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Title: A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks: distorted viscous vortex

Magnetic vortices have generated intense interest in recent years due to their unique reversal mechanisms, fascinating topological properties, and exciting potential applications. In addition, the exchange coupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novel phenomena and functionalities. Here we report a new magnetization reversal mode of magnetic vortices in exchange coupled Ir20Mn80/Fe20Ni80 microdots: distorted viscous vortex reversal. In contrast to the previously known or proposed reversal modes, the vortex is distorted close to the interface and viscously dragged due to the uncompensated spins of a thin antiferromagnet, which leads to unexpected asymmetries in the annihilation and nucleation fields. Lastly, these results provide a deeper understanding of the physics of exchange coupled vortices and may also have important implications for applications involving exchange coupled nanostructures.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5] ;  [6] ;  [3] ;  [7] ;  [1] ;  [8]
  1. Univ. of California, Davis, CA (United States)
  2. Universitat de Barcelona (Spain)
  3. Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain)
  4. Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain); ICN2 - Institut Catala de Nanociencia is Nanotechnologia, Bellaterra (Barcelona) (Spain)
  5. Colorado State Univ., Fort Collins (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain); Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain)
  8. Univ. Autonoma de Barcelona, Bellaterra (Barcelona) (Spain); ICN2 - Institut Catala de Nanociencia is Nanotechnologia, Bellaterra (Barcelona) (Spain); Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona (Spain)
Publication Date:
OSTI Identifier:
1214389
Grant/Contract Number:
AC02-06CH11357; 2014-SGR-1015; ECCS-1232275; DMR-1008791; 11328402
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 7; Journal Issue: 21; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY