Studies on Magnetization Reversal in 2-dimensional Spin Photonic Crystals of Cobalt Anti-dot Arrays

摘要

Cobalt anti-dot square-lattice arrays of different periodicities were fabricated using the photolithography and wet-etching process. The dimensions of these 2-dimensional spin photonic crystals were checked by using scanning electron microscopy and atomic force microscopy whereas the magnetic properties were studied using the magnetooptical Kerr effect (MOKE) and magnetic force microscopy (MFM). The in-plane azimuthal MOKE measurements showed uniaxial two-fold anisotropy with the hard and the easy axes along the nearest neighbor rows/columns and the diagonal making an angle of 45? with respect to the nearest neighbor row/column, respectively. The coercive field was strongly influenced by changes in the lattice periodicity. The remanent state revealed well-defined domain structures, which varied periodically with the lattice geometry as was clearly seen from the MFM imaging. To elucidate the domain configuration, we also performed micromagnetic simulations and the results are presented in this report.