Helical and skyrmion phases in amorphous Fe-Ge thick films

ORAL

Abstract

Magnetic skyrmions are topologically protected solitons with the potential to revolutionize future spintronics and computing due to its low energy cost of manipulation. Skyrmion phase, now found in various single crystals including ferrimagnet FeGe, has recently predicted to also manifest in vector spin frustrated amorphous films. We studied amorphous Fe-Ge films using coherent resonant soft x-ray scattering. We observed magnetic Bragg peaks associated with the helical and skyrmion periodicity and mapped out their field-temperature phase diagram. We also observed spontaneous dynamics for a large range of temperatures. We calculate the respective one-time correlation functions of this fluctuation, whose characteristic curvatures indicate the distinct dynamical behavior of the helical and skyrmion textures.

*This work was primarily funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 within the NEMM program (MSMAG).

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Presenters

  • Xiaoqian Chen

    • Lawrence Berkeley National Laboratory

Authors

  • Xiaoqian Chen

    • Lawrence Berkeley National Laboratory

  • Robert Streubel

    • Lawrence Berkeley National Laboratory

  • Dinah Simone Bouma

    • Physics, University of California, Berkeley
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory
    • University of California Berkeley
    • University of California, Berkeley and Lawrence Berkeley National Laboratory

  • Roland Koch

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

  • Stephen Douglas Kevan

    • Lawrence Berkeley National Laboratory

  • Frances Hellman

    • Physics, University of California, Berkeley
    • University of California, Berkeley
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory
    • University of California Berkeley
    • University of California, Berkeley and Lawrence Berkeley National Laboratory

  • Peter Fischer

    • Lawrence Berkeley National Laboratory

  • Sujoy Roy

    • Lawrence Berkeley National Laboratory