3D Nanomagnetism in Low Density Interconnected Nanowire Networks

• DOI: 10.1021/acs.nanolett.0c04366
• Publication Date: 2020-12-11T18:53:00Z
• Authors: Edward C. Burks; Dustin A. Gilbert; Peyton D. Murray; Chad Flores; Thomas E. Felter; Supakit Charnvani...; Sergei O. Kucheyev; Jeffrey D. Colvin; Gen Yin; Kai Liu
• Keywords: 3D information storage; Condensed Matter - Materials Science; Condensed Matter - Mesoscale and Nanoscale Physics; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 02 engineering and technology; 530; multistate magnetic configurations; 3D nanomagnetism; cond-mat.mtrl-sci; 620; Engineering; nanowire networks; cond-mat.mes-hall; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Nanotechnology; Nanoscience & Nanotechnology; 0210 nano-technology

24 pages, 4 figures; 3 page Supporting Information with 1 figure. Nano Letters (2020)<br/>Free-standing, interconnected metallic nanowire networks with density as low as 40 mg/cm^{3} have been achieved over cm-scale areas, using electrodeposition into polycarbonate membranes that have been ion-tracked at multiple angles. Networks of interconnected magnetic nanowires further provide an exciting platform to explore 3-dimensional nanomagnetism, where their structure, topology and frustration may be used as additional degrees of freedom to tailor the materials properties. New magnetization reversal mechanisms in cobalt networks are captured by the first-order reversal curve method, which demonstrate the evolution from strong demagnetizing dipolar interactions to intersections-mediated domain wall pinning and propagation, and eventually to shape-anisotropy dominated magnetization reversal. These findings open up new possibilities for 3-dimensional integrated magnetic devices for memory, complex computation, and neuromorphics.<br/>