Abstract
A planar dot pattern was fabricated using the flat-patterning method involving nanoscale composition control. A small percentage of Fe and Pt atoms was locally diffused into an L1 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> FePtRh film by annealing, resulting in ferromagnetic dots with a diameter of 50 nm and a nonmagnetic spacing with a width of 100 nm. Nanoscale composition profiles around the dots were analyzed by an energy dispersive X-ray detector attached to a transmission electron microscope. Only the area in which the composition crossed the ferromagnetic-nonmagnetic threshold underwent a magnetic phase change. Magnetic force microscopy revealed ferromagnetic dots with a single-domain structure in the nonmagnetic matrix.
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