Giant magnetic coercivity and nano-domains in Fe$_{0.25}$TaS$_2$

ORAL

Abstract

We have explored giant magnetic coercivity (H$_c \sim$ 7 tesla) in the highly anisotropic ferromagnet of Fe$_{0.25}$TaS$_2$ through harnessing order of Fe$^{2+}$ ions intercalated in-between TaS$_2$ layers. Fe ions order well in annealed crystals and form a (1/2,0,0) superlattice. However, a (1/3,1/3,0) superlattice, in addition to the (1/2,0,0) superlattice, can form in quenched crystals. These coexisting superlattices with nano-size domains result in significant change of zero-field-cooled magnetic domain configurations and huge enhancement of H$_c$, probably through efficient magnetic domain wall pinning by nano-size superlattice domains.\footnote{Y.J. Choi, et al, EuroPhys. Lett., 86, 37012 (2009).}

*Work at Rutgers is supported by NSF-DMR-0844807 and NSF-DMR-0804109

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Authors

  • Young Jai Choi

    • Rutgers University

  • Weida Wu

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ
    • Rutgers University
    • Rutgers Center for Emergent Materials \& Department of Physics and Astronomy, Rutgers University

  • S. Park

  • Y. Horibe

    • Rutgers University
    • Rutgers Center for Emergent Materials \& Department of Physics and Astronomy, Rutgers University

  • S.-W. Cheong

    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854
    • Rutgers Center for Emergent Materials
    • Rutgers University
    • Department of Physics, Rutgers Univeristy
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
    • Rutgers Center for Emergent Materials \& Department of Physics and Astronomy, Rutgers University

  • S.B. Kim

    • Laboratory of Pohang Emergent Materials and Department of Physics, Pohang University of Science and Technology - Pohang 790-784, South Korea

  • T. Asada

    • Department, NISSAN ARC, LTD. - Yokosuka, Kanagawa 237-0061, Japan