Characterization and Magnetic Properties of Iron-Based Alloy Antidot Arrays

Fe₂₉Co₇₁ and Fe₁₉Ni₈₁ antidot arrays, with different dimensions, are prepared with the rf magnetron sputtering method onto the porous alumina substrate. The size and shape of antidot arrays are characterized by scanning electron microscopy. The glancing angle x-ray diffraction patterns of Fe₂₉Co₇₁ and Fe₁₉Ni₈₁ antidot arrays indicate the bcc and fcc structures, respectively. The coercivities of both the alloys show abnormal thickness dependence, which are discussed qualitatively by considering the pinning and the thickness effect to the films.