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Abstract
A method to optimize the topology of hard as well as soft magnetic structures is implemented using the density approach for topology optimization. The stray field computation is performed by a hybrid finite element–boundary element method. Utilizing the adjoint approach the gradients necessary to perform the optimization can be calculated very efficiently. We derive the gradients using a “first optimize then discretize” scheme. Within this scheme, the stray field operator is self-adjoint allowing to solve the adjoint equation by the same means as the stray field calculation. The capabilities of the method are showcased by optimizing the topology of hard as well as soft magnetic thin film structures and the results are verified by comparison with an analytical solution.
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Details
1 University of Vienna, Faculty of Physics, Vienna, Austria (GRID:grid.10420.37) (ISNI:0000 0001 2286 1424)
2 University of Vienna, Faculty of Physics, Vienna, Austria (GRID:grid.10420.37) (ISNI:0000 0001 2286 1424); University of Vienna, Research Platform MMM Mathematics-Magnetism-Materials, Vienna, Austria (GRID:grid.10420.37) (ISNI:0000 0001 2286 1424)