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Title: Thin films of the spin ice compound Ho{sub 2}Ti{sub 2}O{sub 7}

The pyrochlore compounds Ho{sub 2}Ti{sub 2}O{sub 7} and Dy{sub 2}Ti{sub 2}O{sub 7} show an exotic form of magnetism called the spin ice state, resulting from the interplay between geometrical frustration and ferromagnetic coupling. A fascinating feature of this state is the appearance of magnetic monopoles as emergent excitations above the degenerate ground state. Over the past years, strong effort has been devoted to the investigation of these monopoles and other properties of the spin ice state in bulk crystals. Here, we report the fabrication of Ho{sub 2}Ti{sub 2}O{sub 7} thin films using pulsed laser deposition on yttria-stabilized ZrO{sub 2} substrates. We investigated the structural properties of these films by X-ray diffraction, scanning transmission electron microscopy, and atomic force microscopy, and the magnetic properties by vibrating sample magnetometry at 2 K. The films not only show a high crystalline quality, but also exhibit the hallmarks of a spin ice: a pronounced magnetic anisotropy and an intermediate plateau in the magnetization along the [111] crystal direction.
Authors:
; ; ;  [1] ; ;  [2] ;  [2] ;  [3]
  1. MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede (Netherlands)
  2. Electron Microscopy for Materials Science (EMAT), Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp (Belgium)
  3. (Belgium)
Publication Date:
OSTI Identifier:
22269552
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 3; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMIC FORCE MICROSCOPY; CRYSTALS; DYSPROSIUM COMPOUNDS; ENERGY BEAM DEPOSITION; FABRICATION; GROUND STATES; LASER RADIATION; MAGNETIC MONOPOLES; MAGNETIC PROPERTIES; MAGNETIZATION; PULSED IRRADIATION; PYROCHLORE; SPIN; SUBSTRATES; THIN FILMS; TITANATES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; YTTRIUM OXIDES; ZIRCONIUM OXIDES