Helical spin structure of 1D chains with hybridized boundaries

ORAL

Abstract

We have synthesized and studied quantitatively the structure and magnetic properties of ultra-short 1D Fe chains subject to various boundary conditions. The length of Fe chains are controlled by using iron phthalocyanine(FePc) thin films and FePc/ metal-free phthalocyanine(H2Pc) superlattices(SLs). Their boundary conditions are controlled by electronic hybridization at the end of the chains. The local bonding environment was determined from element selective XAS, and the angular dependence of Spin and orbital moment was resolved by XMCD. DFT calculations provided a fundamental understanding of the structural and electronic properties of 1D Fe chains subject to different electronic environments. The coercive field increases with the iron chain length with hybridized boundaries, whereas in chains not subject to hybridization the coercive field remains constant. The slow magnetic relaxation of 1D Fe chains at different freezing temperatures was extracted from the magnetic remanence evolution with time. A quantitative, semi-classical model based on the DMI, implies the presence of an unusual Helical spin structure which arises from hybridized boundaries

*National Science Foundation under Grant 1804414 and 1805585, and AFOSR Grant FA9550-16-1-0122. LLNL under Contract DE-AC52-07NA27344

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Presenters

  • Nicolas M Vargas

    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Department of Physics, University of California San Diego

Authors

  • Nicolas M Vargas

    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Department of Physics, University of California San Diego

  • Alexander Baker

    • Condensed Matter and Materials Division, Lawrence Livermore National Laboratory

  • Felipe Torres

    • Physics, Universidad de Chile

  • Roman Pico

    • Institute of Physics, National University of Rosario, Argentina

  • Jonathan R.I. Lee

    • Condensed Matter and Materials Division, Lawrence Livermore National Laboratory

  • Ignacio Hamad

    • Institute of Physics, National University of Rosario, Argentina

  • Paula Abufager

    • Institute of Physics, National University of Rosario, Argentina

  • Miguel G Kiwi

    • Physics, Universidad de Chile

  • Trevor M Willey

    • Lawrence Livermore Natl Lab
    • Condensed Matter and Materials Division, Lawrence Livermore National Laboratory

  • Carlos Monton

    • General Atomics, San Diego

  • Ivan Schuller

    • University of California, San Diego
    • Dept. of Physics and Center for Advanced Nanoscience, UCSD, La Jolla, CA, USA
    • Physics Department, University of California, San Diego
    • Department of Physics, University of California, San Diego