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Title: Ultra-fast magnetic vortex core reversal by a local field pulse

Magnetic vortex core reversal of a 20-nm-thick permalloy disk with a diameter of 100 nm was studied by micromagnetic simulations. By applying a global out-of-plane magnetic field pulse, it turned out that the final core polarity is very sensitive to pulse width and amplitude, which makes it hard to control. The reason for this phenomenon is the excitation of radial spin waves, which dominate the reversal process. The excitation of spin waves can be strongly suppressed by applying a local field pulse within a small area at the core center. With this approach, ultra-short reversal times of about 15 ps were achieved, which are ten times faster compared to a global pulse.
Authors:
;  [1] ;  [2]
  1. Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz (Germany)
  2. St. Pölten University of Applied Science, 3100 St. Pölten (Austria)
Publication Date:
OSTI Identifier:
22283228
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 5; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; EXCITATION; MAGNETIC FIELDS; MAGNETISM; NANOSTRUCTURES; PERMALLOY; PULSES; SPIN WAVES; VORTICES