FePt:SiO 2 granular thin film for high density magnetic recording

Abstract

Nanocomposite FePt:SiO2 thin films consisting of high anisotropy FePt particles embedded in a SiO2 matrix have been successfully fabricated by annealing the as-deposited FePt/SiO2 multilayers. By adjusting the annealing temperatures and compositions, films were obtained with coercivity of 3.8 kOe and grain size of 10 nm, which are suitable for high-density magnetic recording. Magnetic activation volumes were measured and thermal stability is discussed.

Effects of rapid thermal annealing on nanostructure, texture and magnetic properties of granular FePt:Ag films for perpendicular recording (invited)

“…In order to overcome the thermal instability and continue the growth of the areal density, recent studies have been focused on high anisotropy, L1 0 phased FePt and CoPt alloy thin films. [3][4][5] Usually, a heated substrate or a post-thermal annealing is needed for obtaining the ordered structure. However, one of the side effects of annealing is relatively high processing temperature, which may adversely affect grain growth.…”

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

“…However, the annealing also results in particle aggregation, leading to wide size distributions. To control the size and narrow the size distribution, FePt nanoparticles prepared from vacuum-deposition methods are often buried in a variety of insulator matrices, such as SiO 2 , [16] Al 2 O 3 , [17] B 2 O 3 , [18] or Si 3 N 4 . [19] Alternatively, FePt particles can be made by gas-phase evaporation.…”

Space‐Confined Formation of FePt Nanoparticles in Ordered Mesoporous Silica SBA‐15

“…[4] Several methods were developed for the preparation of FePt nanoparticles [5,6] such as physical deposition processes on a support, [7][8][9] gas phase sintering techniques, [10] liquid phase polyol assisted synthesis [11,12] or in situ formation of FePt particles from precursors trapped in an inorganic matrix. [13] Significant efforts were made improving the polyol synthesis procedure [13][14][15] and using core-shell approaches.…”