Self-assembled strontium ferrite on Au nano-dot arrays using rapid thermal annealing

Abstract

The self-assembled SrM dot array on Au nano-dots has been prepared by using DC magnetron sputtering system without any substrate heating. Then, flash annealing was carried out to crystallize the SrM film. C-axis oriented SrM perpendicular to the films can be observed only at annealing temperature of 800°C for annealing time of 7 min. The coercivity and remanent squareness ratio in perpendicular direction are 2.8 kOe and 0.72, respectively. The reversal magnetization of SrM on patterned Au nano-dots is closer the Stoner-Wohlfarth model compared to continuous films. The peak of ΔM of SrM film deposited on patterned Au nano-dots is lower compared to SrM deposited on continued Au films.