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Title: Interplay between bulk and edge-bound topological defects in a square micromagnet

A field-driven transformation of a domain pattern in a square micromagnet, defined in a thin film of La 0.7Sr 0.3MnO 3, is discussed in terms of creation and annihilation of bulk vortices and edge-bound topological defects with half-integer winding numbers. The evolution of the domain pattern was mapped with soft x-ray photoemission electron microscopy and magnetic force microscopy. Micromagnetic modeling, permitting detailed analysis of the spin texture, accurately reproduces the measured domain state transformation. The simulations also helped stipulate the energy barriers associated with the creation and annihilation of the topological charges and thus to assess the stability of the domain states in this magnetic microstructure.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [3] ;  [1] ;  [1]
  1. Norwegian Univ. of Science and Technology, Trondheim (Norway). Dept. of Electronic Systems
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source; Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 221860/F60
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 4; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Norwegian Univ. of Science and Technology, Trondheim (Norway); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE; Research Council of Norway
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; materials; ferromagnetism; microscopy; magnetism; magnetic ordering; chemical analysis; electron microscopy; magnetic force microscopy; photoemission electron microscopy; materials analysis
OSTI Identifier:
1427590