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Title: Magnetic vortex crystal formation in the antidot complement of square artificial spin ice

We have studied ferromagnetic nickel thin films patterned with square lattices of elongated antidots that are negative analogues of square artificial spin ice. Micromagnetic simulations and direct current magnetic moment measurements reveal in-plane anisotropy of the magnetic hysteresis loops, and the formation of a dense array of magnetic vortices with random polarization and chirality. These multiply-connected antidot arrays could be superior to lattices of disconnected nanodisks for investigations of vortex switching by applied electric current.
Authors:
; ; ; ; ; ; ;  [1] ;  [2]
  1. Departamento de Física, Universidade Federal de Viçosa, Viçosa 36570-900, Minas Gerais (Brazil)
  2. Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Minas Gerais (Brazil)
Publication Date:
OSTI Identifier:
22283075
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; 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; ANISOTROPY; CHIRALITY; CRYSTALS; DIRECT CURRENT; FERROMAGNETISM; HYSTERESIS; MAGNETIC FLUX; MAGNETIC MOMENTS; NICKEL; POLARIZATION; RANDOMNESS; SIMULATION; SPIN; TETRAGONAL LATTICES; THIN FILMS; VORTICES