to construct 3D magnetic nanostructures of complex geometries using a combination of two-photon lithography and electrochemical deposition. The magnetic properties are found to be intimately related to the 3D geometry of the structure, and magnetic imaging experiments provide evidence of domain wall pinning at the 3D nanostructured junction.Ferromagnetic materials have been utilized as recording media in data storage devices for many decades. The confinement of a material to a two-dimensional plane is a significant bottleneck in achieving ultra-high recording densities, and this has led to the proposition of three-dimensional （3D） racetrack memories that utilize domain wall propagation along the nanowires. However, the fabrication of 3D magnetic nanostructures of complex geometries is highly challenging and is not easily achieved with standard lithography techniques. Here, we demonstrate a new approach to construct 3D magnetic nanostructures of complex geometries using a combination of two-photon lithography and electrochemical deposition. The magnetic properties are found to be intimately related to the 3D geometry of the structure, and magnetic imaging experiments provide evidence of domain wall pinning at the 3D nanostructured junction.

关 键 词：MAGNETISM SPINTRONICS nanomagnefism three-dimensional （3D）lithography 

分 类 号：O484[理学—固体物理] O482.523[理学—物理]