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

Journal Article · Mon Feb 03 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4864275· OSTI ID:22283228

Rückriem, R.; Schrefl, T. ^[1]

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1. St. Pölten University of Applied Science, 3100 St. Pölten (Austria)

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.

• OSTI ID: 22283228
• Journal Information: Applied Physics Letters, Vol. 104, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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