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Title: Nanoscale Skyrmions in a Nonchiral Metallic Multiferroic: Ni 2MnGa

Magnetic skyrmions belong to a set of topologically nontrivial spin textures at the nanoscale that have received increased attention due to their emergent behavior and novel potential spintronic applications. Discovering materials systems that can host skyrmions at room temperature in the absence of external magnetic field is of crucial importance not only from a fundamental aspect, but also from a technological point of view. So far, the observations of skyrmions in bulk metallic ferromagnets have been limited to low temperatures and to materials that exhibit strong chiral interactions. In this paper, we show the formation of nanoscale skyrmions in a nonchiral multiferroic material, which is ferromagnetic and ferroelastic, Ni 2MnGa at room temperature without the presence of external magnetic fields. By using Lorentz transmission electron microscopy in combination with micromagnetic simulations, we elucidate their formation, behavior, and stability under applied magnetic fields at room temperature. Finally, the formation of skyrmions in a multiferroic material with no broken inversion symmetry presents new exciting opportunities for the exploration of the fundamental physics of topologically nontrivial spin textures.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
AC02-06CH11357; DMR-1306296
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 7; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Contributing Orgs:
Northwestern Univ., Evanston, IL (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Lorentz transmission electron microscopy; multiferroic material; Skyrmions
OSTI Identifier:
1352682