In situ external magnetic field was applied during the synthesis of FePt nanoparticles via a chemical solution method. FePt nanoparticle films were prepared on Si by a drop-coating method with and without a magnetic field. Annealing at 700 °C in reductive atmosphere was explored to obtain ferromagnetic FePt L10 phase. The effect of in situ-applied magnetic field on the structure, morphology, an...

Iron-platinum alloy nanoparticles (FePt NPs) are extremely promising candidates for the next generation of contrast agents for magnetic resonance (MR) diagnostic imaging and MR-guided interventions, including hyperthermic ablation of solid cancers. FePt has high Curie temperature, saturation magnetic moment, magneto-crystalline anisotropy, and chemical stability. We describe the synthesis and c...

Nanoparticles (NPs) are advantageous for the delivery of diagnosis agents to brain tumors. In this study, we attempted to develop an L-cysteine coated FePt (FePt-Cys) NP as MRI/CT imaging contrast agent for the diagnosis of malignant gliomas. FePt-Cys NPs were synthesized through a co-reduction route, which was characterized by transmission electron microscopy, high-resolution transmission elec...

FePt magnetic thin films (20 nm) were deposited on SrTiO3 (1 0 0) single-crystal substrates at 150, 250, and 350 1C by DC magnetron sputtering. The dependence of the structural and magnetic properties of the FePt films on the substrate temperature was studied. At 150 1C, the FePt film showed a (1 1 1) preferred orientation. At 250 1C, the superlattice FePt (0 0 1) peak appeared indicating that ...

By co-sputtering Cu and FePt onto Cr90Mo10 underlayers, the preferred orientation and easy axis of magnetic anisotropy of FePt films were successfully changed from the perpendicular to the in-plane direction. The pure FePt film grown on the Cr90Mo10 underlayer showed a (001) preferred orientation with out-of-plane magnetic anisotropy. As 20 and 40 vol.% Cu were doped, the FePt films showed a (2...

In this work, we present an experimental technique for obtaining highly ordered L1 FePt-oxide thin film media at moderate deposition temperatures. In most previous studies, a FePt-Oxide layer is directly deposited on a (001) textured MgO layer. By introducing a buffer layer in between the FePt-oxide layer and the MgO underlayer, we are able to substantially enhance the L1 ordering of the FePt-o...

Monodisperse FePt nanocubes are synthesized at 205 degrees C by controlling decomposition of Fe(CO)5 and reduction of Pt(acac)2 and addition sequence of oleic acid and oleylamine. Different from the assembly of the sphere-like FePt nanoparticles, which shows 3D random structure orientation, self-assembly of the FePt nanocubes leads to a superlattice array with each FePt cube exhibiting (100) te...

The influence of Cu, Ag, and Au additives on the L10 ordering, texture, and grain size of FePt thin films has been examined. Lattice parameter data indicated that Au and Ag additives tended to segregate from FePt, but Cu alloyed with FePt. FePt films with Au or Ag additive showed 1–2 kOe higher coercivity values compared to a pure FePt film after annealing at 450 °C and above for 10 min. The ad...

Among many kinds of magnetic materials, L10-phase FePt shows almost the highest magnetic anisotropy resulting in high coercivity [1]. Thus, FePt has been intensively studied as material for magnetic recording media with a storage capacity of Tbit/in [2]. After the IBM group reported the synthesis of FePt nanoparticles (NPs) in liquid phase using iron pentacarbonyl [Fe(CO)5] and platinum(II) ace...

The crystallographic orientation and easy axis of magnetic anisotropy in L10 FePt films were successfully modulated with Cu buffer layers. The FePt film directly grown on the Cr90Mo10 underlayer showed a (001) preferred orientation with out-of-plane magnetic anisotropy. As the Cu buffer layer thickness was z4 nm, the FePt films showed a (110) preferred orientation with in-plane magnetic anisotr...