Thin Film Magnetism Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge UK, CB3 0HE.
Published: April 2014
AI Article Synopsis
Article Abstract
Control of the motion of domain walls in magnetic nanowires is at the heart of various recently proposed three-dimensional (3D) memory devices. However, fabricating 3D nanostructures is extremely complicated using standard lithography techniques. Here we show that highly pure 3D magnetic nanowires with aspect-ratios of ~100 can be grown using focused electron-beam-induced-deposition. By combining micromanipulation, Kerr magnetometry and magnetic force microscopy, we determine that the magnetisation reversal of the wires occurs via the nucleation and propagation of domain walls. In addition, we demonstrate that the magnetic switching of individual 3D nanostructures can be directly probed by magneto-optical Kerr effect.
We present a sequential growth scheme based on pulsed laser deposition, which yields dense arrays of ultrathin, match-shaped Au/CoNi nanopillars, vertically embedded in SrTiOthin films. Analysis of the magnetic properties of these nanocomposites reveals a pronounced out-of-plane anisotropy. We show that the latter not only results from the peculiar nanoarchitecture of the hybrid films but is further enhanced by strong magneto-structural coupling of the wires to the surrounding matrix.
Researchers are working on creating synthetic soft materials that mimic living organisms' behaviors, specifically those that can sense and adapt to their environments.
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The findings showcase the potential of using hybrid polymers that combine supramolecular and covalent structures to develop intelligent systems that can autonomously react to their surroundings.
The transition from planar (2D) to three-dimensional (3D) magnetic nanostructures represents a significant advancement in both fundamental research and practical applications, offering vast potential for next-generation technologies like ultrahigh-density storage, memory, logic, and neuromorphic computing. Despite being a relatively new field, the emergence of 3D nanomagnetism presents numerous opportunities for innovation, prompting the creation of a comprehensive roadmap by leading international researchers. This roadmap aims to facilitate collaboration and interdisciplinary dialogue to address challenges in materials science, physics, engineering, and computing.
- The study explores how axonal growth can be influenced by both the physical environment, such as magnetic fields and materials, and the genetic mechanisms involved, using a new ferromagnetic composite material called glass-coated magnetic microwire.
- Researchers cultured rat dorsal root ganglia (DRG) under different conditions to analyze neurite outgrowth, discovering that combining magnetic stimulation with the microwire significantly increased both total neurite growth and directed growth compared to control conditions.
- RNA sequencing showed that the combination of the magnetic field and microwire reduced the expression of certain immune-response-related genes, hinting at how physical stimulation could guide axon growth and improve our understanding of tissue interactions.
Si-based anodes can increase specific energy and energy density of Li ion batteries. However, the volume-induced material stress and capacity loss necessitates only a partial Si utilization within composite anodes, typically with state-of-the-art graphite, so called Si/Gr composites. In this work, various Si nanowires (SiNWs), a promising Si architecture for these composites, are investigated and modified via pre-lithiation.
