Micromagnetic simulations of ferromagnetic rings
Journal of Applied Physics, ISSN: 0021-8979, Vol: 103, Issue: 7
2008
- 7Citations
- 13Captures
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Conference Paper Description
Thin nanomagnetic rings have generated interest for fundamental studies of magnetization reversal and also for their potential in various applications, particularly as magnetic memories. They are a rare example of a geometry in which an analytical solution for the rate of thermally induced magnetic reversal has been determined, in an approximation whose errors can be estimated and bounded. In this work, numerical simulations of soft ferromagnetic rings are used to explore aspects of the analytical solution. The evolution of the energy near the transition states confirms that, consistent with analytical predictions, thermally induced magnetization reversal can have one of two intermediate states: either constant or solitonlike saddle configurations, depending on ring size and externally applied magnetic field. The results confirm analytical predictions of a transition in thermally activated reversal behavior as magnetic field is varied at constant ring size. Simulations also show that the analytic one-dimensional model continues to hold even for wide rings. © 2008 American Institute of Physics.
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