Magnetization characteristics of submicron-sized ferromagnetic rings in a one-dimensional array with various inter-ring distances, , were investigated by the magneto-optical Kerr effect and micromagnetic simulation. The onion (vortex)-to-vortex (onion) transition fields were found to be proportional to with (0.79), instead of being a simple dipole interaction model . It was demonstrated that the transition mechanism and the inter-ring dependence are governed by the energy gain originating from the deformation of the local vortex. As a result, exchange energy as well as magnetostatic energy play important roles in the magnetization reversal of ring array.
Magnetic interaction of submicron-sized ferromagnetic rings in one-dimensional array
T. Miyawaki, K. Toyoda, M. Kohda, A. Fujita, J. Nitta; Magnetic interaction of submicron-sized ferromagnetic rings in one-dimensional array. Appl. Phys. Lett. 18 September 2006; 89 (12): 122508. https://doi.org/10.1063/1.2354584
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