Spin-Polarized Current Driven Vortex-Pair Switching in a Magnetic Ellipse

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Abstract:

Micromagnetic simulations are performed to study the mechanism of vortex core reversal in a Permalloy elliptical element that contains two vortices with opposite polarities. A short current pulse is applied in the film plane along the short axis of the ellipse. The trajectories of the two vortex cores move either clockwise or anticlockwise, depending on the core polarization. Their reversal mechanisms of the two cores are the same through a creation-annihilation process of vortex–antivortex pair. By analyzing the partial energies of the sample we find that the core reversal occurs once the maximum local energy density reaches the threshold value (e.g., ∼3.0 × 106 J/m3 for Permalloy). Interestingly, this energy threshold is a universal constant, irrespective of the applied current strength, vortex polarity and the sample size.

Keywords: MAGNETIC VORTEX; MICROMAGNETIC SIMULATION; SPIN-TRANSFER TORQUE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.4271

Publication date: February 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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