Large coercivity and granular structure of CoPt/SiO/sub 2/ films

Effects of annealing on the magnetic and structural properties of FePt nanoparticles prepared by chemical synthesis

“…On the other hand, FG reduces iron that exists in an oxidized state in the particles and leads to an improvement of the chemical ordering and coercivity [9,10]. This result is consistent with previous studies reported by Yu et al [5] and Platt et al [11,12]. TEM images of annealed samples are shown in Fig.…”

Synthesis and structure of isolated L1/sub 0/ FePt particles

“…As the ratio of 873K annealed a-Al O /Fe/Pt films with relative Fe composition close to 50 at.% was found to be in the range of 0.97-0.98, so the ordered L FePt phase was the reason for the high magnetic coercivity. The ratio was reported in CoPt granular films with large coercivity and it was claimed that highly ordered tetragonal structure is a prerequisite for the large coercivity [8]. Gong et al reported that the coercivity of FePt films was greatly dependent on composition and the highest coercivity was obtained around 53 at.% of Fe [9].…”

Fabrication of two-dimensional assembly of L1FePt nanoparticles

“…The reason is that to attain the ordered phase of the alloy very high-temperature treatment ͑550-650°C͒ is indispensable and no practical process has been developed to cope with the compatibility between the nanoparticle structure and the high anisotropy of the ordered L1 0 phase. On the other hand, a few studies aiming to reduce the ordering temperature have been reported 3,4 Luo and Sellmyer reported that the ordering process of Fe/Pt multilayers occurs in the appreciably reduced temperature range of 300-400°C. 4 In this article, the ordering process of double or quadruple layers of Fe/Pt is studied.…”