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

Abstract

Isolated FePt particles were fabricated by taking advantage of overgrowth of Fe on Pt particles and subsequent annealing at 873K. The annealing lead to the formation of ordered tetragonal (L1 0 ) FePt particles with three orthogonal variants. The average size of FePt particles could be adjusted to less than 10 nm and no significant grain coarsening occurred upon annealing due to the existence of an amorphous Al 2 O 3 layer. Nano-beam electron diffraction revealed that the lattice constant ratio was approximately 0.97 for the annealed FePt particles with Fe composition close to 50 at.%.

Intrinsic and hysteresis properties of FePt nanoparticles

“…The FePt system is well established as having exceptional properties in the bulk, 9 and has been extensively studied in thin film form. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The system has been studied as single layers [20][21][22] and multilayers with bilayers constituents of Ag, 11,12,19,23,25 C, 10,11,15,24 BN, 10 SiO 2 , 13 and Al 2 O 3 . 19 These properties coupled with the fact that the alloys are highly oxidation resistant make them ideal candidates for future magnetic recording media.…”

Nanostructured L1<SUB>0</SUB> Fe-Pt Based Thin Films for Perpendicular Magnetic Recording

“…Besides, extra streaks in the diffraction pattern suggest {111} twins. 18,19) As seen in the cross-sectional image, (b), the Fe-Pt layer was found to have very clear defect lines which inclined to the film normal. The angle between the defect lines and (001) plane parallel to the substrate is around 55 .…”

Magnetic Nanoparticles and Their Applications

“…[256][257][258][259][260][261][262][263][264][265][266][267][268][269][270] This would correspond to a single-particle-per-bit density of 6.6 Tbits/in 2 . Numerous groups have investigated gas-phase high-vacuum methods to grow FePt nanoparticles, [271][272][273] but these do not have the same degree of monodispersity and do not self-assemble into arrays. Monodisperse particles have been grown in a cluster beam, and show short range ordering when deposited on a surfactant-coated surface.…”