Magnetic X-ray microscopy with orbital angular momentum beams

Oral-In-person  · Withdrawn

Abstract

As a routine spectroscopic method for characterizing magnetic materials, X-ray Magnetic Circular Dichroism (XMCD) relies upon the differential absorption of light with opposed Spin Angular Momentum (SAM) to provide element-specific magnetic information. The recent availability of coherent X-rays with well-defined Orbital Angular Momentum (OAM) provides another degree of freedom with which to achieve differential absorption of X-rays. The distinct spatial structure of OAM beams imparts spatial structure on the XMCD process, as seen in Scanning Transmission X-ray Microscopy (STXM) experiments with beams bearing specific SAM & OAM. Simulations of STXM image formation with OAM beams provide good agreement with experiment and suggest a strategy for the extraction of magnetic information beyond the 1-D projection of the sample magnetization already accessible by standard XMCD experiments.

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Presenters

  • Ryan Evenson

    • Lawrence Berkeley National Laboratory

Authors

  • Ryan Evenson

    • Lawrence Berkeley National Laboratory

  • Johnny Ho

  • Bernhard Luttgenau

  • Hendrik Ohldag

    • Lawrence Berkeley National Laboratory

  • Weilun Chao

    • Lawrence Berkeley National Laboratory

  • Sophie Morley

    • Lawrence Berkeley National Laboratory

  • Margaret McCarter

  • David Prendergast

    • Lawrence Berkeley National Laboratory

  • Sujoy Roy

    • Lawrence Berkeley National Laboratory