Journal
NANO LETTERS
Volume 21, Issue 1, Pages 716-722Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04366
Keywords
3D nanomagnetism; nanowire networks; multistate magnetic configurations; 3D information storage
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Funding
- NSF [ECCS-1611424, ECCS-1933527]
- DTRA [BRCALL08-Per3-C-2-0006]
- SMART - National Institute of Standards and Technology (NIST) [2018-NE-2861]
- U.S. DOE [DE-AC52-07NA27344]
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This study achieved free-standing, interconnected metallic nanowire networks with low density, and proposed a new research direction in exploring 3-dimensional nanomagnetism and magnetization reversal mechanisms. These findings provide new possibilities for developing 3-dimensional integrated magnetic devices for various applications.
Free-standing, interconnected metallic nanowire networks with densities as low as 40 mg/cm(3) have been achieved over centimeter-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 intersection-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.
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