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Title: Effects of exchange bias on magnetotransport in permalloy kagome artificial spin ice

We investigate the magnetotransport properties of connected kagome artificial spin ice networks composed of permalloy nanowires. Our data show clear evidence of magnetic switching among the wires, both in the longitudinal and transverse magnetoresistance. An unusual asymmetry with field sweep direction appears at temperatures below about 20 K that appears to be associated with exchange bias resulting from surface oxidation of permalloy, and which disappears in alumina-capped samples. These results demonstrate that exchange bias is a phenomenon that must be considered in understanding the physics of such artificial spin ice systems, and that opens up new possibilities for their control.
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  2. Pennsylvania State Univ., University Park, PA (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States); Univ. of Cambridge (United Kingdom). Cavendish Lab.
  4. Univ. of Minnesota, Minneapolis, MN (United States)
  5. Univ. of Illinois at Urbana-Champaign, Urbana, IL (US)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 2; Journal ID: ISSN 1367-2630
IOP Publishing
Research Org:
Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE artificial spin ice; exchange bias; magnetotransport