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

Y. J. Choi; S. B. Kim; T. Asada; S. Park; Weida Wu; Y. Horibe; S-W. Cheong

doi:doi:10.1209/0295-5075/86/37012

All issues

Volume 86 / No 3 (May 2009)

EPL, 86 3 (2009) 37012

Abstract

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		https://doi.org/10.1209/0295-5075/86/37012
Published online		21 May 2009

EPL, 86 (2009) 37012

Giant magnetic coercivity and ionic superlattice nano-domains in Fe_0.25TaS₂

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: 20 April 2009

Abstract

We have explored giant magnetic coercivity (H_c ≈ 7 tesla) in the highly anisotropic ferromagnet of Fe_0.25TaS₂ 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 H_c, 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

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