Binary Ferromagnetic Nanostructures: Fabrication, Static and Dynamic Properties

The fabrication of large area binary magnetic nanostructures made from one or two ferromagnetic materials (Ni and Ni 80 Fe 20 ) is reported using self‐aligned shadow deposition technique. The static and dynamic properties are characterized using magneto‐optical Kerr effects (MOKE) and broadband ferromagnetic resonance spectroscopy. Compared with Ni 80 Fe 20 nanomagnets made using a conventional lithographic technique from identical resist templates, tunable magnetization switching is observed with a marked increase in the coercive field and more adjustable dynamic response for the Ni 80 Fe 20 /Ni 80 Fe 20 and Ni/Ni 80 Fe 20 binary structures. The results are validated by direct domain imaging using magnetic force microscopy and micromagnetic simulations.