X-ray Orbital Angular Momentum from Artificial Antiferromagnets containing Edge Dislocations

ORAL

Abstract

Artificial spin lattices (ASLs), including artificial spin ices, consist of patterned magnetic nanostructures that mimic Ising spins. Here we show that a permalloy, square ASL with a double edge dislocation exhibits an ordered antiferromagnetic ground state, unlike square ASLs with a single dislocation.1 We demonstrate that soft x-rays resonantly scattered from this magnetic texture carry orbital angular momentum. Moreover, x-ray OAM from these samples can be modulated using and temperature and applied magnetic fields. X-ray beams carrying orbital angular momentum (OAM) have potential applications in nanoscale imaging, spectroscopy, and manipulation, but current means of generating x-ray OAM are difficult to modulate or reconfigure.2 Scattering from ASLs may offer a potential path to flexible control of x-ray OAM.

1 Drisko et al. Topological frustration of artificial spin ice, Nature Communications (2017).
2 Lee et al., Laguerre–Gauss and Hermite–Gauss soft X-ray states generated using diffractive optics, Nature Photonics (2019).

*U.S. Department of Energy DE-SC0016519
Advanced Light Source, DOE DE-AC02-05CH11231
National Synchrotron Light Source II, DOE DE-SC0012704
National Nanotechnology Coordinated Infrastructure, NSF ECCS-1542164
Center for Nanoscale Materials, DOE DE-AC02-06CH11357

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Presenters

  • Jeffrey Hastings

    • University of Kentucky

Authors

  • Xiaoqian Chen

    • Lawrence Berkeley National Laboratory

  • Justin Woods

    • Univ of Kentucky
    • University of Kentucky

  • Roland Koch

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source

  • Barry W Farmer

    • Univ of Kentucky
    • University of Kentucky

  • Claudio Mazzoli

    • Brookhaven National Laboratory
    • Brookhaven National Lab.

  • Wen Hu

    • Brookhaven National Laboratory
    • Brookhaven National Lab.

  • Rajesh V Chopdekar

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Wai-Kwong Kwok

    • Argonne National Laboratory
    • Material Sciences, Argonne National Laboratory
    • Argonne Natl Lab
    • Materials Science Division, Argonne National Laboratory
    • Materials Science Division, Argonne Natl Lab
    • Argonne National Lab

  • Lance Eric De Long

    • Univ of Kentucky
    • University of Kentucky

  • Sujoy Roy

    • Lawrence Berkeley National Laboratory

  • Jeffrey Hastings

    • University of Kentucky