Preparation and Magnetic Properties of FePt Nanodot Arrays Sputtering on AAO Templates

摘要

FePt nanodot arrays are the promising recording media for future super-high density magnetic recording because of their huge uniaxial magneto-crystalline anisotropy and good signal noise ratio. In this article, FePt nanodot arrays were successfully prepared on anodic aluminum oxide (AAO) templates by magnetron sputtering, and an Ag underlayer was proposed to improve the magnetic properties of FePt nanodot arrays. The dependences of Ag underlayer, annealing temperature, and pore diameter on the magnetic properties of FePt nanodot arrays were investigated. Using the AAO templates with pore diameter of 80nm and annealing temperature of 600 degrees C, the coercivity of Ag/FePt nanodot arrays is improved significantly to 10262Oe.