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23. The finite element simulation is conducted by using commercial software COMSOL Multiphysics, http://www.comsol.com/ and AC/DC model has been chosen to simulate the static magnetic field, , External feld boundary condition has been used to mimic a unifor-m background static magnetic field from the outside of the, domain imposed onto the designed device. For the mesh size, we have used more than 10000 elements per square meter in, each case of our simulations.