Issue
EPL
Volume 86, Number 3, May 2009
Article Number 37012
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/37012
Published online 21 May 2009
EPL, 86 (2009) 37012
DOI: 10.1209/0295-5075/86/37012

Giant magnetic coercivity and ionic superlattice nano-domains in Fe0.25TaS2

Y. J. Choi1, S. B. Kim2, T. Asada3, S. Park1, Weida Wu1, Y. Horibe1 and S-W. Cheong1, 2

1   Rutgers Center for Emergent Materials and Department of Physics & Astronomy - 136 Frelinghuysen Road, Piscataway, NJ, 08854, USA
2   Laboratory of Pohang Emergent Materials and Department of Physics, Pohang University of Science and Technology - Pohang 790-784, Korea
3   Research Department, NISSAN ARC, LTD. - Yokosuka, Kanagawa 237-0061, Japan


received 13 January 2009; accepted in final form 20 April 2009; published May 2009
published online 21 May 2009

Abstract
We have explored giant magnetic coercivity (Hc $\approx$ 7 tesla) in the highly anisotropic ferromagnet of Fe0.25TaS2 through harnessing order of Fe2+ ions intercalated in-between TaS2 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 magnetic domain configurations and huge enhancement of Hc, probably through efficient magnetic domain wall pinning by nano-size superlattice domains.

PACS
75.50.Vv - High coercivity materials.
75.50.Ww - Permanent magnets.
75.30.Gw - Magnetic anisotropy.

© EPLA 2009