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Title: Magnetic spin states and vortex stability control in elongated Ni 80Fe20 nanorings
Authors: Ren, Y.
Adeyeye, A.O. 
Issue Date: 2009
Citation: Ren, Y., Adeyeye, A.O. (2009). Magnetic spin states and vortex stability control in elongated Ni 80Fe20 nanorings. Journal of Applied Physics 105 (6) : -. ScholarBank@NUS Repository.
Abstract: We present the results of a systematic characterization of the magnetization reversal mechanism of arrays of elongated Ni80 Fe20 nanorings using focused magneto-optical Kerr effect measurements. The long axis of the rings was varied from 850 nm to 1.60 μm while the aspect ratio, ring width, and thickness were fixed at 2, 150 nm, and 25 nm, respectively. We observed an increase in the range of stability of the intermediate vortex state with both increasing length (l) of the ring and varying field orientations. Interestingly, for l he reversal process drastically changes from a two-step switching to a single step switching without the formation of a vortex state and from a one-step switching to a double step switching with the formation of a vortex state when the applied field is (±5°) away from the easy and hard axes of the ring, respectively. There is a good agreement between the experimental results and micromagnetic simulations. © 2009 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.3093894
Appears in Collections:Staff Publications

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