Structural and magnetic properties of FePt:SiO2 granular thin films

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Abstract
Nanocomposite FePt:SiO 2 films have been fabricated by annealing the as-deposited FePt/SiO 2 multilayers at temperatures from 450 to 650 °C. These films consist of high-anisotropy tetragonal L1 0 FePt particles embedded in a SiO 2 matrix. The structural and magnetic properties of these films were investigated. We have found that coercivity and grain size are highly dependent on the annealing temperature and SiO 2 concentration. Films with coercivities in the range from 2 to 8 kOe and grain sizes of 10 nm or less were obtained. These films have considerable potential as high-density magnetic recording media.