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Title: Strong vortex core pinning and Barkhausen-free magnetization response in thin Permalloy disks induced by implantation of 1 × 10{sup 4} Ga{sup +} ions

Artificial vortex core pinning sites are induced in thin Permalloy disks by point exposure to as few as 10 000 ions from a focused Ga{sup +} beam. These pinning sites yield a first-order change in the magnetization response of the disk. A single site can keep the vortex core pinned over an applied field range comparable to the vortex annihilation field of the unaltered disk. Several widely separated sites can work together to keep the core pinned in one place, while the Barkhausen effect is eliminated from the magnetization curve over a range approaching the saturation moment of the disk.
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Department of Physics, University of Alberta, Edmonton, Alberta T6G 2G7 (Canada)
  2. (NINT), Edmonton, Alberta T6G 2M9 (Canada)
  3. National Institute for Nanotechnology (NINT), Edmonton, Alberta T6G 2M9 (Canada)
Publication Date:
OSTI Identifier:
22273829
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; GALLIUM IONS; ION BEAMS; ION IMPLANTATION; MAGNETIC FLUX; MAGNETIZATION; PERMALLOY; PHYSICAL RADIATION EFFECTS; VORTICES