Journal Article

FZJ-2020-02732

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Visualizing Magnetic Structure in 3D Nanoscale Ni–Fe Gyroid Networks

Llandro, J. (Corresponding author) ; Love, D. M. ; Kovács, A.FZJ* ; Caron, J.FZJ* ; Vyas, K. N. ; Kákay, A. ; Salikhov, R. ; Lenz, K. ; Fassbender, J. ; Scherer, M. R. J. ; Cimorra, C. ; Steiner, U. ; Barnes, C. H. W. ; Dunin-Borkowski, R. E.FZJ* ; Fukami, S. ; Ohno, H.

2020
ACS Publ. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/25634  doi:10.1021/acs.nanolett.0c00578

Abstract: Arrays of interacting 2D nanomagnets display unprecedented electromagnetic properties via collective effects, demonstrated in artificial spin ices and magnonic crystals. Progress toward 3D magnetic metamaterials is hampered by two challenges: fabricating 3D structures near intrinsic magnetic length scales (sub-100 nm) and visualizing their magnetic configurations. Here, we fabricate and measure nanoscale magnetic gyroids, periodic chiral networks comprising nanowire-like struts forming three-connected vertices. Via block copolymer templating, we produce Ni75Fe25 single-gyroid and double-gyroid (an inversion pair of single-gyroids) nanostructures with a 42 nm unit cell and 11 nm diameter struts, comparable to the exchange length in Ni–Fe. We visualize their magnetization distributions via off-axis electron holography with nanometer spatial resolution and interpret the patterns using finite-element micromagnetic simulations. Our results suggest an intricate, frustrated remanent state which is ferromagnetic but without a unique equilibrium configuration, opening new possibilities for collective phenomena in magnetism, including 3D magnonic crystals and unconventional computing.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. 3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538) (856538)
3. IMAGINE - Imaging Magnetism in Nanostructures using Electron Holography (320832) (320832)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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